® 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.
LIMITED WARRANTY AND LIMITATION OF LIABILITY Each Fluke product is warranted to be free from defects in material and workmanship under normal use and service. The warranty period is one year and begins on the date of shipment. Parts, product repairs, and services are warranted for 90 days.
Table of Contents Chapter 1 Title Introduction and Specifications......................................................... 1-1 Introduction........................................................................................................ Manual Set ......................................................................................................... About this Manual ............................................................................................. Safety Information .................
8808A Users Manual Storing and Shipping the Meter ......................................................................... Power Considerations ........................................................................................ Selecting the Line Voltage ............................................................................ Replacing the Fuses....................................................................................... Line-Power Fuse ..................................................
Contents (continued) Introduction........................................................................................................ Local and Remote Operations ....................................................................... Computer Interfaces ...................................................................................... Preparing the Meter for Operations via the RS-232 Interface ........................... Setting Communication Parameters (RS-232) ....................................
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List of Tables Table 1-1. 1-2. 1-3. 2-1. 2-2. 3-1. 3-2. 3-3. 3-4. 3-5. 3-6. 3-7. 3-8. 3-9. 4-1. 4-2. 4-3. 4-4. 4-5. 4-6. 4-7. 4-8. 4-9. 4-10. 4-11. 4-12. 4-13. 4-14. 4-15. 4-16. 4-17. 4-18. A-1. A-2. A-3. Title Safety Information ................................................................................................. Safety and Electrical Symbols................................................................................ Accessories.............................................................
808A A-4. Typical Settling Delays (in Seconds) ..................................................................... A-6 A-5. Typical Measurement Intervals (in seconds) for Dual Display Measurements .....
List of Figures 2-1. 2-2. 2-3. 2-4. 2-5. 3-1. 3-2. 3-3. 3-4. 3-5. 3-6. 3-7. 3-8. 3-9. 3-10. 3-11. 3-12. 4-1. 4-2. 4-3. 4-4. A-1. A-2. A-3. A-4. B-1. Replacing the Line Power Fuse.............................................................................. Replacing the Current-Input Fuses......................................................................... Line-Power Cord Types Available from Fluke...................................................... Bail Adjustment and Removal .....................
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Chapter 1 Introduction and Specifications Title Introduction........................................................................................................ Manual Set ......................................................................................................... About this Manual ............................................................................................. Safety Information .............................................................................................
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Introduction and Specifications Introduction 1 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. For portability, the Meter includes a carrying handle that also serves as a bail for bench-top operation.
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.
Introduction and Specifications Safety Information 1 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. • Do not use the Meter in wet environments. • Inspect the Meter before using it. Do not use the Meter if it appears damaged. • Inspect the test leads before use.
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 Symbol Symbol Description W Risk of danger. Important information. See manual. P Standby power ON / OFF X Hazardous voltage. Voltage > 30 V dc or ac peak might be present.
Introduction and Specifications Options and Accessories 1 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 F2 - Fuse, 440 mA, 1000 V, Fast, 406INX1.
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 ...............................
Introduction and Specifications Electrical Specifications 1 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 ....
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. 7 Maximum Input ................................................. 750 V rms or 1000 V peak or 8 x 10 Volts-Hertz product Measurement Method ....................................... AC-coupled true-rms.
Introduction and Specifications Electrical Specifications 1 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) ............... 10 % of range per lead for 200 Ω, 2 kΩ ranges. 1 kΩ per lead on all other ranges. Input Protection .....................................
8808A Users Manual Accuracy Accuracy Range [1] 90 days 200 μA 2 mA 20 mA 200 mA 2A 10 A Temperature Coefficient/°C Outside 18 – 28 °C 1 year 23 °C ± 5 °C 23 °C ± 5 °C 0.02 + 0.005 0.015 + 0.005 0.03 + 0.02 0.02 + 0.005 0.05 + 0.02 0.18 + 0.01 0.03 + 0.005 0.02 + 0.005 0.04 + 0.02 0.03 + 0.008 0.08 + 0.02 0.2 + 0.01 0.003 + 0.001 0.002 + 0.001 0.005 + 0.001 0.005 + 0.001 0.008 + 0.001 0.008 + 0.
Introduction and Specifications Electrical Specifications 1 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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Chapter 2 Preparing the Meter for Operation Title Introduction........................................................................................................ Unpacking and Inspecting the Meter ................................................................. Contacting Fluke................................................................................................ Storing and Shipping the Meter ......................................................................... Power Considerations ...
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Preparing the Meter for Operation Introduction 2 Introduction This chapter explains how to prepare the Meter for operation by selecting the proper line voltage, connecting the proper power cord for the selected line voltage, and turning the Meter on. Also included is information on the proper storage, shipping, and cleaning of the Meter. Unpacking and Inspecting the Meter Every care is taken in the choice of packing material to ensure that your Meter will reach you in perfect condition.
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.
Preparing the Meter for Operation Power Considerations 2 120 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. • The 10 A input is protected by a fuse (F1) rated at 11 A, 1000 V (fast blow), 10,000 A minimum breaking capacity.
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.
Preparing the Meter for Operation Connecting to Line Power 2 Connecting to Line Power XW Warning To avoid shock hazard, connect the factory supplied threeconductor line power cord to a properly grounded power outlet. Do not use a two-conductor adapter or extension cord, as this will break the protective ground connection.
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. Press it again to bring the Meter up to full power. Adjusting the Bail The Meter’s bail (handle) is adjustable to provide two viewing angles.
Preparing the Meter for Operation Cleaning the Meter 2 To prepare the Meter for rack mounting, remove the bail and remove the front and rear protective boots. To remove a boot, stretch a corner then slide it off as shown in Figure 25. To install the Meter into the rack, refer to the instructions provided with the Rack Mount Kit. eue22.eps Figure 2-5. Boot Removal Cleaning the Meter XW Warning To avoid electric shock or damage to the Meter, never get water inside the Meter.
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. Next, press and hold Sthen press P to turn on the Meter. Release the buttons when the display illuminates. To return to normal measurement mode, press S.
Chapter 3 Operating the Meter from the Front Panel Title Introduction........................................................................................................ Dual Display ...................................................................................................... Primary Display............................................................................................. Secondary Display.........................................................................................
8808A Users Manual Calibration .........................................................................................................
Operating the Meter from the Front Panel Introduction 3 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.
8808A Users Manual 1 2 3 INPUT 4 8808A 5-1/2 DIGIT MULTIMETER SENSE V 4W 2W/4W HI HI 1000V MAX 750V 1000 V 600 V CAT I CAT II 300V 1V LO LO 500 Vpk 200 mA MAX 10 A MAX mA 17 10A 15 16 14 13 12 11 10 9 8 7 6 5 eue02.eps Figure 3-1. Front Panel Table 3-1. Front-Panel Features No. Name Description A INPUT VZYR HI, LO Input terminals for Volts, 2-Wire and 4-Wire Ohms, and Hz measurements. All measurements use the INPUT LO terminal as a common input.
Operating the Meter from the Front Panel Introduction 3 Table 3-1. Front-Panel Features (cont.) No.
8808A Users Manual Dual Display The Meter has a 5-1/2 digit vacuum fluorescent dual display. See Figure 3-2 and Table 32 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. The annunciators indicate measurement units and the Meter’s operating configuration. The dual display allows you to see two properties for the input signal you are measuring.
Operating the Meter from the Front Panel Dual Display 3 Table 3-2. Display Annunciators and Indicators No.
8808A Users Manual Rear Panel See Figure 3-3 and Table 3-3 for an overview of the rear-panel features. 1 2 3 220 5 4 eue03.eps Figure 3-3. Rear Panel Table 3-3. Rear-Panel Features No.
Operating the Meter from the Front Panel Selecting a Measurement Rate 3 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. The Meter automatically selects a lower range when a reading is less than 95 % of full-scale of the lower range. In autoranging mode, pressing U or V changes the mode to manual ranging.
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. To perform a voltage measurement: 1. Connect test leads between the Meter and the circuit under test as shown in Figure 3-4. 2. Press D to measure dc voltage or A to measure ac voltage.
Operating the Meter from the Front Panel Selecting a Measurement Function 3 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. Manual ranging can be performed on readings displayed in the primary display only.
8808A Users Manual 4-Wire Resistance Measurement The Meter incorporates two methods of making a four-wire resistance measurement. The traditional method is to use four meter leads to connect the Meter to the resistance to be measured. The optional 2X4 Wire test leads simplifies the four-wire measurement so you only have to plug in two test leads to the Input HI and LO connectors of the meter. To perform a 4-wire resistance measurement using four test leads: 1.
Operating the Meter from the Front Panel Selecting a Measurement Function INPUT 3 SENSE V 4W 2W/4W HI 1000V MAX 750V HI 1000 V 600 V CAT I CAT II 300V 1V LO LO 500 Vpk 200 mA MAX 10 A MAX mA 10A Ground tab eue26.eps Figure 3-7. Input Connections for 4-Wire Ohms Using 2x4 Wire Leads Measuring Current W Caution To avoid blowing the current fuse or damaging the Meter, do not apply power to the circuit under test until test leads are properly installed to the appropriate input terminals.
8808A Users Manual I < 200 mA INPUT SENSE V 4W 2W/4W HI HI 1000V MAX 750V 1000 V 600 V CAT I CAT II 300V 1V LO LO 500 Vpk 200 mA MAX V AC 10 A MAX mA 10A eue13.eps Figure 3-8. Current Measurement <200 mA I > 200 mA and I < 10 A INPUT SENSE V 4W 2W/4W HI 1000V MAX 750V HI 1000 V 600 V CAT I CAT II 300V 1V LO LO 500 Vpk 200 mA MAX mA V AC 10 A MAX 10A eue14.eps Figure 3-9.
Operating the Meter from the Front Panel Selecting a Measurement Function 3 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. If required, press G to select the continuity test function. 2. Connect the test leads between the Meter and the circuit under test as shown in Figure 3-10. The beeper emits a continuous tone if the input is below 20 e.
8808A Users Manual INPUT SENSE V 4W 2W/4W HI 1000V MAX 750V HI 1000 V 600 V CAT I CAT II 300V 1V LO LO 500 Vpk 200 mA MAX mA 10 A MAX 10A 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. When the trigger mode is set to 3 or 5, the delay between receiving the trigger and the start of a measurement is 400 ms. Refer to Chapter 1 for trigger delay response specifications.
Operating the Meter from the Front Panel Selecting a Function Modifier 3 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 312. A measurement cycle is trigger when the switch is closed and the +5 volts from pin 1 is applied to pin 9. The trigger event occurs on the rising edge of the signal applied to pin 9. Table 3-4. RS-232 Pin Out 1 2 6 3 7 4 8 5 9 eue23.
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. For example, if the relative base is 15.000 V and the present input measurement is 14.100 V, the display will show -0.900.
Operating the Meter from the Front Panel Selecting a Function Modifier 3 Table 3-5. dBM Reference Impedances Impedance Impedance Impedance 8000 Ω 300 Ω 93 Ω 1200 Ω 250 Ω 75 Ω 1000 Ω[1] 150 Ω 50 Ω 900 Ω 135 Ω 16 Ω[2] 800 Ω 125 Ω 8 Ω[2] 600 Ω 124 Ω 4 Ω[2] 500 Ω 110 Ω 2 Ω[2] [1] Voltage annunciator lit [2] Audio power readings possible To access the reference impedance list, press Q then press W.
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. 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.
Operating the Meter from the Front Panel Selecting a Function Modifier 3 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.
8808A Users Manual Table 3-6. Second Level Operations (cont.) Buttons Q and V [1] Q and U[1] 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.
Operating the Meter from the Front Panel List and Number Editors 3 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. Select the option list that you want to edit by pressing the applicable button(s) as indicated in Table 3-7. The option list type is shown in the secondary display and the associated options are shown in the primary display. 2.
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. To use the number editor: 1. Select the number to be edited by pressing the applicable buttons as shown in Table 3-8.
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 • 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) • Last H
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Chapter 4 Operating the Meter Using the Computer Interface Title Introduction........................................................................................................ Local and Remote Operations ....................................................................... Computer Interfaces ...................................................................................... Preparing the Meter for Operations via the RS-232 Interface ...........................
8808A Users Manual Compare Commands and Queries ................................................................. Trigger Configuration Commands................................................................. Miscellaneous Commands and Queries......................................................... RS-232 Remote / Local Configurations ........................................................ RS-232 Save / Recall System Configurations ...............................................
Operating the Meter Using the Computer Interface Introduction 4 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. An annotated sample program illustrating the use of the RS-232 computer interface is provided at the end of this chapter.
8808A Users Manual 6. Press R to review the settings. When you are ready to accept the settings, press and hold R. Table 4-1. RS-232 Communication Parameters Factory Settings Parameter Factory Setting Interface RS-232 (Print-only rate set to 0) Baud rate 9600 Parity None (parity bit 0) Number of data bits 8 (7 data bits plus 1 parity bit) Number of stop bits 1 Echo Off RS-232 Print-Only Mode The print-only mode is used to send measurements to a printer or terminal automatically.
Operating the Meter Using the Computer Interface Preparing the Meter for Operations via the RS-232 Interface 4 Table 4-2. Print Rates in RS-232 Print-Only Mode Rate (N) Seconds between Outputs Minutes between Outputs Slow Slow Medium Fast Medium Fast Hours between Outputs Slow Medium Fast 1 0.4 0.05 0.01 0.01 2 0.8 0.1 0.02 0.01 5 2.0 0.25 0.05 0.03 10 4.0 0.5 0.1 0.07 0.01 20 8.0 1.0 0.2 0.13 0.02 50 20.0 2.5 0.5 0.33 0.04 0.01 0.01 100 40.0 5.0 1.0 0.
8808A Users Manual Character Echoing and Deletion When the Meter is operated via the RS-232 interface, you can control whether characters are echoed to the host's display screen. When Echo is on, characters sent to the Meter are echoed on the host's display screen and prompts are returned. When Echo is off, characters are not echoed, and prompts are not returned. To set the Echo parameter, refer to the “Setting Communication Parameters (RS-232)” section earlier in this chapter.
Operating the Meter Using the Computer Interface How the Meter Processes Input 4 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. Ensure all cables are properly connected. See the “Cabling the Meter to a Host or Printer (RS-232)” section earlier in this chapter. 2. Ensure that the communication parameters (baud rate, parity, etc.
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” -1.2345E2 Sends “-1.2345E2” or “-123.
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) 4 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.
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). Note In external trigger mode (mode 2 to mode 5), *TRG command is always available.
Operating the Meter Using the Computer Interface Status Registers 4 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. Figure 4-2 shows the relationship of these registers. Table 4-5.
8808A Po w er O U n se rR e C om que st m an Ex d Er ec ro ut r io D n ev Er ic ro e r D Q ep ue e ry nd Er en R tE eq ror rro ue r st C O on pe tro ra l tio n C om pl et e Users Manual 7 6 5 4 3 2 1 0 Standard Event Status Register Read Using *ESR? Logical OR & & & & & & & Queue Not-Empty & 7 6 5 4 3 2 1 0 Standard Event Status Enable Register Read Using *ESE? Write to Using *ESE Output Queue Read by Serial Poll RQS Service Request Generation 7 6 ESB MAV 3 2 1 0 Status Byte Register
Operating the Meter Using the Computer Interface Status Registers 4 Operation Complete Request Control Query Error Device Dependent Error Execution Error Command Error User Request Power On 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.
8808A Users Manual Table 4-6. Description of Bits in ESR and ESE Bit No. Name Condition 0 Operation Complete (OPC) All commands before receipt of an *OPC command have been executed. Interface is ready to accept another message. 1 Not used Always set to 0. 2 Query Error (QYE) Attempted to read data from the Meter's output buffer when no output was present or pending. Or received a new command line before a previous query was read. Or input and output buffers were full.
Operating the Meter Using the Computer Interface Computer Interface Command Set 4 Table 4-7. Description of Bits in the Status Byte Register (STB) (cont.) Bit No. 6 Name Master Summary Status (MSS) [1] Condition Set to 1 if any enabled bit in the STB (MSS) register is set to 1; otherwise set to 0. To determine the status of MSS bit, send STB? query command. Request Service (RQS) is set to 1 if service requested from front panel or MSS is set to 1.
8808A Users Manual Common Commands Table 4-8 describes common commands. Table 4-8. Common Commands Command Name Description *CLS Clear Status Clears all event registers summarized in the status byte (except Message Available, which is cleared only if *CLS is the first message in the command line). *ESE Event Status Enable Sets Event Status Enable Register to , where is an integer between 0 and 255.
Operating the Meter Using the Computer Interface Computer Interface Command Set 4 Table 4-8. Common Commands (cont.) Command *SRE Name Service Request Enable Description Sets the Service Request Enable Register to , where is an integer between 0 and 255. The value of bit 6 is ignored because the Service Request Enable Register does not use it. is an integer whose binary equivalent corresponds to the state (1 or 0) of bits in the register.
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. For example, if frequency is selected, FUNC2? returns FREQ If secondary display is not in use, an Execution Error is generated.
Operating the Meter Using the Computer Interface Computer Interface Command Set 4 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. For example, the relative modifier (REL) causes the Meter to display the difference between a measured value and the relative base.
8808A Users Manual Table 4-10. Function Modifier Commands and Queries (cont.) Command Description HOLDTHRESH? Meter returns Touch Hold (1, 2, 3, or 4). See “Touch Hold Function (HOLD)” in Chapter 3 for more information. MAX Meter enters MAX modifier with present reading as maximum value. If already in MAX modifier, Meter displays maximum value. In MAX modifier, autoranging is disabled. See “Minimum / Maximum Modifier (MIN MAX)” in Chapter 3 for more information.
Operating the Meter Using the Computer Interface Computer Interface Command Set 4 Table 4-10. Function Modifier Commands and Queries (cont.) Command MOD? Description 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. For example, if dB and REL are selected, 40 is returned.
8808A Users Manual Table 4-11. Range and Measurement Rate Commands and Queries (cont.) Command RANGE Description Sets the primary display to where is the number in the Range Value column of Table 4-11A that corresponds with the applicable function ranges (voltage, ohms, current, etc.). Table 4-11A. Ranges for Each Function Range Value Voltage Range Ohms Range AC Current Freq.
Operating the Meter Using the Computer Interface Computer Interface Command Set 4 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. MEAS2? Meter returns the value shown on the secondary display after the next triggered measurement is completed.
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. Table 4-13. Compare Commands and Queries Command Description COMP Meter enters compare (COMP) function. Touch Hold is automatically turned on. (Touch Hold can be turned off with HOLDCLR command.
Operating the Meter Using the Computer Interface Computer Interface Command Set 4 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 => to be output. FORMAT Set output to 1 or 2. Format 1 outputs measurement values without measurement units (VDC, ADC, OHMS, etc.). Format 2 allows measurement units to be output with measurement units.
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. When in RWLS, all front panel buttons are disabled. LOCS Puts the Meter is local state (LOCS) mode without lockout. All front panel buttons are enabled.
Operating the Meter Using the Computer Interface Sample Program Using the RS-232 Computer Interface 4 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.
08A Users Manual 4-28
Appendices Appendix A B Title Page Applications ........................................................................................................ A-1 2X4 Test Leads ...................................................................................................
8808A Users Manual
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. Using the Dual Display Using the dual display effectively and with ingenuity can greatly enhance your test and measurement capabilities.
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.
Appendices Applications A 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.
8808A Users Manual Table A-2. Sample Dual Display Applications (cont.) Primary Display Secondary Display Applications REL 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 INPUT 8808A 5-1/2 DIGIT MULTIMETER SENSE 4W V 2W/4W HI 1000V MAX 750V HI 1000 V 600 V CAT I CAT II 300V 1V LO LO 500 Vpk 200 mA MAX mA 10 A MAX 10A eue27.
Appendices Applications A Repsonse Times Response time is the time between a change in an input and when that change is displayed.
8808A Users Manual Table A-3. Typical Single Measurement Response Times (in Seconds) Slow Rate Meas. Function Auto Range[1] Medium Rate Single Range[2] Auto Range[1] Fast Rate Single Range[2] Auto Range[1] Single Range[2] D 1.2 0.4 0.7 0.1 0.5 0.05 A 1.2 0.2 0.7 0.1 0.5 0.05 E 1.4 0.4 0.8 0.1 0.6 0.05 B 1.0 0.2 0.6 0.1 0.5 0.05 O 1.6 0.4 0.9 0.1 0.8 0.05 G N/A N/A N/A N/A N/A N/A F 1.0 0.2 0.6 0.2 0.4 0.
Appendices Applications A Table A-5. Typical Measurement Intervals (in Seconds) for Dual Display Measurements Meas. Function Range Slow Med Fast D All 1.2 1.0 0.9 A All 1.0 0.85 0.8 E All 1.2 1.0 0.9 B All 1.0 0.85 0.8 O N/A N/A N/A N/A G N/A N/A N/A N/A F N/A N/A N/A N/A 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.
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 recharge is needed. Traditional multimeters make these measurements using a shunt method shown in Figure A-3.
Appendix B 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. Like the input jacks, the 2x4 test lead also has two contacts that align with the input jack contacts to provide a four wire connection.
8808A Users Manual B-2
