789/787B ProcessMeter™ Users Manual August 2002, Rev. 4, 1/17 © 2002-2017 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 .........................................................................................
789/787B Users Manual Power-Up Options ......................................................................................................... Loop Power Supply Mode (789 only) ............................................................................. Battery Life..................................................................................................................... Maintenance .................................................................................................................
ProcessMeter Introduction Warning Read “Safety Information” before using the meter. The Fluke 789/787B ProcessMeter (the Meter or Product) is a handheld, battery-operated tool for measuring electrical parameters and supplying steady or ramping current to test process instruments. All illustrations in this manual show the 789 model. If the meter is damaged or something is missing, contact the place of purchase immediately.
789/787B Users Manual How to Contact Fluke Safety Information To contact Fluke, call one of the following telephone numbers: A Warning identifies conditions and procedures that are dangerous to the user. A Caution identifies conditions and procedures that can cause damage to the Product or the equipment under test.
ProcessMeter™ Safety Information • The battery door must be closed and locked before you operate the Product. • Measure a known voltage first to make sure that the Product operates correctly. • Replace the batteries when the low battery indicator shows to prevent incorrect measurements. • Use the correct terminals, function, and range for measurements. • • Comply with local and national safety codes.
789/787B Users Manual • Keep fingers behind the finger guards on the probes. • Only use probes, test leads, and accessories that have the same measurement category, voltage, and amperage ratings as the Product. • • • 4 Remove all probes, test leads, and accessories before the battery door is opened. Remove all probes, test leads, and accessories that are not necessary for the measurement.
ProcessMeter™ Safety Information Table 1. International Symbols Symbol Description Symbol Description WARNING. HAZARDOUS VOLTAGE. Risk of electric shock. WARNING. RISK OF DANGER. Consult user documentation. Conforms to relevant South Korean EMC Standards Conforms to European Union directives Minimum fuse interrupt rating. Certified by CSA Group to North American safety standards. Conforms to relevant Australian Safety and EMC standards.
789/787B Users Manual How to Get Started Warning To prevent possible electrical shock, fire, or personal injury: • Disconnect power and discharge all highvoltage capacitors before you measure resistance, continuity, capacitance, or a diode junction. 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.
ProcessMeter™ Getting Acquainted with the Meter Table 2. 789/787B ProcessMeter Getting Acquainted with the Meter To become familiar with the features and functions of the meter, study these tables: 1 3 2 0% • Table 3 describes the input/output jacks. • Table 4 describes the input functions of the first six rotary function switch positions. • Table 5 describes the output functions of the last three rotary function switch positions. • Table 6 describes the functions of the pushbuttons.
789/787B Users Manual Table 3. Input/Output Jacks 1 mA A COM V 2 3 4 anw001f.eps Item 8 Jack Measurement Functions Ac Input for current to 440 mA continuous. (1 A for up to 30 seconds.) Fused with a 440 mA fuse. mA d Input for current to 30 mA. Fused with a 440 mA fuse. V COM Source Current Function Output for dc current to 24 mA. Output for loop power supply (789 only). Common for dc current output to 24 mA. Common for loop power supply.
ProcessMeter™ Getting Acquainted with the Meter Table 4. Rotary Function Switch Positions for Measurements 5 4 3 6 2 1 anw002f.eps No.
789/787B Users Manual Table 4. Rotary Function Switch Positions for Measurements (cont.) No.
ProcessMeter™ Getting Acquainted with the Meter Table 5. Rotary Function Switch Positions for mA Output 1 2 3 anw008f.eps No. Position OUTPUT X Default Function Pushbutton Actions Test leads in % STEP X or W: Adjusts output up or down to the next 25 % step SOURCE: COARSE X or W: Adjusts output up or down 0.1 mA Source 0 % mA FINE X or W: Adjusts output up or down 0.
789/787B Users Manual Table 5. Rotary Function Switch Positions for mA Output (cont.) No.
ProcessMeter™ Getting Acquainted with the Meter Table 6. Pushbuttons 4 3 100% 5 MIN MAX RANGE No. Pushbutton K Set the backlight to low, high, and off Span Check mA Output: Adjusts mA output to 0 % value (4 mA or 0 mA) 6 HOLD 0% REL Hz Span Check 2 7 1 10 M % STEP 9 8 anw003f.
789/787B Users Manual Table 6. Pushbuttons (cont.) No. Pushbutton H FINE FINE h Function Measuring: Toggles AutoHold, or in MIN MAX recording, suspends recording mA Output: Adjusts output up 0.001 mA Measuring: Toggles between frequency counter and voltage measurement functions mA Output: Adjusts output down 0.
ProcessMeter™ Getting Acquainted with the Meter Table 7. Display 8 7 11 9 12 10 6 5 13 4 3 14 15 2 1 17 16 anw004f.eps No.
789/787B Users Manual Table 7. Display (cont.) Meaning No.
ProcessMeter™ Getting Acquainted with the Meter Table 7. Display (cont.) No. Element Auto Range Manual Range 400100030 Meaning 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.
789/787B Users Manual Measuring Electrical Parameters The proper sequence for taking measurements is: 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 The meter normally selects the lowest range that will measure the applied input signal (Auto Range showing on the display). Press R to lock the range.
ProcessMeter™ Measuring Electrical Parameters 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. Auto power-off is disabled and auto ranging is turned off during MIN MAX recording.
789/787B 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% 0% MIN MAX RANGE REL 60 80 100 HOLD Hz anw010f.eps Figure 1.
789/787B 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 COM 789 PROCESSMETER 40 +24V 20 0 100% 0% MIN MAX RANGE REL 60 80 100 HOLD Hz anw011f.eps Figure 2.
789/787B 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 9. mA Stepping Pushbuttons 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 %. Use the pushbuttons to step the current up and down in 25 % increments as shown in Table 9. See Table 10 for mA values at each 25 % step.
789/787B Users Manual Auto Ramping the mA Output Auto ramping gives the ability to continuously apply a varying current stimulus from the meter to a transmitter, while hands remain free to test the response of the transmitter. Select either sourcing or simulating by choosing the SOURCE or SIMULATE jacks.
ProcessMeter™ Power-Up Options Table 11. Power-Up Options Option Button Switch Position Default Display Action Taken Current Span R All Retains setting - or - Toggles between 0-20 mA and 4-20 mA range Backlight Timeout K All Retains setting / Enables/Disables the auto-off on backlight after 2 minutes Beeper G All Retains setting / Enables/Disables beeper All Enabled Disables the feature that turns off the power after 30 minutes of inactivity.
789/787B Users Manual Loop Power Supply Mode (789 only) 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). See Figure 3. 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.
ProcessMeter™ Loop Power Supply Mode (789 only) 789 100% 0% PROCESSMETER MIN MAX RANGE REL HOLD Hz TEST DC PWR – ++ – + – anw009f.eps Figure 4.
789/787B Users Manual Battery Life Maintenance 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.
ProcessMeter™ Maintenance Calibration 3. Lift off the battery door. Calibrate the meter once a year to ensure that it performs according to its specifications. Contact a Fluke Service Center for instructions. 4. Remove the meter's batteries. 5. Replace with four new AA alkaline batteries. Replacing the Batteries 6. Reinstall the battery door and tighten screws. Warning For safe operation and maintenance, repair the Product before use if the battery leaks. To replace the batteries: 1.
789/787B Users Manual F2 F1 anw037.eps Figure 5.
ProcessMeter™ Maintenance 5. 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. If a fuse is blown, replace it as follows. Refer to Figure 6 as necessary: 1. Remove the test leads from the meter and turn the meter OFF. 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.
789/787B Users Manual If the Meter does not Work • Examine the case for physical damage. If there is damage, make no further attempt to use the meter, and contact a Fluke Service Center. • Check the battery, fuses, and test leads. • Review this manual to make sure you are using the correct jacks and rotary function switch position. If the meter still does not work, contact a Fluke Service Center.
ProcessMeter™ Replacement Parts and Accessories 24 1 9 2 18 19 25 26 13 3 2x 2x W 10 11 4 4x 14 12 27 28 2x 2x 15 5 20 21 16 29 22 6 7 8 4x 2x 17 23 3x anw038.eps Figure 6.
789/787B Users Manual Table 13.
ProcessMeter™ Replacement Parts and Accessories Table 13. Replacement Parts (cont.) Item Number [1] Description Fluke PN for 789 Fluke PN for 787B Quantity Bottom Insulator 4811256 Bottom Shield 1675171 1 Shock Absorber 878983 1 IR Lens 658697 1 Bottom Case 659042 1 4772662 1 Case Screws 1558745 4 Battery, 1.
789/787B Users Manual 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 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.
ProcessMeter™ Specifications DC Millivolts Measurement Range (mV dc) 400.0 Accuracy, ±(% of Reading + Counts) Resolution 0.1 mV 0.1 % + 2 AC Volts Measurement Accuracy, ±(% of Reading + Counts) Range (ac) Resolution 50 Hz to 60 Hz 45 Hz to 200 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.
789/787B Users Manual 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.
ProcessMeter™ Specifications Ohms Measurement Range Resolution Measurement Current Accuracy, ±(% of Reading + Counts) 400.0 Ω 0.1 Ω 310 μA 0.2 % + 2 4.000 kΩ 0.001 kΩ 31 μA 0.2 % + 1 40.00 kΩ 0.01 kΩ 2.5 μA 0.2 % + 1 400.0 kΩ 0.1 kΩ 250 nA 0.2 % + 1 4.000 MΩ 0.001 MΩ 250 nA 0.35 % + 3 40.00 MΩ 0.01 MΩ 125 nA 2.5 % + 3 Overload protection: 1000 V Open circuit voltage: <3.
789/787B Users Manual 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.
ProcessMeter™ Specifications Diode Test and Continuity Test Diode test indication ........................................... Displays voltage drop across device, 2.0 V full scale. Nominal test current 0.3 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 .............................................
789/787B Users Manual General Specifications Maximum Voltage between any Terminal and Earth Ground ........................... 1000 V Fuse Protection for mA inputs ............................................................... 0.44 A, 1000 V, IR 10 kA Power Battery Type ........................................................ IEC LR6 (AA Alkaline) Quantity ............................................................... 4 Temperature Operating ............................................................
ProcessMeter™ Specifications Electromagnetic Compatibility (EMC) ................. Accuracy for all ProcessMeter functions is not specified in RF field >3 V/m International......................................................... IEC 61326-1: Portable Electromagnetic Environment; IEC 61326-2-2 CISPR 11: Group 1, Class A Group 1: Equipment has intentionally generated and/or uses conductively-coupled radio frequency energy that is necessary for the internal function of the equipment itself.
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