FLUKE 789/E Process MeterFLUKE 789/E is a process measurement and loop calibration tool (ProcessMeter) that combines a digital multimeter and a mA current loop calibrator in one compact device. The device is designed for professional troubleshooting of electrical and automatic systems, measurement of process signals, calibration, and testing of loop (4...20 mA) connections without additional tools. :contentReference[oaicite:0]{index=0}

Technical characteristics* Manufacturer: Fluke * Model: 789/E * Device type: ProcessMeter (multimeter + mA loop calibrator) * Power supply: 4 × AA alkaline batteries * Safety class: IEC CAT III 1000 V / CAT IV 600 V * Display: dual LCD with adjustable backlight * Temperature range: −20 °C to +55 °C (operating), −40 °C to +60 °C (storage)Voltage measurement-
Range: 0…1000 V
AC/DC- Accuracy (DC): ±0.1% + 1 digit-
True-RMS measurement AC-
Resolution: 0.1 mV…1 V :contentReference[oaicite:1]{index=1}

Current measurement and source
- DC/AC current: 0…1 A
- mA current: 0…30 mA (current measurement)
- mA source/simulation: 0…20 mA or 4…20 mA
- mA source resistance: 24 V loop or 1200 Ω @ 20
mA- Accuracy DC current: ±0.05% + 2 digits :contentReference[oaicite:2]{index=2}

**Other measurements** - Frequency: up to 19.999 kHz - Resistance measurement

up to 40 MΩ - Diode test - Continuity test with audible signal
- Min/Max/Average/Hold/Relative modes :contentReference[oaicite:3]{index=3}

Loop calibration functions
- Built-in 250 Ω HART resistor
- 0% / 100% buttons for quick 4…20 mA range check
- Auto Step and Auto Ramp functions :contentReference[oaicite:4]{index=4}

Physical data
- Dimensions: ~203 × 100 × 50 mm
- Weight: ~610 g
- Humidity tolerance: up to 95% without condensation :contentReference[oaicite:5]{index=5}

Application* mA current loop fault diagnosis * Transmitter and sensor calibration * Testing of electrical and automatic systems * Resistance, voltage, current, and frequency measurements