Two Professional Tools Combined into One
The Fluke 789 ProcessMeter™ is designed for electrical and instrumentation professionals who need to maintain industrial process systems.
It combines:
- A full-featured True-RMS digital multimeter
- A 4-20 mA loop calibrator
- A 24 V loop power supply
- Process troubleshooting functions
By combining multiple instruments into one handheld device, technicians can reduce the amount of equipment required for field maintenance.
Complete 4-20 mA Loop Troubleshooting Solution
Most industrial transmitters use 4-20 mA signals for communication with control systems.
The Fluke 789 allows technicians to:
- Measure loop current
- Source 4-20 mA signals
- Simulate transmitter output
- Verify control system response
- Troubleshoot signal problems
This makes it suitable for maintaining:
- Pressure transmitters
- Temperature transmitters
- Flow transmitters
- Level transmitters
- Control valves
Built-In 24 V Loop Power for Offline Testing
Testing a transmitter often requires an external power source.
The Fluke 789 includes a built-in selectable 24 V loop supply, allowing technicians to power transmitters during offline testing without carrying an additional power supply.
Benefits include:
- Faster transmitter verification
- Reduced equipment needed
- Easier field troubleshooting
Measure, Source and Simulate Current Signals
The Fluke 789 supports complete current loop testing.
It can:
- Measure 4-20 mA signals
- Source 0-20 mA or 4-20 mA outputs
- Simulate transmitter current signals
- Display mA value and percentage of span simultaneously
The built-in SpanCheck function allows quick switching between 0% and 100% output values for faster calibration checks.
Built-In 250 Ω HART Resistor
Many smart transmitters require a 250 Ω resistance for HART communication.
The Fluke 789 includes a selectable built-in 250 Ω HART resistor, eliminating the need to carry a separate resistor during transmitter testing.
This simplifies troubleshooting of HART-compatible process loops.
Full-Function True-RMS Digital Multimeter
Besides process calibration functions, the Fluke 789 operates as a professional digital multimeter.
Measurement functions include:
- AC/DC voltage
- AC/DC current
- Resistance
- Frequency
- Continuity
- Diode testing
The meter supports voltage measurements up to 1000 V AC/DC and provides True-RMS measurement capability for reliable readings on complex electrical signals.
Dual Display Improves Troubleshooting Efficiency
During loop calibration, engineers often need to compare output and measurement values at the same time.
The Fluke 789 dual display can show:
- mA measurement
- Percentage of span
- Source value
This allows faster adjustment and verification of process instruments.
Designed for Industrial Field Applications
The Fluke 789 is built for demanding industrial maintenance environments.
Typical applications include:
- Process instrumentation maintenance
- Control loop testing
- Industrial electrical troubleshooting
- Transmitter verification
- Automation system maintenance
Safety ratings include:
- CAT III 1000 V
- CAT IV 600 V
Key Features
- Combines digital multimeter and mA loop calibrator
- Measures, sources, and simulates 4-20 mA signals
- Built-in 24 V loop power supply
- Selectable 250 Ω HART resistor
- True-RMS AC voltage measurement
- Measures up to 1000 V AC/DC
- mA and % span dual display
- Auto Step and Auto Ramp functions
- Min/Max/Average/Hold modes
- Frequency measurement up to 20 kHz
- CAT III 1000 V / CAT IV 600 V safety rating
- Compatible with Fluke Connect wireless logging using optional module
Technical Highlights
- DC Current Measurement: 0-30 mA
- Current Source: 0-20 mA / 4-20 mA
- Current Source Accuracy: 0.05% of span
- Loop Power: 24 V
- Drive Capability: 1200 Ω at 20 mA
- Voltage Measurement: Up to 1000 V AC/DC
- Resistance: Up to 40 MΩ
- Frequency: Up to 20 kHz
- Safety Rating: CAT III 1000 V / CAT IV 600 V
- Battery: 4 × AA batteries
- Battery Life: Approx. 140 hours (measurement)
Typical Applications
Process Transmitter Testing
Used for:
- Pressure transmitter troubleshooting
- Flow transmitter verification
- Temperature transmitter testing
- Level transmitter maintenance
Control Loop Maintenance
Suitable for checking:
- PLC analog inputs
- DCS systems
- 4-20 mA loops
- Industrial automation circuits
Electrical Troubleshooting
Can be used for:
- Voltage measurement
- Current testing
- Signal verification
- Equipment diagnostics
FAQ
What is the Fluke 789 ProcessMeter?
The Fluke 789 is a combined digital multimeter and mA loop calibrator designed for industrial electrical and instrumentation troubleshooting.
Can Fluke 789 calibrate 4-20 mA transmitters?
Yes. It can measure, source, and simulate 4-20 mA signals for transmitter and control loop testing.
Does Fluke 789 provide loop power?
Yes. It includes a built-in 24 V loop supply for offline transmitter testing.
What is the difference between Fluke 789 and Fluke 754?
Fluke 789 focuses on fast field troubleshooting of electrical signals and current loops. Fluke 754 adds HART communication and advanced documenting calibration functions.
Can Fluke 789 replace a normal multimeter?
Yes. It includes full digital multimeter functions including voltage, current, resistance, frequency, and continuity measurement.
Is Fluke 789 suitable for pressure transmitters?
Yes. It can test pressure transmitters by verifying their 4-20 mA output signal when used with appropriate pressure calibration equipment.
