Fluke ProcessMeter™ test tools: Multimeter and loop calibrator all in one
Before comparing the differences of the Fluke 787 vs 789, let’s consider the similarities. Both the Fluke 787B and 789 ProcessMeter™ are handheld tools that combines the power of a 1000 volt CAT III/600 V CAT IV safety-rated digital multimeter with a full-featured mA loop calibrator. Both double your troubleshooting capabilities. Both ProcessMeters are based on the measurement capabilities of the tried and true Fluke 87 digital multimeter, with the added ability to measure, source, and simulate mA. These tools were also designed with the accuracy and resolution you would expect from a Fluke mA loop calibrator, giving you the ideal tool for troubleshooting and calibrating current loop applications.
The Fluke 787 and 789787 vs 789 features
Separating out the features of the Fluke 787B and the 789 ProcessMeters shows a few differences between their capabilities. While both tools can measure AC and DC volts, AC and DC current, resistance, continuity, and frequency, only the 789 offers a 20mA current source/simulate, simultaneous mA and % scale readout, and 24 V loop power supply.
| 787B | 789 | |||
|---|---|---|---|---|
| DMM and Loop Calibrator in one tool | X | X | ||
| Precision 1000 V, True RMS Digital Multimeter | X | X | ||
| DC current source and Loop Calibrator | X | X | ||
| 24 V Loop power supply | X | |||
| Min/Max / Average / Hold / Relative Modes | X | X | ||
| Diode Test and Continuity Beeper | X | X | ||
| Manual Step (100%, 25%, Coarse, Fine) plus Auto Step and Auto Ramp | X | X | ||
| Simultaneous mA and % of scale read-out | X | X | ||
| Externally accessible battery | X | X | ||
| Externally accessible fuses | X | |||
| HART mode setting with loop power and a built-in 250 Ω resistor | X | |||
| 0% and 100% buttons to toggle between 4 and 20 mA sourcing for a quick span check | X | |||
| Infrared I/O serial port | X | |||
| Fluke Connect enabled | X | X | ||
Fluke 787B ProcessMeter™ Test Tool
- Simultaneous mA and % of scale readout on mA output
- 25% manual step plus auto step and auto ramp on mA output
- 1000 volt CAT III/600 V CAT IV safety rated DMM
- Measure volts, amps, resistance, and frequency
- 0% to 100% mA Span Check buttons to toggle from 4 mA to 20 mA
- Infrared I/O serial port compatible with FlukeView® Software
- 20 mA drive capable into 1200 Ω
Fluke 789 ProcessMeter™ Test Tool
- Includes the features of the 787B plus
- 24 V loop power supply
- HART mode setting with loop power (adds 250 ohm resistor)
787 vs 789 specifications
While the two meters are similar, there are a few differences between the specs. The Fluke 787B price offers a bit more cost savings than the Fluke 789 price, as the 789 includes a few additional features and expanded specifications over the 787B.
| 787B | 789 | |
|---|---|---|
| Product specs | ||
| Maximum voltage | 1000 V RMS | 1000 V RMS |
| Operating temperature | -20 to 55ºC | -20 to 55ºC |
| Voltage measurements | ||
| Range | 0-1000 V AC or DC | 0-1000 V AC or DC |
| Resolution | 0.1 mV to 1.0 V | 0.1 mV to 1.0 V |
| Accuracy | 0.1% Rdg+1 LSD (V DC) | 0.1% Rdg+1 LSD (V DC) |
| Current Measurement | ||
| Range | 0-1 A 0-30 mA | 0-1 A 0-30 mA |
| Resolution | 1 mA 0.001 mA | 1 mA 0.001 mA |
| Accuracy | 0.2%+2 LSD 0.05%+2 LSD | 0.2%+2 LSD 0.05%+2 LSD |
| Current Sourcing | ||
| Range | 0-20 mA or 4-24 mA | 0-20 mA or 4-24 mA |
| Accuracy | 0.05% of span | 0.05% of span |
| Other specifications | ||
| Max drive capability | 1200 Ω | 1200 Ω |
| Loop power | N/A | 24 V |
| Resistance measurement | To 40 MΩ, 0.2%+1 LSD | To 40 MΩ, 0.2%+1 LSD |
| Frequency | To 19.999 kHz, 0.005%+1 LSD | To 19.999 kHz, 0.005%+1 LSD |
| Continuity | Beeps for resistance < 100 Ω | Beeps for resistance < 100 Ω |
| Span check | No | Yes |
| Handheld tool | ||
| Size (HxWxD) | 203 mm x 100 mm x 50 mm | 203 mm x 100 mm x 50 mm |
| Weight | 0.6 kg | 0.6 kg |
| Battery | Four AA alkaline | Four AA alkaline |
| Battery life | 14 to 140 hours typical | 14 to 140 hours typical |
For more detailed information on the features and specifications offered by both products, check out the Fluke 787 manual and the Fluke 789 manual under the “Resources” tab on the product pages.