Fluke 789 ProcessMeter™ with 250 Ohm HART resistor

The Fluke 787 was the first tool to combine a DMM and a loop calibrator to give process technicians double the power in one tool.


Double Your Power

The Fluke 787 was the first tool to combine a DMM and a loop calibrator to give process technicians double the power in one tool. Now it’s even better, the range is extended with the new Fluke 789 – the ultimate loop calibration multimeter. The Fluke 789 has a 24-Volt loop supply reducing the need for taking a separate power supply when doing offline transmitter testing. And with its built-in, selectable 250-Ohm Hart® resistor, it also eliminates the need to carry a separate resistor with you. Now process technicians can do a lot more while carrying a lot less.

Features of the Fluke 789

  • 24 V Loop power supply
  • Very large dual display
  • Enhanced backlight with 2 brightness settings
  • 1200 Ohm drive capability on mA source
  • HART mode setting with loop power and a built-in 250 ohm resistor
  • 0% and 100 % buttons to toggle between 4 and 20 mA sourcing for a quick span check
  • Externally accessible fuses for easy replacement
  • Infrared-port to process data in FlukeView Forms (V2.1) software
  • Fluke 789 features that are also included in the Fluke 787
  • Precision 1000 V, 440 mA True-RMS digital Multimeter
  • 0.1% dc voltage accuracy
  • 0.05% dc current accuracy
  • Frequency measurement to 20 kHz
  • Min/Max/Average/Hold/Relative modes
  • Diode Test and Continuity Beeper
  • Simultaneous mA and % of scale readout
  • 20 mA DC current source / loop calibrator / simulator
  • Manual Step (100%, 25%, Coarse, Fine) plus Auto Step and Auto Ramp
  • Externally accessible battery for easy battery changes


Safety Conformance

Meets 1000 Volt EN61010-1 CAT III standards and 600 Volt EN61010-1 CAT IV standards.





Current Measurement
Range:  0-1 A AC or DC
Resolution:  1 mA
Accuracy:  0.2% + 2 LSD (DC)
Range:  0-30 mA
Resolution:  0.001 mA
Accuracy:  0.05% + 2 LSD
Current Sourcing
Range:  0-20 mA or 4-20 mA
Resolution:  0.05% of span
Drive Capability:  24 V Compliance or 1200 Ω @ 20 mA
   to 19.999 kHz, 0.005% + 1 LSD
   Beeps for resistance < 100 Ω
Voltage measurement
Range:  0-1000 V AC (true-rms) or DC
Resolution:  0.1 mV to 1.0 V
Accuracy:  0.1% Rdg + 1 LSD (VDC)
Resistance measurement
   to 40 MΩ, 0.2% + 1 LSD
Diode test
   2.0 V shows diode voltage drop
Display current and % of span
Auto step, auto ramp

Environmental Specifications

Operating Temperature
   -20 ºC to 55 ºC
Storage Temperature
    -40 ºC to 60 ºC
Humidity (Without Condensation)
   95% up to 30 ºC
   75% up to 40 ºC
   45% up to 50 ºC
   35% up to 55 ºC
Temperature Coefficient
   0.05 x (specified accuracy) per ºC (for temperatures < 18 ºC or > 28 ºC)

Safety Specifications

Electrical Safety
   Designed in accordance with IEC 1010-1, ANSI/ISA S82.01-1994 and CAN/CSA C22.2 No. 1010.1-92
Overvoltage category
   IEC 1010-1 CAT III 1000 V
   IEC 1010-1 CAT IV 600 V
Maximum voltage
   1000 V rms

Mechanical & General Specifications

   50 x 100 x 203 mm (1.25" H x 3.41"W x 7.35" L)
   610 g (1.6 lbs)
   4 AA Alkaline batteries
   3 years
Battery Life
   140 hours typical (measurement), 10 hours typical (sourcing 20 mA)
Shock & Vibration
   Random, 2 g, 5-500 Hz
   1 meter drop test



Model Name


Fluke 789


  • AC72 Alligator Clips
  • Four AA 1.5 V alkaline battery (installed)
  • TL71 Safety-Designed Test lead Set
  • Users Manual and Quick Reference Guide


Accessories common to all models:




  • GOLD CarePlan.
  • Models covered: 51-2, 52-2, 53-2, 54-2, 192C, 381, 705, 707, 712, 714, 715, 717, 718, 719, 744, 787, 789, 1550C, 1577, and 1587.
  • Extends warranty from three to five years and includes five annual NIST traceable calibrations with data.
  • SILVER CarePlan.
  • Models covered: 51-2, 52-2, 53-2, 54-2, 192C, 381, 705, 707, 712, 714, 715, 717, 718, 719, 744, 787, 789, 1550C, 1577, and 1587.
  • Extends warranty from three to five years.
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