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Yellow Fluke 789 ProcessMeter handheld with LCD backlight

Fluke

Fluke 789 ProcessMeter measurement tool

SKU CH-VBFZ-T2N5B

Measures, sources and simulates 4-20 mA signals with a built-in 24 V loop supply and 250 Ohm Hart resistor

  • 1000 V overload protection on volts, ohms and frequency
  • 24 V loop supply powers transmitters without external source
  • 50 hours typical measurement time on one 9 V alkaline battery
  • 25 % manual step plus auto step and auto ramp on mA output
  • 0 % and 100 % buttons toggle between 4 and 20 mA for quick span check

Fluke 789 ProcessMeter for loop testing

The Fluke 789 ProcessMeter combines standard digital multimeter functions with the ability to measure, source and simulate 4-20 mA signals. A built-in 24 V loop supply powers the circuit during testing. It is suited for technicians who maintain process instrumentation in the field.

Practical limits of the 4-20 mA interface

Current measurement covers 0 to 30 mA DC with 150 V overload protection on the mA terminals, backed by a 440 mA 1000 V fuse. Voltage, resistance and frequency inputs withstand 1000 V overload. Sourcing 12 mA typically runs for 12 hours on one 9 V alkaline battery, while measurement alone reaches about 50 hours.

Build quality and daily connector implications

A clear LCD with backlight remains readable in low light. Manual 25-percent step, auto step and auto ramp functions speed up mA output adjustments. A selectable 250-Ohm Hart resistor is built in. Dedicated 0 and 100-percent buttons toggle between 4 and 20 mA sourcing for quick span checks without menu navigation.

Highlights

  • 1000 V overload protection on volts, ohms and frequency
  • 24 V loop supply powers transmitters without external source
  • 50 hours typical measurement time on one 9 V alkaline battery
  • 25 % manual step plus auto step and auto ramp on mA output
  • 0 % and 100 % buttons toggle between 4 and 20 mA for quick span check

Specifications

No published specifications for this item yet.

Questions about this item

Should I choose the 4 mA or 20 mA sourcing mode for a quick span check?

Use the 0 % and 100 % buttons to toggle between 4 mA and 20 mA sourcing for a quick span check.

What does the 30 mA DC current measurement range mean when I am testing a live loop?

You can measure 0 to 30 mA DC directly in the loop without an external shunt.

How does the 24 V loop supply interact with the built-in 250 Ohm HART resistor?

The selectable 250 Ohm HART resistor is built in and works with the 24 V loop supply for HART communication.

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