The 789 also has a Ramping function that allows you to Ramp the milliamp signal into the indicator, or other input device at one location and go to the device and check for an appropriate response, such as a valve stem indicator change or mode indicator of a control system. In the Milliamp function, the built-in loop calibrator sources a 4-20 milliamp signal to test devices with a 4-20 Amp input such as a PLC I/O or analogue milliamp indicator. The FLUKE 789 Process Meter is a combination of a 4-20 milliamp loop calibrator and a CAT IV to 600-Volts safety rated Digital Multimeter (DMM) with an impressive display. The FLUKE 789 is the ultimate troubleshooting tool for electricians and instrumentation professionals. Diode test indication: displays voltage drop acroos device 2.0V full scale 0.2mA nominal test current at 0.Designed to help keep your process up and running!.Minimum sensitivity DC (RMS Sinewave) 5Hz to 5kHz: 150mV / 1V / 4V / 40V / 400V.Minimum sensitivity AC (RMS Sinewave) 5Hz to 5kHz: 150mV (50Hz to 5kHz) / 1V / 4V / 40V / 400V.Typical burden voltage: 14mV/mA / 1.5V/A.It comes supplied with red/black test leads, test probes and crocodile clips alongside product documentation. In terms of safety, an indication of dangerous voltage is shown on screen and the inputs are rated Cat III to 1000V and Cat IV to 600V so the user can have confidence when using the device. The user interface has clearly labelled push buttons and a simple dial so the measurement parameter or loop calibration mode are displayed both on screen and by the dial. Two brightness settings for the Fluke 789’s large, dual display allow adjustment for light levels and all readings are clearly shown. Furthermore, the HART mode and integrated 250Ω resistor negate the requirement to carry a separate resistor. The 0% and 100% buttons allow the user to toggle between 4 and 20mA for both sourced and simulated current for speedy span checking and there are several different options for ramping and stepping including auto-ramp and auto-step as well as four different manual step options. Firstly the 24V loop power supply means there is no need for a separate power source and a DC test current of between 0 and 20mA can be forced through resistance of up to 1200Ω. The loop calibration capabilities of the Fluke 789 are arguably even more impressive than the multimeter functions. True RMS measurement improves the accuracy of readings for AC values and further flexibility is given by a choice between automatic and manual ranging. Relative mode produces a relative zero reading which permits, for example, compensation for test lead resistance during resistance measurement. When using the device as a multimeter, the user can use min/max/avg recording and data hold which maintains stable readings on screen. Parameters are accurately measured to high resolutions including to ♚ for current. It offers precision measurement of AC/DC voltage (1000V), AC/DC current (440mA, 1A for 30s max), resistance (40MΩ), and frequency (20kHz) in addition to continuity and diode testing. The Fluke 789 Process Meter is a sophisticated device that features the measurement functions of a digital multimeter alongside the system-testing functions of a loop calibrator.
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