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• Page 1: Digital Multimeter

  ® 8808A Digital Multimeter Users Manual July 2007, Rev. 1, 12/09 © 2007, 2009 Fluke Corporation, All rights reserved. Specifications subject to change without notice. All product names are trademarks of their respective companies.

• Page 2
  Fluke authorized resellers shall extend this warranty on new and unused products to end-user customers only but have no authority to extend a greater or different warranty on behalf of Fluke. Warranty support is available only if product is purchased through a Fluke authorized sales outlet or Buyer has paid the applicable international price.

• Page 3: Table Of Contents

  Resistance …………………. 1-11 DC Current ………………..1-11 AC Current ………………..1-12 Frequency …………………. 1-13 Continuity …………………. 1-13 Diode Test ………………… 1-13 Preparing the Meter for Operation …………. 2-1 Introduction………………….2-3 Unpacking and Inspecting the Meter …………..2-3 Contacting Fluke………………..2-3…

• Page 4
  Turning Power On ………………… 2-8 Adjusting the Bail ………………..2-8 Installing the Meter into an Equipment Rack ………… 2-8 Cleaning the Meter………………… 2-9 Fluke 45 Emulation……………….. 2-9 Illuminating All Display Segments…………..2-10 Operating the Meter from the Front Panel ……..3-1 Introduction………………….3-3 Dual Display ………………….
• Page 5
  (continued) Contents Local and Remote Operations …………… 4-3 Computer Interfaces ………………4-3 Preparing the Meter for Operations via the RS-232 Interface ……4-3 Setting Communication Parameters (RS-232) ……….4-3 RS-232 Print-Only Mode …………….4-4 Cabling the Meter to a Host or Printer (RS-232)……….. 4-5 Character Echoing and Deletion…………..
• Page 6
  8808A Users Manual…
• Page 7
  Safety and Electrical Symbols…………….1-6 1-3. Accessories………………….1-7 2-1. Line Voltage to Fuse Rating………………. 2-4 2-2. Line-Power Cord Types Available from Fluke…………2-7 3-1. Front-Panel Features ………………..3-4 3-2. Display Annunciators and Indicators …………..3-7 3-3. Rear-Panel Features ………………..3-8 3-4.
• Page 8
  8808A Users Manual…
• Page 9
  Title Page 2-1. Replacing the Line Power Fuse…………….2-5 2-2. Replacing the Current-Input Fuses…………….. 2-6 2-3. Line-Power Cord Types Available from Fluke…………2-7 2-4. Bail Adjustment and Removal …………….2-8 2-5. Boot Removal………………….2-9 3-1. Front Panel ………………….3-4 3-2.
• Page 10
  8808A Users Manual viii…

• Page 11: Introduction And Specifications

  Chapter 1 Introduction and Specifications Title Page Introduction………………….1-3 Manual Set ………………….1-3 About this Manual ………………..1-4 Safety Information ………………..1-4 General Safety Summary…………….. 1-4 Symbols ………………….1-6 Options and Accessories ………………1-7 General Specifications ………………1-8 Voltage ………………….1-8 Dimensions ………………….

• Page 12
  8808A Users Manual…

• Page 13: Introduction

  Introduction and Specifications Introduction Introduction The Fluke 8808A Digital Multimeter (hereafter referred to as the Meter) is a 5-1/2 digit dual-display multimeter designed for bench-top, field service, and system applications. The multiple measurement functions, plus the RS-232 remote interface, make the Meter an ideal candidate for precision manual measurements and use in automated systems.

• Page 14: About This Manual

  8808A Users Manual About this Manual This manual contains all the information a new user will need to operate the Meter effectively. This manual is divided into the following chapters: Chapter 1, “Introduction and Specifications,” provides information on how safely to use the Meter, and standard and optional accessories and specifications.

• Page 15
  Introduction and Specifications Safety Information Table 1-1. Safety Information XW Warning To avoid possible electric shock, personal injury, or death, read the following before using the Meter: Use the Meter only as specified in this manual, or the protection provided by the Meter might be impaired.

• Page 16: Symbols

  Recycle Do not dispose of this product as Static awareness. Static discharge unsorted municipal waste. Contact can damage parts. Fluke or a qualified recycler for disposal. Measurement Category II is for Measurement Category I is for measurements performed on CAT II…

• Page 17: Options And Accessories

  Introduction and Specifications Options and Accessories Options and Accessories Table 1-3 lists available options and accessories. Table 1-3. Accessories Item Model / Part Number Premium Test Lead Set TL71 Fuse, .25*1.25, 0.063 A, 250 V, Slow 163030 Fuse, .25*1.25, 0.125 A, 250 V, Slow 166488 F1 — Fuse, 11 A, 1000 V, Fast, 406INX1.5IN, BULK 803293…

• Page 18: General Specifications

  8808A Users Manual General Specifications Voltage 100V Setting …………90 V to 110 V 120V Setting …………. 108 V to 132 V 220V Setting …………. 198 V to 242 V 240V Setting …………. 216 V to 264 V Frequency…………47 Hz to 440 Hz Power Consumption ………

• Page 19: Remote Interfaces

  Introduction and Specifications Electrical Specifications Overrange …………10 % on the largest ranges of all functions except continuity and diode test Remote Interfaces RS-232C Warranty One year Electrical Specifications Specifications are valid for 5-½ digit mode and after at least a half-hour warm-up. DC Voltage Specifications Maximum Input ……….

• Page 20: Ac Voltage Specifications

  8808A Users Manual AC Voltage Specifications AC Voltage specifications are for ac sinewave signals >5 % of range. For inputs from 1 % to 5 % of range and <50 kHz, add an additional error of 0.1 % of range, and for 50 kHz to 100 kHz, add 0.13 % of range. Maximum Input ……….

• Page 21: Resistance

  Introduction and Specifications Electrical Specifications Resistance Specifications are for 4-wire resistance function, or 2-wire resistance with REL. If REL is not used, add 0.2 for 2-wire resistance plus lead resistance. Measurement Method ……..Current source referenced to LO input Max Lead Resistance (4-wire ohms) ….10 % of range per lead for 200 , 2 k ranges. 1 k per lead on all other ranges.

• Page 22: Ac Current

  8808A Users Manual Accuracy Uncertainty Temperature Coefficient/ C Range 90 days 1 year Outside 18 – 28 C 23 C 23 C 200 A 0.02 + 0.005 0.03 + 0.005 0.003 + 0.001 2 mA 0.015 + 0.005 0.02 + 0.005 0.002 + 0.001 20 mA 0.03 + 0.02…

• Page 23: Frequency

  Introduction and Specifications Electrical Specifications Frequency Gate Time …………131 ms Measurement Method ……..AC-coupled input using the ac voltage measurement function. Settling Considerations ……..When measuring frequency after a dc offset voltage change, errors may occur. For the most accurate measurement, wait up to 1 second to allow input blocking RC time constant to settle.

• Page 24
  8808A Users Manual 1-14…

• Page 25: Preparing The Meter For Operation

  Current-Input Fuses………………. 2-5 Connecting to Line Power …………….. 2-7 Turning Power On ………………… 2-8 Adjusting the Bail ………………..2-8 Installing the Meter into an Equipment Rack ………… 2-8 Cleaning the Meter………………… 2-9 Fluke 45 Emulation……………….. 2-9 Illuminating All Display Segments…………..2-10…

• Page 26
  8808A Users Manual…

• Page 27: Introduction

  Fluke immediately. Save the container and packing material in case you have to return the Meter. Contacting Fluke To order accessories, receive operating assistance, or get the location of the nearest Fluke distributor or Service Center, call: USA:…

• Page 28: Selecting The Line Voltage

  8808A Users Manual Selecting the Line Voltage The Meter operates on four different input line voltages. The selected line-voltage setting is visible through the window in the line-fuse holder on the Meter’s rear panel. 1. Unplug the power cord. 2. Insert a small screwdriver blade into the narrow recess to the left of the fuse holder and pry it to the right until the holder pops out.

• Page 29: Current-Input Fuses

  Preparing the Meter for Operation Power Considerations eue20.eps Figure 2-1. Replacing the Line Power Fuse Current-Input Fuses The 200 mA and 10 A inputs are protected by user-replaceable fuses. The 200 mA input is protected by a fuse (F2) rated at 440 mA, 1000 V (fast blow), 10,000 A minimum breaking capacity.

• Page 30
  8808A Users Manual To replace the current-input fuses: 1. Remove power from the Meter by unplugging its power cord. 2. Turn the Meter upside down. 3. Remove the retaining screw on the fuse access door located on the bottom of the Meter.

• Page 31: Connecting To Line Power

  2. Verify that the correct fuse for the line voltage is installed. 3. Connect the power cord to a properly grounded three-prong outlet. See Figure 2- 3 for line-power cord types available from Fluke. Refer to Table 2-2 for descriptions of the line-power cords.

• Page 32: Turning Power On

  8808A Users Manual Turning Power On 1. If required, connect the Meter to line power. 2. Toggle the power switch on the rear panel so the “I” side of the switch is depressed. The Meter will turn on and briefly illuminate all LCD segments. Note To save on power consumption, the Meter can be set to a standby mode by pressing P on the front panel.

• Page 33: Cleaning The Meter

  Do not use aromatic hydrocarbons, alcohol, chlorinated solvents, or methanol-based fluids when wiping down the Meter. Fluke 45 Emulation To switch the Meter to Fluke 45 emulation: Press and hold S and f for two seconds.

• Page 34: Illuminating All Display Segments

  8808A Users Manual Press U or V to scroll between F8808A and F45. The presently selected mode will appear bright in the display, while the other is dim. Press R to set the mode and reset the Meter. Illuminating All Display Segments To illuminate all display segments, start with the Meter display off.

• Page 35: Operating The Meter From The Front Panel

  Chapter 3 Operating the Meter from the Front Panel Title Page Introduction………………….3-3 Dual Display …………………. 3-6 Primary Display………………… 3-6 Secondary Display………………3-6 Rear Panel ………………….3-8 Adjusting Meter Range ………………3-8 Selecting a Measurement Rate…………….3-9 Selecting a Measurement Function…………..3-9 Measuring Voltage ………………

• Page 36
  8808A Users Manual…

• Page 37: Introduction

  Operating the Meter from the Front Panel Introduction Introduction The Meter can be controlled either by sending commands through its RS232 communication interface or through the front panel. This chapter explains the function and use of the controls and indicators located on the front panel of the Meter. Operating the Meter through its RS232 communication interface is covered in Chapter 4.

• Page 38
  8808A Users Manual 8808A 5-1/2 DIGIT MULTIMETER INPUT SENSE 2W/4W 1000 V CAT I 1000V 300V 600 V CAT II 750V 500 V pk 200 mA 10 A eue02.eps Figure 3-1. Front Panel Table 3-1. Front-Panel Features Name Description INPUT VZYR HI, LO Input terminals for Volts, 2-Wire and 4-Wire Ohms, and Hz measurements.
• Page 39
  Operating the Meter from the Front Panel Introduction Table 3-1. Front-Panel Features (cont.) Name Description Primary operation: Sets the Meter’s measurement rate to slow, medium or fast Second level operation: Selects source for triggering measurement Primary operation: Selects Touch Hold function Second level operation: Sets Touch Hold minimum response level Primary operation: Selects relative readings function to display…

• Page 40: Dual Display

  8808A Users Manual Dual Display The Meter has a 5-1/2 digit vacuum fluorescent dual display. See Figure 3-2 and Table 3- 2 for an overview of the display annunciators and indicators The dual display is comprised of a primary display and a secondary display, which show measurement readings, annunciators and messages.

• Page 41
  Operating the Meter from the Front Panel Table 3-2. Display Annunciators and Indicators Name Description Meter is in remote mode (remotely controlled) the front panel is locked out Ext Trig Meter is in external trigger mode is pressed and secondary function will be selected Relative readings function modifier is selected –…

• Page 42: Rear Panel

  8808A Users Manual Rear Panel See Figure 3-3 and Table 3-3 for an overview of the rear-panel features. eue03.eps Figure 3-3. Rear Panel Table 3-3. Rear-Panel Features Name Description Line power terminal Connects Meter to power source via power cord Power switch Turns power on and off to the Meter Fuse holder and power line voltage…

• Page 43: Selecting A Measurement Rate

  Operating the Meter from the Front Panel Selecting a Measurement Rate In autoranging mode, the Meter automatically selects the next higher range when a reading is greater than full-scale. If no higher range is available, 0L is displayed on the primary or secondary display to indicate an overload.

• Page 44: Measuring Voltage

  8808A Users Manual Measuring Voltage The Meter is capable of measuring voltage up to 1000 V dc and 750 V ac. W Caution To avoid possible damage to the Meter, do not apply voltage to the Meter’s inputs until the test leads are properly connected and the proper voltage function is selected.

• Page 45: Frequency Ranging

  Operating the Meter from the Front Panel Selecting a Measurement Function Frequency Ranging Frequency measurements are automatically ranged so that a frequency measurement is always displayed with maximum resolution. To select a range manually, press F to select the frequency function, and then press U or V to select a range manually.

• Page 46: 4-Wire Resistance Measurement

  10 A eue12.eps Figure 3-6. 4-Wire Resistance Measurement To make a four-wire resistance measurement using Fluke’s 2X4 test leads: 1. Connect the test leads to the Meter’s input connectors as show in Figure 3-7. 2. Press N. 2*4 Wire is displayed.

• Page 47: Measuring Current

  Operating the Meter from the Front Panel Selecting a Measurement Function INPUT SENSE 2W/4W 1000 V CAT I 1000V 300V 600 V CAT II 750V 500 V pk 200 mA 10 A Ground tab eue26.eps Figure 3-7. Input Connections for 4-Wire Ohms Using 2×4 Wire Leads Measuring Current W Caution To avoid blowing the current fuse or damaging the Meter, do…

• Page 48: Automatic Input Terminal Detection

  8808A Users Manual I < 200 mA INPUT SENSE 2W/4W 1000 V CAT I 1000V 300V 750V 600 V CAT II 500 V pk 200 mA 10 A V AC eue13.eps Figure 3-8. Current Measurement <200 mA I > 200 mA INPUT SENSE I <…

• Page 49: Diode / Continuity Testing

  Operating the Meter from the Front Panel Selecting a Measurement Function Diode / Continuity Testing Press G to toggle between the continuity and diode test functions for the primary display. (These functions cannot be selected for the secondary display.) To perform a continuity test: 1.

• Page 50: Making A Triggered Measurement

  8808A Users Manual INPUT SENSE 2W/4W 1000 V CAT I 1000V 300V 600 V CAT II 750V 500 V pk 200 mA 10 A eue16.eps Figure 3-11. Diode Test Making a Triggered Measurement The Meter features a trigger function that allows you to select a measurement trigger source.

• Page 51: Selecting A Function Modifier

  Operating the Meter from the Front Panel Selecting a Function Modifier An external TTL signal on pin 9 will trigger a measurement cycle. Alternatively, pin 9 of the RS-232 interface can be connected to pin 1 through an external switch. See Figure 3- 12.

• Page 52: Relative Readings Modifier (Rel)

  8808A Users Manual After a function modifier is selected, pressing any function button turns off all modifiers, causes the secondary display to go blank, and returns unmodified readings to the primary display. Relative Readings Modifier (REL) The relative readings modifier displays the difference between the relative base and the input measurement.

• Page 53: Touch Hold Function (Hold)

  Operating the Meter from the Front Panel Selecting a Function Modifier Table 3-5. dBM Reference Impedances Impedance Impedance Impedance 8000 1200 1000 Voltage annunciator lit Audio power readings possible To access the reference impedance list, press Q then press W. The reference impedance currently selected is displayed, along with the «db»…

• Page 54: Minimum / Maximum Modifier (Min Max)

  8808A Users Manual Level 1 (5 % of range) Level 2 (7 % of range) Level 3 (8 % of range) To change the response level, press Q and I. The response level currently selected (1, 2, 3 or 4) appears on the primary display. Press U or V to step to the desired response level, then press R for two seconds to set the level and return to the primary display.

• Page 55: Using The Function Modifiers In Combination

  Operating the Meter from the Front Panel Selecting a Function Modifier Using the Function Modifiers in Combination You can use multiple function modifiers simultaneously. Selected modifiers are evaluated in the following order: Touch Hold, minimum/maximum, and then relative readings. The Meter first looks for a stable measurement for Touch Hold, then determines if the measurement is a new minimum or maximum value, and then subtracts the relative base from the measurement.

• Page 56: Compare Function (Comp)

  8808A Users Manual Table 3-6. Second Level Operations (cont.) Buttons Description In COMP mode, stores value on primary display as LO compare point (see the “Using the Compare Function” section later in this manual) In COMP mode, stores value on primary display as HI compare point (see “Using the Compare Function”) [1] Hold both buttons for 2 seconds.

• Page 57: Using The List Editor

  Operating the Meter from the Front Panel List and Number Editors Using the List Editor The list editor is used to select the options described in Table 3-7. You may abort an edit and return to normal operation at any time by pressing Q. To use the list editor: 1.

• Page 58: Using The Number Editor

  8808A Users Manual Using the Number Editor Use the number editor to edit the relative base for the relative readings modifier and to set the high and low threshold values for the compare function. Note that you can abort the number editor and return the Meter to normal operation by pressing Q.

• Page 59: Power-Up Configuration

  Operating the Meter from the Front Panel Power-Up Configuration Range mode on primary display (manual or autorange) Measurement rate (slow, medium, fast) Dual display status (active or inactive) Any combination of selected function modifiers Touch Hold level (1, 2, 3, 4) Last recorded minimum and maximum values for MINMAX modifier Last recorded relative base Relative base shown in secondary display (enabled or disabled)

• Page 60
  8808A Users Manual 3-26…

• Page 61: Operating The Meter Using The Computer Interface

  Chapter 4 Operating the Meter Using the Computer Interface Title Page Introduction………………….4-3 Local and Remote Operations …………… 4-3 Computer Interfaces ………………4-3 Preparing the Meter for Operations via the RS-232 Interface ……4-3 Setting Communication Parameters (RS-232) ……….4-3 RS-232 Print-Only Mode …………….

• Page 62
  8808A Users Manual Compare Commands and Queries …………..4-24 Trigger Configuration Commands…………..4-24 Miscellaneous Commands and Queries…………4-25 RS-232 Remote / Local Configurations …………4-25 RS-232 Save / Recall System Configurations ……….4-26 Sample Program Using the RS-232 Computer Interface ……..4-27…

• Page 63: Introduction

  Operating the Meter Using the Computer Interface Introduction Introduction This chapter describes how to set up, configure and operate the Meter via the RS-232 computer interface on the Meter’s rear panel. The Meter can be operated from a host (a terminal, controller, PC, or computer) by sending commands to the Meter through its computer interface.

• Page 64: Rs-232 Print-Only Mode

  RS-232 Print-Only Mode The print-only mode is used to send measurements to a printer or terminal automatically. While the Meter will respond to remote commands during print-only operations, Fluke recommends first setting the Meter’s echo mode to OFF. This prevents mixing echoed command characters and incoming data.

• Page 65: Cabling The Meter To A Host Or Printer (Rs-232)

  Longer cables can be used if the load capacitance at the interface point (including signal terminator) is less than 2500 pf. To connect the Meter to a personal computer (with DB-9 connector), use a Fluke RS43 Null modem cable. Refer to Table 1-3.

• Page 66: Character Echoing And Deletion

  4. Type *IDN? and press Enter. 5. Verify that the Meter sends the following response: FLUKE, 8808A, nnnnnnn, n.n Dn.n Where nnnnnnn is the Meter’s serial number; n.n is the main software version; and Dn.n is the display’s software version.

• Page 67: If Test Fails

  Operating the Meter Using the Computer Interface How the Meter Processes Input If Test Fails If the Meter does not respond as indicated in the “Installation Test for RS-232 Operation” section, perform the following: 1. Ensure all cables are properly connected. See the “Cabling the Meter to a Host or Printer (RS-232)”…

• Page 68: Sending Numeric Values To The Meter

  8808A Users Manual Sending Numeric Values to the Meter Numeric values can be sent to the Meter as integers, real numbers, or real numbers with exponents, as shown in the following examples: +12345689 Sends the signed integer “12345689” -1.2345E2 Sends “-1.2345E2” or “-123.45” Sending Command Strings to the Meter Observe the following rules when you construct strings to be sent to the Meter over the computer interface:…

• Page 69: Triggering Output

  Operating the Meter Using the Computer Interface Triggering Output +/- 1.0E+9 Overload (0L on the display) Triggering Output The Meter takes measurements when triggered to do so. There are five trigger types, which are described in Table 4-3. Triggers fall into two basic categories: Internal trigger, which triggers measurements continuously.

• Page 70: Setting The Trigger Type Configuration

  8808A Users Manual Note In external trigger mode (mode 2 to mode 5), *TRG command is always available. Setting the Trigger Type Configuration To set the trigger type configuration using the computer interface, enter the command TRIGGER <type> (where <type> is the trigger type) and press Enter. See Table 4-3 for trigger types.

• Page 71: Status Registers

  Operating the Meter Using the Computer Interface Status Registers Status Registers The contents of the status register (STB) are determined by the service enable register (SRE), event status register (ESR), event status enable register (ESE), and the output buffer. These status registers are explained in the following paragraphs and summarized in Table 4-5.

• Page 72: Event Status And Event Status Enable Registers

  8808A Users Manual Standard Event Status Register Read Using *ESR? & & & & & & & Queue & Not-Empty Standard Event Status Enable Register Read Using *ESE? Write to Using *ESE Output Queue Read by Serial Poll Service Status Byte Register ESB MAV Request Generation…

• Page 73
  Operating the Meter Using the Computer Interface Status Registers When any enabled bit in the ESR changes from 0 to 1, the ESB bit in the STB also changes to 1. When the ESR is read using the *ESR? command or cleared using the *CLS command, the ESB bit in the STB returns to 0.

• Page 74: Status Byte Register

  8808A Users Manual Table 4-6. Description of Bits in ESR and ESE Bit No. Name Condition Operation Complete (OPC) All commands before receipt of an *OPC command have been executed. Interface is ready to accept another message. Not used Always set to 0. Query Error (QYE) Attempted to read data from the Meter’s output buffer when no output was present or pending.

• Page 75: Reading The Status Byte Register

  Operating the Meter Using the Computer Interface Computer Interface Command Set Table 4-7. Description of Bits in the Status Byte Register (STB) (cont.) Bit No. Name Condition Master Summary Status (MSS) Set to 1 if any enabled bit in the STB (MSS) register is set to 1;…

• Page 76: Common Commands

  (1 or 0) of bits in the register. *IDN? Identification Query Meter returns the identification code of the Meter as four fields separated by commas. These fields are: Manufacturer (FLUKE); model (8808A); seven-digit serial number; and versions of main software and display software. *OPC Operation Complete…

• Page 77: Function Commands And Queries

  Operating the Meter Using the Computer Interface Computer Interface Command Set Table 4-8. Common Commands (cont.) Command Name Description *SRE Service Request Enable Sets the Service Request Enable Register to <value>, where <value> is an integer between 0 and 255. The value of bit 6 is ignored because the Service Request Enable Register does not use it.

• Page 78
  8808A Users Manual Table 4-9. Function Commands and Queries (cont.) Commands Function Primary Display Secondary Display FUNC1? (Not applicable) Meter returns function selected as command mnemonic. For example, if frequency is selected, FUNC1? returns FREQ. (Not applicable) FUNC2? Meter returns function selected as command mnemonic.

• Page 79: Function Modifier Commands And Queries

  Operating the Meter Using the Computer Interface Computer Interface Command Set Function Modifier Commands and Queries Table 4-10 describes function modifier commands and queries. A function modifier causes the Meter to modify the normal operation of a measurement function or to perform an action on a measurement before displaying a reading.

• Page 80
  8808A Users Manual Table 4-10. Function Modifier Commands and Queries (cont.) Command Description HOLDTHRESH? Meter returns Touch Hold <threshold> (1, 2, 3, or 4). See “Touch Hold Function (HOLD)” in Chapter 3 for more information. Meter enters MAX modifier with present reading as maximum value. If already in MAX modifier, Meter displays maximum value.

• Page 81: Range And Measurement Rate Commands And Queries

  Operating the Meter Using the Computer Interface Computer Interface Command Set Table 4-10. Function Modifier Commands and Queries (cont.) Command Description MOD? Meter returns a numeric value indicating modifiers in use, where 1 = MIN; 2 = MAX; 4 = HOLD; 8 = dB; 16 = dB Power; 32 = REL; and 64 = COMP. If multiple modifiers are selected, the value returned is equal to the sum of the values of the selected modifiers.

• Page 82
  8808A Users Manual Table 4-11. Range and Measurement Rate Commands and Queries (cont.) Command Description RANGE <value range> Sets the primary display to <value range> where <value range> is the number in the Range Value column of Table 4-11A that corresponds with the applicable function ranges (voltage, ohms, current, etc.).

• Page 83: Measurement Queries

  Operating the Meter Using the Computer Interface Computer Interface Command Set Measurement Queries Table 4-12 describes measurement queries, which are shown on the primary and/or secondary displays. Table 4-12. Measurement Queries Command Description MEAS1? Meter returns the value shown on the primary display after the next triggered measurement is completed.

• Page 84: Compare Commands And Queries

  8808A Users Manual Compare Commands and Queries Table 4-13 describes the compare commands and queries. These commands cause the Meter to determine whether a measurement is higher than, lower than, or within a specified range. These commands correspond with C, U and V on the front panel.

• Page 85: Miscellaneous Commands And Queries

  Operating the Meter Using the Computer Interface Computer Interface Command Set Miscellaneous Commands and Queries Table 4-15 describes miscellaneous commands and queries. Table 4-15. Miscellaneous Commands and Queries Command Description ^C (CONTRL C) Causes =><CR><LF> to be output. FORMAT <format> Set output <format>…

• Page 86: Rs-232 Save / Recall System Configurations

  8808A Users Manual Table 4-17. Remote/Local Configuration Commands Command Description REMS Puts the Meter into remote (REMS) state mode without front panel lockout. r is shown on the display. RWLS Puts the Meter in remote with lockout state (RWLS) with front panel lockout. r and L are shown on the display.

• Page 87: Sample Program Using The Rs-232 Computer Interface

  Operating the Meter Using the Computer Interface Sample Program Using the RS-232 Computer Interface Sample Program Using the RS-232 Computer Interface Figure 4-4 is an annotated BASIC A program written for a PC that demonstrates how the Meter can be used with the RS-232 computer interface. aam23f.eps Figure 4-4.

• Page 88
  8808A Users Manual 4-28…

• Page 89: Appendices

  Appendices Appendix Title Page Applications ………………….A-1 2X4 Test Leads ………………..B-1…

• Page 90
  8808A Users Manual…

• Page 91: Using The Dual Display

  Appendix A Applications Introduction This chapter discusses some applications that will help you use the Meter effectively. These applications assume you are familiar with the basic operation of the Meter and have a basic understanding of electronics. A sophisticated understanding of electrical circuits is not necessary.

• Page 92
  8808A Users Manual eue25.eps Figure A-1. Example of Dual Display Showing Volts AC and Frequency Using Measurement Functions in Combination The dual display allows you to display select combinations of measurements for the input signal being measured. Allowable combinations of properties are shown in Table A-1. Volts (dc + ac) rms or current (dc + ac) rms measurements can only be made in the primary display.
• Page 93
  Appendices Applications If the relative readings value of a dc voltage measurement is shown in the primary display and the dc voltage itself is shown in the secondary display, the Meter takes a single measurement and updates both displays with it. Updating Primary and Secondary Displays with Separate Measurements If the measurement function in the primary display is different from that in the secondary display, the Meter updates each display using a separate measurement.
• Page 94
  8808A Users Manual Table A-2. Sample Dual Display Applications (cont.) Primary Secondary Applications Display Display Resistance Select and sort resistors. (See also «Using the Compare Function» in Chapter 3.) HOLD Actual Value Show actual measurement while holding a previous, stable measurement on the primary display 8808A 5-1/2 DIGIT MULTIMETER…
• Page 95
  Appendices Applications function selected, number of measurements being made (single measurement when only the primary display is used, or two measurements when both the primary and secondary display are used), the input level, range type (autorange or manual range), the measurement rate (slow, medium, or fast), and whether measurement types are mixed or not.
• Page 96
  8808A Users Manual Table A-3. Typical Single Measurement Response Times (in Seconds) Slow Rate Medium Rate Fast Rate Meas. Auto Single Auto Single Auto Single Function Range Range Range Range Range Range 0.05 0.05 0.05 0.05 0.10 0.72 0.18 0.56 0.14 Time to autorange a new measurement from the lowest to the highest range and to display the result.

• Page 97: External Trigger

  Appendices Applications Table A-5. Typical Measurement Intervals (in Seconds) for Dual Display Measurements Meas. Range Slow Fast Function 0.85 0.85 External Trigger The external trigger can be used with or without settling delays, as shown in Table A-4. (Refer to Table 4-3 for trigger types.) The amount of trigger delay varies depending on differences between the primary and secondary displays, as described in the previous section.

• Page 98
  8808A Users Manual Making Low-Level Current Measurements There are many applications where obtaining the utmost accuracy in low-level current measurements is critical. For example, determining the leakage current of a battery operated device in its standby mode is critical in determining the time before battery re- charge is needed.
• Page 99
  2X4 Test Leads Introduction The optional Fluke TL2X4W test leads simplify making 4-wire ohms measurements by integrating the Hi-Hi Sense and Lo-Lo Sense test leads into one cable. The Meter’s Input HI and LO jacks consist of two contacts. One contact is connected to HI or LO input circuits and the other contact is connected to the Sense input circuits.
• Page 100
  8808A Users Manual…

PDF инструкция  · 100 страниц(ы) английский

• Page 1
  ® Test Equipment Depot — 800.517.8431 — 99 Washington Street Melrose, MA 02176 — TestEquipmentDepot.com 8808A Digital Multimeter Users Manual July 2007 © 2007 Fluke Corporation, All rights reserved. All product names are trademarks of their respective companies.
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  Fluke authorized resellers shall extend this warranty on new and unused products to end-user customers only but have no authority to extend a greater or different warranty on behalf of Fluke. Warranty support is available only if product is purchased through a Fluke authorized sales outlet or Buyer has paid the applicable international price.
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  Resistance …………………. 1-11 DC Current ………………..1-11 AC Current ………………..1-12 Frequency …………………. 1-13 Continuity …………………. 1-13 Diode Test ………………… 1-13 Preparing the Meter for Operation …………. 2-1 Introduction………………….2-3 Unpacking and Inspecting the Meter …………..2-3 Contacting Fluke………………..2-3…
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  Turning Power On ………………… 2-8 Adjusting the Bail ………………..2-8 Installing the Meter into an Equipment Rack ………… 2-8 Cleaning the Meter………………… 2-9 Fluke 45 Emulation……………….. 2-9 Illuminating All Display Segments…………..2-10 Operating the Meter from the Front Panel ……..3-1 Introduction………………….3-3 Dual Display ………………….
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  (continued) Contents Introduction………………….4-3 Local and Remote Operations …………… 4-3 Computer Interfaces ………………4-3 Preparing the Meter for Operations via the RS-232 Interface ……4-3 Setting Communication Parameters (RS-232) ……….4-3 RS-232 Print-Only Mode …………….4-4 Cabling the Meter to a Host or Printer (RS-232)……….. 4-5 Character Echoing and Deletion…………..
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  8808A…
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  Safety and Electrical Symbols…………….1-6 1-3. Accessories………………….1-7 2-1. Line Voltage to Fuse Rating………………. 2-4 2-2. Line-Power Cord Types Available from Fluke…………2-7 3-1. Front-Panel Features ………………..3-4 3-2. Display Annunciators and Indicators …………..3-7 3-3. Rear-Panel Features ………………..3-8 3-4.
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  8808A A-4. Typical Settling Delays (in Seconds) …………..A-6 A-5. Typical Measurement Intervals (in seconds) for Dual Display Measurements ..A-7…
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  List of Figures 2-1. Replacing the Line Power Fuse…………….2-5 2-2. Replacing the Current-Input Fuses…………….. 2-6 2-3. Line-Power Cord Types Available from Fluke…………2-7 2-4. Bail Adjustment and Removal …………….2-8 2-5. Boot removal………………….2-9 3-1. Front Panel ………………….3-4 3-2.
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  8808A viii…
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  Chapter 1 Introduction and Specifications Title Page Introduction………………….1-3 Manual Set ………………….1-3 About this Manual ………………… 1-4 Safety Information ………………… 1-4 General Safety Summary…………….1-4 Symbols ………………….1-6 Options and Accessories ………………1-7 General Specifications ………………1-8 Voltage ………………….1-8 Dimensions ………………..
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  8808A Users Manual…
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  Introduction and Specifications Introduction Introduction The Fluke 8808A Digital Multimeter (hereafter referred to as the Meter) is a 5-1/2 digit dual-display multimeter designed for bench-top, field service, and system applications. The multiple measurement functions, plus the RS-232 remote interface, make the Meter an ideal candidate for precision manual measurements and use in automated systems.
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  8808A Users Manual About this Manual This manual contains all the information a new user will need to operate the Meter effectively. This manual is divided into the following chapters: Chapter 1, “Introduction and Specifications,” provides information on how safely to use the Meter, and standard and optional accessories and specifications.
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  Introduction and Specifications Safety Information Table 1-1. Safety Information XW Warning To avoid possible electric shock, personal injury, or death, read the following before using the Meter: • Use the Meter only as specified in this manual, or the protection provided by the Meter might be impaired.
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  Recycle Do not dispose of this product as Static awareness. Static discharge unsorted municipal waste. Contact can damage parts. Fluke or a qualified recycler for disposal. Measurement Category II is for Measurement Category I is for measurements performed on CAT II…
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  Introduction and Specifications Options and Accessories Options and Accessories Table 1-3 lists available options and accessories. Table 1-3. Accessories Item Model / Part Number Premium Test Lead Set TL71 Fuse, .25*1.25, 0.063 A, 250 V, Slow 163030 Fuse, .25*1.25, 0.125 A, 250 V, Slow 166488 F1 — Fuse, 11 A, 1000 V, Fast, 406INX1.5IN, BULK 803293…
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  8808A Users Manual General Specifications Voltage 100V Setting …………90 V to 110 V 120V Setting …………. 108 V to 132 V 220V Setting …………. 198 V to 242 V 240V Setting …………. 216 V to 264 V Frequency…………47 Hz to 440 Hz Power Consumption ………
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  Introduction and Specifications Electrical Specifications Electrical Input Protection ……….1000 V all ranges Overrange …………10 % on the largest ranges of all functions except continuity and diode test Remote Interfaces RS-232C Warranty One year Electrical Specifications Accuracy specifications are valid for 5-½ digit mode and after at least a half-hour warm-up DC Voltage Specifications Maximum Input ……….
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  8808A Users Manual AC Voltage Specifications AC Voltage specifications are for ac sinewave signals >5 % of range. For inputs from 1 % to 5 % of range and <50 kHz, add an additional error of 0.1 % of range, and for 50kHz to 100 kHz, add 0.13 % of range. Maximum Input ……….
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  Introduction and Specifications Electrical Specifications Resistance Specifications are for 4-wire resistance function, or 2-wire resistance with REL. If REL is not used, add 0.2 Ω for 2-wire resistance plus lead resistance. Measurement Method ……..Current source referenced to LO input Max Lead Resistance (4-wire ohms) ….
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  8808A Users Manual Accuracy Accuracy Temperature Coefficient/°C Range Outside 18 – 28 °C 90 days 1 year 23 °C ± 5 °C 23 °C ± 5 °C 200 μA 0.02 + 0.005 0.03 + 0.005 0.003 + 0.001 2 mA 0.015 + 0.005 0.02 + 0.005 0.002 + 0.001…
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  Introduction and Specifications Electrical Specifications Frequency Gate Time …………131 ms Measurement Method ……..AC-coupled input using the ac voltage measurement function. Settling Considerations ……..When measuring frequency after a dc offset voltage change, errors may occur. For the most accurate measurement, wait up to 1 second to allow input blocking RC time constant to settle.
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  8808A Users Manual 1-14…
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  Current-Input Fuses………………. 2-5 Connecting to Line Power …………….. 2-7 Turning Power On ………………… 2-8 Adjusting the Bail ………………..2-8 Installing the Meter into an Equipment Rack ………… 2-8 Cleaning the Meter………………… 2-9 Fluke 45 Emulation……………….. 2-9 Illuminating All Display Segments…………..2-10…
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  8808A Users Manual…
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  Carefully unpack the Meter from its shipping container and inspect the contents for damaged or missing items. If the Meter appears damaged or something is missing, contact the carrier and Fluke immediately. Save the container and packing material in case you have to return the Meter.
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  8808A Users Manual Selecting the Line Voltage The Meter operates on four different input line voltages. The selected line-voltage setting is visible through the window in the line-fuse holder on the Meter’s rear panel. 1. Unplug the power cord. 2. Insert a small screwdriver blade into the narrow recess to the left of the fuse holder and pry it to the right until the holder pops out.
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  Preparing the Meter for Operation Power Considerations eue20.eps Figure 2-1. Replacing the Line Power Fuse Current-Input Fuses The 200 mA and 10 A inputs are protected by user-replaceable fuses. • The 200 mA input is protected by a fuse (F2) rated at 440 mA, 1000 V (fast blow), 10,000 A minimum breaking capacity.
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  8808A Users Manual 1. Remove power from the Meter by unplugging its power cord. 2. Turn the Meter upside down. 3. Remove the retaining screw on the fuse access door located on the bottom of the Meter. See Figure 2-2. 4.
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  2. Verify that the correct fuse for the line voltage is installed. 3. Connect the power cord to a properly grounded three-prong outlet. See Figure 2- 3 for line-power cord types available from Fluke. Refer to Table 2-2 for descriptions of the line-power cords.
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  8808A Users Manual Turning Power On 1. If required, connect the Meter to line power. 2. Toggle the power switch on the rear panel so the “I” side of the switch is depressed. The Meter will turn on and briefly illuminate all LCD segments. Note To save on power consumption, the Meter can be set to a standby mode by pressing P on the front panel.
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  Do not use aromatic hydrocarbons, alchohol, chlorinated solvents, or methanol-based fluids when wiping down the Meter. Fluke 45 Emulation To switch the Meter to Fluke 45 emulation: Press and hold Sand f for two seconds.
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  8808A Users Manual Press Uor Vto scroll between F8808A and F45. The presently selected mode will appear bright in the display, while the other is dim. Press R to set the mode and reset the Meter. Illuminating All Display Segments To illimunate all display segments, start wth the Meter display off.
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  Chapter 3 Operating the Meter from the Front Panel Title Page Introduction………………….3-3 Dual Display …………………. 3-6 Primary Display………………… 3-6 Secondary Display………………3-6 Rear Panel ………………….3-8 Adjusting Meter Range ………………3-8 Selecting a Measurement Rate…………….3-9 Selecting a Measurement Function…………..3-9 Measuring Voltage ………………
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  8808A Users Manual Calibration ………………….3-25…
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  Operating the Meter from the Front Panel Introduction Introduction The Meter can be controlled either by sending commands through its RS232 communication interface or through the front panel. This chapter explains the function and use of the controls and indicators located on the front panel of the Meter. Operating the Meter through its RS232 communication interface is covered in Chapter 4.
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  8808A Users Manual 8808A 5-1/2 DIGIT MULTIMETER INPUT SENSE 2W/4W 1000 V CAT I 1000V 300V 600 V CAT II 750V 500 V pk 200 mA 10 A eue02.eps Figure 3-1. Front Panel Table 3-1. Front-Panel Features Name Description INPUT VZYR HI, LO Input terminals for Volts, 2-Wire and 4-Wire Ohms, and Hz measurements.
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  Operating the Meter from the Front Panel Introduction Table 3-1. Front-Panel Features (cont.) Name Description Primary operation: Sets the Meter’s measurement rate to slow, medium or fast Second level operation: Selects source for triggering measurement Primary operation: Selects Touch Hold function Second level operation: Sets Touch Hold minimum response level Primary operation: Selects relative readings function to display…
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  8808A Users Manual Dual Display The Meter has a 5-1/2 digit vacuum fluorescent dual display. See Figure 3-2 and Table 3- 2 for an overview of the display annunciators and indicators The dual display is comprised of a primary display and a secondary display, which show measurement readings, annunciators and messages.
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  Operating the Meter from the Front Panel Dual Display Table 3-2. Display Annunciators and Indicators Name Description Meter is in remote mode (remotely controlled) the front panel is locked out Ext Trig Meter is in external trigger mode is pressed and secondary function will be selected Relative readings function modifier is selected Measurement value in secondary display is negative –…
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  8808A Users Manual Rear Panel See Figure 3-3 and Table 3-3 for an overview of the rear-panel features. eue03.eps Figure 3-3. Rear Panel Table 3-3. Rear-Panel Features Name Description Line power terminal Connects Meter to power source via power cord Power switch Turns power on and off to the Meter Fuse holder and power line voltage…
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  Operating the Meter from the Front Panel Selecting a Measurement Rate In autoranging mode, the Meter automatically selects the next higher range when a reading is greater than full-scale. If no higher range is available, 0L is displayed on the primary or secondary display to indicate an overload.
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  8808A Users Manual Measuring Voltage The Meter is capable of measuring voltage up to 1000 V dc and 750 V ac. W Caution To avoid possible damage to the Meter, do not apply voltage to the Meter’s inputs until the test leads are properly connected and the proper voltage function is selected.
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  Operating the Meter from the Front Panel Selecting a Measurement Function Frequency Ranging Frequency measurements are automatically ranged so that a frequency measurement is always displayed with maximum resolution. To select a range manually, press F to select the frequency function, and then press U or V to select a range manually.
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  10 A eue12.eps Figure 3-6. 4-Wire Resistance Measurement To make a four-wire resistance measurement using Fluke’s 2X4 test leads: 1. Connect the test leads to the Meter’s input connectors as show in Figure 3-7. 2. Press N. 2*4 Wire is displayed.
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  Operating the Meter from the Front Panel Selecting a Measurement Function INPUT SENSE 2W/4W 1000 V CAT I 1000V 300V 600 V CAT II 750V 500 V pk 200 mA 10 A Ground tab eue26.eps Figure 3-7. Input Connections for 4-Wire Ohms Using 2×4 Wire Leads Measuring Current W Caution To avoid blowing the current fuse or damaging the Meter, do…
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  8808A Users Manual I < 200 mA INPUT SENSE 2W/4W 1000 V CAT I 1000V 300V 750V 600 V CAT II 500 V pk 200 mA 10 A V AC eue13.eps Figure 3-8. Current Measurement <200 mA I > 200 mA INPUT SENSE I <…
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  Operating the Meter from the Front Panel Selecting a Measurement Function Diode / Continuity Testing Press G to toggle between the continuity and diode test functions for the primary display. (These functions cannot be selected for the secondary display.) To perform a continuity test: 1.
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  8808A Users Manual INPUT SENSE 2W/4W 1000 V CAT I 1000V 300V 600 V CAT II 750V 500 V pk 200 mA 10 A eue16.eps Figure 3-11. Diode Test Making a Triggered Measurement The Meter features a trigger function that allows you to select a measurement trigger source.
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  Operating the Meter from the Front Panel Selecting a Function Modifier An external TTL signal on pin 9 will trigger a measurement cycle. Alternatively, pin 9 of the RS-232 interface can be connected to pin 1 through an external switch. See Figure 3- 12.
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  8808A Users Manual After a function modifier is selected, pressing any function button turns off all modifiers, causes the secondary display to go blank, and returns unmodified readings to the primary display. Relative Readings Modifier (REL) The relative readings modifier displays the difference between the relative base and the input measurement.
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  Operating the Meter from the Front Panel Selecting a Function Modifier Table 3-5. dBM Reference Impedances Impedance Impedance Impedance 8000 Ω 300 Ω 93 Ω 1200 Ω 250 Ω 75 Ω 1000 Ω 150 Ω 50 Ω 900 Ω 135 Ω 16 Ω…
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  8808A Users Manual • Level 1 (0.01 % of reading) • Level 2 (0.1 % of reading) • Level 3 (1 % of reading) • Level 4 (10 % of reading) To change the response level, press Q and I. The response level currently selected (1, 2, 3 or 4) appears on the primary display.
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  Operating the Meter from the Front Panel Selecting a Function Modifier Using the Function Modifiers in Combination You can use multiple function modifiers simultaneously. Selected modifiers are evaluated in the following order: Touch Hold, minimum/maximum, and then relative readings. The Meter first looks for a stable measurement for Touch Hold, then determines if the measurement is a new minimum or maximum value, and then subtracts the relative base from the measurement.
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  8808A Users Manual Table 3-6. Second Level Operations (cont.) Buttons Description In COMP mode, stores value on primary display as LO compare point (see the “Using the Compare Function” section later in this manual) In COMP mode, stores value on primary display as HI compare point (see “Using the Compare Function”) [1] Hold both buttons for 2 seconds.
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  Operating the Meter from the Front Panel List and Number Editors Using the List Editor The list editor is used to select the options described in Table 3-7. You may abort an edit and return to normal operation at any time by pressing Q. To use the list editor: 1.
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  8808A Users Manual Using the Number Editor Use the number editor to edit the relative base for the relative readings modifier and to set the high and low threshold values for the compare function. Note that you can abort the number editor and return the Meter to normal operation by pressing Q.
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  Operating the Meter from the Front Panel Power-Up Configuration • Measurement function on secondary display • Range mode on primary display (manual or autorange) • Measurement rate (slow, medium, fast) • Dual display status (active or inactive) • Any combination of selected function modifiers •…
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  8808A Users Manual 3-26…
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  Chapter 4 Operating the Meter Using the Computer Interface Title Page Introduction………………….4-3 Local and Remote Operations …………… 4-3 Computer Interfaces ………………4-3 Preparing the Meter for Operations via the RS-232 Interface ……4-3 Setting Communication Parameters (RS-232) ……….4-3 RS-232 Print-Only Mode …………….
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  8808A Users Manual Compare Commands and Queries …………..4-24 Trigger Configuration Commands…………..4-24 Miscellaneous Commands and Queries…………4-25 RS-232 Remote / Local Configurations …………4-25 RS-232 Save / Recall System Configurations ……….4-26 Sample Program Using the RS-232 Computer Interface ……..4-27…
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  Operating the Meter Using the Computer Interface Introduction Introduction This chapter describes how to set up, configure and operate the Meter via the RS-232 computer interface on the Meter’s rear panel. The Meter can be operated from a host (a terminal, controller, PC, or computer) by sending commands to the Meter through its computer interface.
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  RS-232 Print-Only Mode The print-only mode is used to send measurements to a printer or terminal automatically. While the Meter will respond to remote commands during print-only operations, Fluke recommends first setting the Meter’s echo mode to OFF. This prevents mixing echoed command characters and incoming data.
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  Longer cables can be used if the load capacitance at the interface point (including signal terminator) is less than 2500 pf. To connect the Meter to a personal computer (with DB-9 connector), use a Fluke RS41-3 Null modem cable. Refer to Table 1-3.
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  4. Type *IDN? and press Enter. 5. Verify that the Meter sends the following response: FLUKE, 8808A, nnnnnnn, n.n Dn.n Where nnnnnnn is the Meter’s serial number; n.n is the main software version; and Dn.n is the display’s software version.
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  Operating the Meter Using the Computer Interface How the Meter Processes Input 6. If the Meter does not respond as indicated, refer to the “If Test Fails” section. If Test Fails If the Meter does not respond as indicated in the “Installation Test for RS-232 Operation” section, perform the following: 1.
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  8808A Users Manual In some instances, a terminator is automatically transmitted at the end of the host’s output string (the Meter’s input string). Sending Numeric Values to the Meter Numeric values can be sent to the Meter as integers, real numbers, or real numbers with exponents, as shown in the following examples: +12345689 Sends the signed integer “12345689”…
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  Operating the Meter Using the Computer Interface Triggering Output +1.2345E+6(format 1) Measured value of 1.2345M +12.345E+6 OHM(format 2) Measured value of 12.345Mohms +/- 1.0E+9 Overload (0L on the display) Triggering Output The Meter takes measurements when triggered to do so. There are five trigger types, which are described in Table 4-3.
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  8808A Users Manual If you enter the remote mode with trigger type 4 or 5 selected, the Meter remains in its external trigger state; however, because the Meter is in the remote mode, you will only be able to trigger measurements with rear trigger types 4 and 5. To exit remote mode, perform steps 1 and 2 and select trigger type 2 or 3 (as applicable).
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  Operating the Meter Using the Computer Interface Status Registers Status Registers The contents of the status register (STB) are determined by the service enable register (SRE), event status register (ESR), event status enable register (ESE), and the output buffer. These status registers are explained in the following paragraphs and summarized in Table 4-5.
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  8808A Users Manual Standard Event Status Register Read Using *ESR? & & & & & & & Queue & Not-Empty Standard Event Status Enable Register Read Using *ESE? Write to Using *ESE Output Queue Read by Serial Poll Service Status Byte Register ESB MAV Request Generation…
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  Operating the Meter Using the Computer Interface Status Registers The ESE is a mask register that allows the host to enable or disable (mask) each bit in the ESR. When a bit in the ESE is set to 1, the corresponding bit in the ESR is enabled. When any enabled bit in the ESR changes from 0 to 1, the ESB bit in the STB also changes to 1.
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  8808A Users Manual Table 4-6. Description of Bits in ESR and ESE Bit No. Name Condition Operation Complete (OPC) All commands before receipt of an *OPC command have been executed. Interface is ready to accept another message. Not used Always set to 0. Query Error (QYE) Attempted to read data from the Meter’s output buffer when no output was present or pending.
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  Operating the Meter Using the Computer Interface Computer Interface Command Set Table 4-7. Description of Bits in the Status Byte Register (STB) (cont.) Bit No. Name Condition Master Summary Status (MSS) Set to 1 if any enabled bit in the STB (MSS) register is set to 1;…
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  (1 or 0) of bits in the register. *IDN? Identification Query Meter returns the identification code of the Meter as four fields separated by commas. These fields are: Manufacturer (FLUKE); model (8808A); seven-digit serial number; and versions of main software and display software. *OPC Operation Complete…
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  Operating the Meter Using the Computer Interface Computer Interface Command Set Table 4-8. Common Commands (cont.) Command Name Description *SRE Service Request Enable Sets the Service Request Enable Register to <value>, where <value> is an integer between 0 and 255. The value of bit 6 is ignored because the Service Request Enable Register does not use it.
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  8808A Users Manual Table 4-9. Function Commands and Queries (cont.) Commands Function Primary Display Secondary Display FUNC1? (Not applicable) Meter returns function selected as command mnemonic. For example, if frequency is selected, FUNC1? returns FREQ. (Not applicable) FUNC2? Meter returns function selected as command mnemonic.
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  Operating the Meter Using the Computer Interface Computer Interface Command Set Function Modifier Commands and Queries Table 4-10 describes function modifier commands and queries. A function modifier causes the Meter to modify the normal operation of a measurement function or to perform an action on a measurement before displaying a reading.
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  8808A Users Manual Table 4-10. Function Modifier Commands and Queries (cont.) Command Description HOLDTHRESH? Meter returns Touch Hold <threshold> (1, 2, 3, or 4). See “Touch Hold Function (HOLD)” in Chapter 3 for more information. Meter enters MAX modifier with present reading as maximum value. If already in MAX modifier, Meter displays maximum value.
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  Operating the Meter Using the Computer Interface Computer Interface Command Set Table 4-10. Function Modifier Commands and Queries (cont.) Command Description MOD? Meter returns a numeric value indicating modifiers in use, where 1 = MIN; 2 = MAX; 4 = HOLD; 8 = dB; 16 = dB Power; 32 = REL; and 64 = COMP. If multiple modifiers are selected, the value returned is equal to the sum of the values of the selected modifiers.
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  8808A Users Manual Table 4-11. Range and Measurement Rate Commands and Queries (cont.) Command Description RANGE <value range> Sets the primary display to <value range> where <value range> is the number in the Range Value column of Table 4-11A that corresponds with the applicable function ranges (voltage, ohms, current, etc.).
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  Operating the Meter Using the Computer Interface Computer Interface Command Set Measurement Queries Table 4-12 describes measurement queries, which are shown on the primary and/or secondary displays. Table 4-12. Measurement Queries Command Description MEAS1? Meter returns the value shown on the primary display after the next triggered measurement is completed.
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  8808A Users Manual Compare Commands and Queries Table 4-13 describes the compare commands and queries. These commands cause the Meter to determine whether a measurement is higher than, lower than, or within a specified range. These commands correspond with C, U and V on the front panel.
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  Operating the Meter Using the Computer Interface Computer Interface Command Set Miscellaneous Commands and Queries Table 4-15 describes miscellaneous commands and queries. Table 4-15. Miscellaneous Commands and Queries Command Description ^C (CONTRL C) Causes =><CR><LF> to be output. FORMAT <format> Set output <format>…
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  8808A Users Manual Table 4-17. Remote/Local Configuration Commands Command Description REMS Puts the Meter into remote (REMS) state mode without front panel lockout. r is shown on the display. RWLS Puts the Meter in remote with lockout state (RWLS) with front panel lockout. r and L are shown on the display.
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  Operating the Meter Using the Computer Interface Sample Program Using the RS-232 Computer Interface Sample Program Using the RS-232 Computer Interface Figure 4-4 is an annotated BASIC A program written for a PC that demonstrates how the Meter can be used with the RS-232 computer interface. aam23f.eps Figure 4-4.
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  8808A Users Manual 4-28…
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  Appendices Appendix Title Page Applications ………………….A-1 2X4 Test Leads ………………..B-1…
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  8808A Users Manual…
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  Appendix A Applications Introduction This chapter discusses some applications that will help you use the Meter effectively. These applications assume you are familiar with the basic operation of the Meter and have a basic understanding of electronics. A sophisticated understanding of electrical circuits is not necessary.
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  8808A Users Manual eue25.eps Figure A-1. Example of Dual Display Showing Volts AC and Frequency Using Measurement Functions in Combination The dual display allows you to display select combinations of measurements for the input signal being measured. Allowable combinations of properties are shown in Table A-1. Volts (dc + ac) rms or current (dc + ac) rms measurements can only be made in the primary display.
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  Appendices Applications If the relative readings value of a dc voltage measurement is shown in the primary display and the dc voltage itself is shown in the secondary display, the Meter takes a single measurement and updates both displays with it. Updating Primary and Secondary Displays with Separate Measurements If the measurement function in the primary display is different from that in the secondary display, the Meter updates each display using a separate measurement.
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  8808A Users Manual Table A-2. Sample Dual Display Applications (cont.) Primary Secondary Applications Display Display • Select and sort resistors. (See also «Using the Compare Function» Resistance in Chapter 3.) • Show actual measurement while holding a previous, stable HOLD Actual Value measurement on the primary display 8808A…
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  Appendices Applications Repsonse Times Response time is the time between a change in an input and when that change is displayed. The meter’s response time depends on many factors: the measurement function selected, number of measurements being made (single measurement when only the primary display is used, or two measurements when both the primary and secondary display are used), the input level, range type (autorange or manual range), the measurement rate (slow, medium, or fast), and whether measurement types are mixed or…
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  8808A Users Manual Table A-3. Typical Single Measurement Response Times (in Seconds) Slow Rate Medium Rate Fast Rate Meas. Auto Single Auto Single Auto Single Function Range Range Range Range Range Range 0.05 0.05 0.05 0.05 0.05 0.15 Time to autorange a new measurement from the lowest to the highest range and to display the result. Typical time to change to the next higher or lower range and display the result.
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  Appendices Applications Table A-5. Typical Measurement Intervals (in Seconds) for Dual Display Measurements Meas. Range Slow Fast Function 0.85 0.85 External Trigger The external trigger can be used with or without settling delays, as shown in Table A-4. (Refer to Table 4-3 for trigger types.) The amount of trigger delay varies depending on differences between the primary and secondary displays, as described in the previous section.
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  8808A Users Manual Making Low-Level Current Measurements There are many applications where obtaining the utmost accuracy in low-level current measurements is critical. For example, determining the leakage current of a battery operated device in its standby mode is critical in determining the time before battery re- charge is needed.
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  2X4 Test Leads Introduction The optional Fluke TL2X4W test leads simplify making 4-wire ohms measurements by integrating the Hi-Hi Sense and Lo-Lo Sense test leads into one cable. The Meter’s Input HI and LO jacks consist of two contacts. One contact is connected to HI or LO input circuits and the other contact is connected to the Sense input circuits.
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  8808A Users Manual…

8808A

Users Manual

8808A

Users Manual

About this Manual

This manual contains all the information a new user will need to operate the Meter effectively. This manual is divided into the following chapters:

Chapter 1, “Introduction and Specifications,” provides information on how safely to use the Meter, and standard and optional accessories and specifications.

Chapter 2, “Preparing the Meter for Operation,” provides information on setting the Meter’s line voltage, connecting it to a power source, and turning the Meter on.

Chapter 3, “Operating the Meter from the Front Panel,” provides detailed information on using the Meter from the front panel.

Chapter 4, “Applications,” provides detailed information on using the Meter to make electrical measurements.

Chapter 5, “Operating the Meter using the Computer Interface,” describes how to set up, configure, and operate the Meter via the RS-232 computer interface on the Meter’s rear panel.

Appendices

Safety Information

This section addresses safety considerations and describes symbols that may appear on the Meter or in the manual.

A Warning statement identifies conditions or practices that could result in injury or death. A Caution statement identifies conditions or practices that could result in damage to the Meter or equipment to which it is connected.

XWWarning

To avoid electric shock, personal injury, or death, carefully read the information in Table 1-1, “Safety Information,” before attempting to install, use or service the Meter.

General Safety Summary

This instrument has been designed and tested in accordance with the European standard publication EN61010-1: 2001 and U.S. / Canadian standard publications UL 61010- 1:2004and CAN/CSA-C22.2 No.61010.1:2004. The Meter has been supplied in a safe condition.

This manual contains information and warnings that must be observed to keep the instrument in a safe condition and ensure safe operation.

To use the Meter correctly and safely, read and follow the precautions in Table 1-1 and follow all the safety instructions or warnings given throughout this manual that relate to specific measurement functions. In addition, follow all generally accepted safety practices and procedures required when working with and around electricity.

8808A

Users Manual

Symbols

Table 1-2 lists safety and electrical symbols that appear on the Meter or in this manual.

Table 1-2. Safety and Electrical Symbols

8808A

Users Manual

General Specifications

Voltage

Dimensions

Display

Vacuum Fluorescent Display, segment

Environment

Temperature

Safety

Complies with IEC 61010-1:2001, ANSI/ISA 61010-1 (S82.02.01):2004, UL 61010-1:2004, CAN/CSA C22.2 No. 61010.1:2004, CAT I 1000V/CAT II 600 V

EMC

Designed to comply with IEC 61326-1:1997+A1:1998+A2:2000

Triggering

Math Functions

Min/max, relative, hold, compare and dB functions

8808A

Users Manual

AC Voltage Specifications

AC Voltage specifications are for ac sinewave signals >5 % of range. For inputs from 1 % to 5 % of range and <50 kHz, add an additional error of 0.1 % of range, and for 50kHz to 100 kHz, add 0.13 % of range.

Notes:

[1]Accuracy given as ± (% of reading + % of range)

8808A

Users Manual

Accuracy

Notes:

[1] Accuracy given as ± (% of reading + % of range)

AC Current

The following ac current specifications are for sinusoidal signals with amplitudes greater than 5 % of range. For inputs from 1 % to 5 % of range, add an additional error of 0.1 % of range.

Input Characteristics

Notes:

[1]Accuracy given as ± (% of reading + % of range)

Chapter 2

Preparing the Meter for Operation

8808A

Users Manual

Selecting the Line Voltage

The Meter operates on four different input line voltages. The selected line-voltage setting is visible through the window in the line-fuse holder on the Meter’s rear panel.

1.Unplug the power cord.

2.Insert a small screwdriver blade into the narrow recess to the left of the fuse holder and pry it to the right until the holder pops out. See Figure 2-1.

3.Remove the voltage-selector block from the fuse holder.

4.Rotate the selector block until the desired voltage rating faces outward.

5.Replace the selector block back into the fuse holder.

6.Install the fuse holder back into the Meter and reconnect the power cord.

Changing the line-voltage setting may require a different line-power fuse for proper operation.

Replacing the Fuses

The Meter uses one fuse to protect the line-power input and two fuses to protect the current-measurement inputs.

Line-Power Fuse

The Meter has a line-power fuse in series with the power supply. Table 2-1 indicates the proper fuse for each of the four line-voltage selections. The line-power fuse is accessed through the rear panel.

1.Unplug the power cord.

2.Insert a small screwdriver blade into the narrow recess to the left of the fuse holder and pry it to the right until the holder pops out. See Figure 2-1.

3.Remove the fuse and replace it with a fuse of an appropriate rating for the selected line-power voltage. See Table 2-1.

4.Replace the selector block back into the fuse holder.

XW Warning

To avoid electric shock or fire, do not use makeshift fuses or short-circuit the fuse holder.

Table 2-1. Line Voltage to Fuse Rating

8808A

Users Manual

1.Remove power from the Meter by unplugging its power cord.

2.Turn the Meter upside down.

3.Remove the retaining screw on the fuse access door located on the bottom of the Meter. See Figure 2-2.

4.Remove the protective cover from the fuse holders by slightly depressing the back edge of the cover to unlatch it from the printed circuit board. Pull up on the back edge of the cover and remove it from the fuse compartment.

5.Remove the defective fuse and replace it with a fuse of an appropriate rating. See Table 2-1.

6.Replace the protective cover by pushing it over the fuses while aligning the catches with the holes in the printed circuit board. Press the cover down until the catches engage the printed circuit board.

7.Replace the fuse access door and install the retaining screw.

Fuses F2

F1

Bottom front left corner

eue04.eps

Figure 2-2. Replacing the Current-Input Fuses

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