789 ProcessMeter™ Users Manual August 2002 Rev. 3, 3/13 © 2002-2013 Fluke Corporation, All rights reserved. Specifications are subject to change without notice. All product names are trademarks of their respective companies.
LIMITED WARRANTY AND LIMITATION OF LIABILITY This Fluke product will be free from defects in material and workmanship for three years from the date of purchase. This warranty does not cover fuses, disposable batteries, or damage from accident, neglect, misuse, alteration, contamination, or abnormal conditions of operation or handling. Resellers are not authorized to extend any other warranty on Fluke’s behalf.
Table of Contents Title Introduction .................................................................................................................... How to Contact Fluke ..................................................................................................... Safety Information .......................................................................................................... How to Get Started .........................................................................................
789 Users Manual Power-Up Options ......................................................................................................... Loop Power Supply Mode .............................................................................................. Battery Life..................................................................................................................... Maintenance ................................................................................................................
List of Tables Table Title Page 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. International Symbols ............................................................................................................ Input/Output Jacks................................................................................................................. Rotary Function Switch Positions for Measurements ............................................................ Rotary Function Switch Positions for mA Output ...........
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List of Figures Figure Title Page 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. Fluke 789 ProcessMeter........................................................................................................ Input/Output Jacks................................................................................................................. Rotary Function Switch Positions for Measurements ............................................................ Rotary Function Switch Positions for mA Output .................
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ProcessMeter Introduction How to Contact Fluke Warning Read “Safety Information” before using the meter. The Fluke 789 ProcessMeter (referred to as “the meter”) is a handheld, battery-operated tool for measuring electrical parameters, supplying steady or ramping current to test process instruments, and providing a > 24 V loop power supply. It has all the features of a digital multimeter, plus current output capability.
789 Users Manual • Inspect the test leads for damaged insulation or exposed metal. Check test lead continuity. Replace damaged test leads before using the meter. • Do not use the meter if it operates abnormally. Protection may be impaired. When in doubt, have the meter serviced. • Do not operate the meter around explosive gas, vapor, or dust. • Do not use in a damp or wet environment. • Use only type AA batteries, properly installed in the meter case, to power the meter.
ProcessMeter™ Safety Information • Do not use AutoHold to determine if dangerous voltage is present. AutoHold will not capture unstable or noisy readings. • To avoid false readings, which could lead to possible electric shock or personal injury, replace the battery as soon as the battery indicator () appears. • Remove test leads from the meter before opening the battery door. • Close and latch the battery door before using the meter.
789 Users Manual Table 1. International Symbols Symbol Risk of danger. Important information. See Manual.
ProcessMeter™ How to Get Started How to Get Started If familiar with the Fluke 80 Series DMM, read “Using the Current Output Functions,” review the tables and figures in “Getting Acquainted with the Meter,” and begin using the meter. Display 789 PROCESSMETER If unfamiliar with Fluke 80 Series DMMs, or DMMs in general, read “Measuring Electrical Parameters” in addition to the sections referenced in the previous paragraph.
789 Users Manual Getting Acquainted with the Meter To become familiar with the features and functions of the meter, study the following figures and tables. • Figure 2 and Table 2 describe the input/output jacks. • Figure 3 and Table 3 describe the input functions of the first six rotary function switch positions. A 1 mA • Figure 4 and Tables 4 and 5 describe the output functions of the last three rotary function switch positions. • Figure 5 and Table 6 describe the functions of the pushbuttons.
ProcessMeter™ Getting Acquainted with the Meter Table 2. Input/Output Jacks Item Jack Measurement Functions Source Current Function Ac Input for current to 440 mA continuous. (1 A for up to 30 seconds.) Fused with a 440 mA fuse. Output for dc current to 24 mA. Output for loop power supply. mA d Input for current to 30 mA. Fused with a 440 mA fuse. Common for dc current output to 24 mA. Common for loop power supply.
789 Users Manual 5 4 mV 3 V 6 mA A 2 1 V mA OFF mA 250 HART LOOP POWER mA anw002f.eps Figure 3.
ProcessMeter™ Getting Acquainted with the Meter Table 3. Rotary Function Switch Positions for Measurements No.
789 Users Manual mV V mA A V 1 mA 2 mA OFF 3 250 HART LOOP POWER mA anw008f.eps Figure 4.
ProcessMeter™ Getting Acquainted with the Meter Table 4. Rotary Function Switch Positions for mA Output No. Position OUTPUT X Default Function Test leads in SOURCE: Source 0 % mA % STEP X or W: Adjusts output up or down to the next 25 % step COARSE X or W: Adjusts output up or down 0.
789 Users Manual 4 5 6 3 100% MIN MAX RANGE HOLD SpanCheck %STEP COARSE FINE 0% REL Hz 2 7 10 9 1 8 anw003f.eps Figure 5.
ProcessMeter™ Getting Acquainted with the Meter Table 6. Pushbuttons No.
789 Users Manual Table 6. Pushbuttons (cont.) No. G H Pushbutton FINE h J (BLUE) (alternate function) Function(s) Measuring: Toggles between frequency counter and voltage measurement functions mA Output: Adjusts output down 0.
ProcessMeter™ Getting Acquainted with the Meter 6 7 8 9 10 11 12 5 13 4 3 14 15 2 1 17 16 anw004f.eps Figure 6.
789 Users Manual Table 7. Display No.
ProcessMeter™ Getting Acquainted with the Meter Table 7. Display (cont.) No. Element M mA, DC, mV, AC, M or kΩ, kHz N Auto Range Manual Range 400100030 Meaning Show the input or output units and multipliers associated with the numerals Range status indicators: Auto Range - autoranging is on Manual Range - the range is fixed The number plus the unit and multiplier indicate the active range.
789 Users Manual Measuring Electrical Parameters The proper sequence for taking measurements follows: 1. Plug the test leads into the appropriate jacks 2. Set the rotary function switch to the desired function 3. Touch the probes to the test points 4. View the results on the LCD display Input Impedance For the voltage measurement functions, input impedance is 10 MΩ. See "Specifications" for more information.
ProcessMeter™ Measuring Electrical Parameters 6. The diode is good if it passes the tests in steps 4 and 5. Displaying Minimum, Maximum, and Average MIN MAX recording stores the lowest and highest measurements, and maintains the average of all measurements. Press M to turn on MIN MAX recording. Readings are stored until the meter is turned off, switched to another measurement or source function, or MIN MAX is turned off. The beeper sounds when a new maximum or minimum is recorded.
789 Users Manual Compensating for Test Lead Resistance Use the relative reading feature (Q on the display) to set the present measurement as a relative zero. A common use for this feature is to compensate for test lead resistance when measuring ohms. Select the Ω measure function, touch the test leads together, and then press r. Until r is pressed again, or the meter is switched to another measurement or source function, the readings on the display will subtract the lead resistance.
ProcessMeter™ Using the Current Output Functions 789 PROCESSMETER 40 20 0 100% MIN MAX RANGE HOLD SpanCheck %STEP COARSE FINE 0% REL mV 60 80 100 Hz mA A V V mA mA OFF 250 HART LOOP POWER mA A mA V COM CAT IV 600 V anw010f.eps Figure 7.
789 Users Manual Simulate Mode Changing the Current Span Simulate mode is so named because the meter simulates a current loop transmitter. Use simulate mode when an external dc voltage of 15 to 48 V is in series with the current loop under test. The meter’s current output span has two settings (with overrange to 24 mA): Caution Set the rotary function switch to one of the mA output settings BEFORE connecting the test leads to a current loop.
ProcessMeter™ Using the Current Output Functions dc V Power Supply 789 PROCESSMETER 40 COM +24V 20 0 100% MIN MAX RANGE HOLD SpanCheck %STEP COARSE FINE 0% REL mV 60 80 100 Hz mA A V V mA OFF mA 250 HART LOOP POWER mA A mA V COM CAT IV 600 V anw011f.eps Figure 8.
789 Users Manual Producing a Steady mA Output When the rotary function switch is in the OUTPUT [ mA position, and the OUTPUT jacks are connected to an appropriate load, the meter produces a steady mA dc output. The meter begins sourcing or simulating 0 %. Use the pushbuttons to adjust the current as shown in Table 8. Select either sourcing or simulating by choosing the SOURCE or SIMULATE output jacks.
ProcessMeter™ Using the Current Output Functions Table 8. mA Output Adjust Pushbuttons Pushbutton X R COARSE X M FINE FINE Adjustment Adjusts up 0.1 mA Adjusts up 0.001 mA Adjusts down 0.001 mA h W COARSE r W Adjusts down 0.1 mA Manually Stepping the mA Output When the rotary function switch is in the OUTPUT [ mA position, and the OUTPUT jacks are connected to an appropriate load, the meter produces a steady mA dc output. The meter begins sourcing or simulating 0 %.
789 Users Manual Table 9. mA Stepping Pushbuttons Pushbutton Adjustment X M Adjusts up to the next higher 25 % step G Adjusts down to the next lower 25 % step % STEP % STEP W Span Check Span Check Sets to 100 % value Sets to 0 % value Table 10. mA Step Values Value (for each span setting) Step 4 to 20 mA 0 to 20 mA 0% 4.000 mA 0.000 mA 25 % 8.000 mA 5.000 mA 50 % 12.000 mA 10.000 mA 75 % 16.000 mA 15.000 mA 100 % 20.000 mA 20.000 mA 125 % 24.000 mA 120 % 24.
ProcessMeter™ Power-Up Options When the rotary function switch is in the OUTPUT Ymonp position, and the output jacks are connected to an appropriate load, the meter produces a continuously repeating 0 % - 100 % - 0 % ramp in a choice of four ramp waveforms: m 0 % - 100 % - 0 % 40-second smooth ramp (default) o 0 % - 100 % - 0 % 15-second smooth ramp n 0 % - 100 % - 0 % Stair-step ramp in 25 % steps, pausing 15 seconds at each step. Steps listed in Table 10.
789 Users Manual Table 11. Power-Up Options Option Pushbutton Default Action Taken Change current span 0 % setting R Remembers last setting Toggles between 0 - 20 mA and 4 - 20 mA range Disable beeper G Enabled Disables beeper Disable auto power-off J (Blue) Enabled Disables the feature that turns off the meter power after 30 minutes of inactivity. Auto power off is disabled regardless of this option if MIN MAX recording is on.
ProcessMeter™ Loop Power Supply Mode Loop Power Supply Mode The meter supplies loop power at a nominal 24 V dc. An internal series resistance of 250 Ω can be switched in for communication with HART and other smart devices by pressing J (Blue). Pressing J (Blue) again switches out this internal resistance. When loop power is enabled, the meter is configured to measure mA and > 24 V dc is sourced between the mA and A jacks. The mA jack is the common and the A jack is at > 24 V dc.
789 Users Manual 789 PROCESSMETER 100% MIN MAX RANGE HOLD SpanCheck %STEP COARSE FINE 0% REL mV Hz mA A V TEST DC PWR – ++ – V mA OFF mA Red 250 HART LOOP POWER mA A mA + – V COM CAT IV 600 V Black anw009f.eps Figure 10.
ProcessMeter™ Battery Life Maintenance Battery Life Warning To avoid false readings, which could lead to possible electric shock or personal injury, replace the battery as soon as the battery indicator (b) appears. Table 12 shows typical alkaline battery life. To preserve battery life: • • • • Use current simulation instead of sourcing when possible. Avoid using the backlight. Do not disable the automatic power-off feature. Turn the meter off when not in use. Table 12.
789 Users Manual Replacing the Batteries 2. With a standard blade hand screwdriver, turn each battery door screw counterclockwise so that the slot is parallel with the screw picture molded into the case. 3. Lift off the battery door. 4. Remove the meter's batteries. 5. Replace with four new AA alkaline batteries. 6. Reinstall the battery door and tighten screws. ! Warning To avoid electrical shock: • Remove test leads from the meter before opening the battery door.
ProcessMeter™ General Maintenance F1 F2 anw037.eps Figure 11.
789 Users Manual If a fuse is blown, replace it as follows. Refer to Figure 11 as necessary: Replacing a Fuse ! Warning To avoid personal injury or damage to the meter, use only the specified replacement fuse, 440 mA 1000 V fast-blow, Fluke PN 943121. Both current input jacks are fused with separate 440 mA fuses. To determine if a fuse is blown: Turn the rotary function switch to 2. Plug the black test lead into COM, and the red test lead into the A c input.
ProcessMeter™ Replacement Parts and Accessories If the meter still does not work, contact a Fluke Service Center. If the meter is under warranty, it will be repaired or replaced (at Fluke’s option) and returned at no charge. See the Warranty on the back of the title page for terms. If the warranty has lapsed, the meter will be repaired and returned for a fixed fee. Contact a Fluke Service Center for information and price.
789 Users Manual 1 2 3 17 30 18 16 8 4 15 5 29 26 14 27 13 6 28 19 25 24 7 20 23 12 21 22 9 11 10 anw005f.eps Figure 12.
ProcessMeter™ Replacement Parts and Accessories Table 13. Replacement Parts Item Number Reference Designator Description Fluke PN or Model no.
789 Users Manual Table 13. Replacement Parts (continued) Item Number Reference Designator Description Q R S T U V W X Y Z a b c d MP50 Shock Absorber MP11 MP20 BT1-4 - Fluke PN or Model no. Quantity 878983 1 Bottom Case 659042 1 Battery Contact, Negative 658382 1 Battery, 1.
ProcessMeter™ Specifications The standard specification interval is 1 year. Specifications All specifications apply from +18 °C to +28 °C unless stated otherwise. All specifications assume a 5-minute warm-up period. Note “Counts” refers to the number of increments or decrements of the least significant digit. DC Volts Measurement Range (V dc) Resolution Accuracy, ±(% of Reading + Counts) 4.000 0.001 V 0.1 % + 1 40.00 0.01 V 0.1 % + 1 400.0 0.1 V 0.1 % + 1 1000 1V 0.
789 Users Manual DC Millivolts Measurement Range (mV dc) 400.0 Accuracy, ±(% of Reading + Counts) Resolution 0.1 mV 0.1 % + 2 AC Volts Measurement Range (ac) Resolution Accuracy, ±(% of Reading + Counts) 50 Hz to 60 Hz 200 Hz to 500 Hz 400.0 mV 0.1 mV 0.7 % + 4 1.2 % + 4 7.0 % + 4 4.000 V 0.001 V 0.7 % + 2 1.2 % + 4 7.0 % + 4 40.00 V 0.01 V 0.7 % + 2 1.2 % + 4 7.0 % + 4 400.0 V 0.1 V 0.7 % + 2 1.2 % + 4 7.0 % + 4 1000 V 1V 0.7 % + 2 1.2 % + 4 7.
ProcessMeter™ Specifications AC Current Measurement Range 45 Hz to 2 kHz Resolution 1.000 A (Note) 0.001 A Accuracy, ±(% of Reading + Counts) 1%+2 Typical Burden Voltage 1.5 V/A Note: 440 mA continuous, 1 A 30 seconds maximum Specifications are valid from 5 % to 100 % of amplitude range. AC conversion: true rms Maximum crest factor: 3 (between 50 and 60 Hz) For non-sinusoidal waveforms, add ±( 2 % reading + 2 % f.s.
789 Users Manual Ohms Measurement Range Resolution Accuracy, ±(% of Reading + Counts) 400.0 Ω 0.1 Ω 220 μA 0.2 % + 2 4.000 kΩ 0.001 kΩ 60 μA 0.2 % + 1 40.00 kΩ 0.01 kΩ 6.0 μA 0.2 % + 1 400.0 kΩ 0.1 kΩ 600 nA 0.2 % + 1 4.000 MΩ 0.001 MΩ 220 nA 0.35 % + 3 40.00 MΩ 0.01 MΩ 22 nA 2.5 % + 3 Overload protection: 1000 V Open circuit voltage: <3.
ProcessMeter™ Specifications Frequency Counter Accuracy Range Accuracy, ±(% of Reading + Counts) Resolution 199.99 Hz 0.01 Hz 0.005 % + 1 1999.9 Hz 0.1 Hz 0.005 % + 1 19.999 kHz 0.001 kHz 0.
789 Users Manual Diode Test and Continuity Test Diode test indication ........................................... Displays voltage drop across device, 2.0 V full scale. Nominal test current 0.2 mA at 0.6 V. Accuracy ±(2 % + 1 count). Continuity test indication ..................................... Continuous audible tone for test resistance <100 Ω Open circuit voltage ............................................ 2.9 V Short circuit current .............................................
ProcessMeter™ Specifications General Specifications Maximum voltage applied between any jack and earth ground .................................... 1000 V Battery Type ........................................................... 1.5 V, 0-15 mA, AA, Alkaline Storage temperature ............................................. -40 °C to 60 °C Operating temperature .......................................... -20 °C to 55 °C Operating altitude ..................................................
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