The Fluke 772 loop meter adds to the basic capabilities of the Fluke 771 to save more time and expand its applications. With the 771, you'll also be able to: source and simulate 4-20 mA signals for testing control system I/O; measure 4-20 mA signals with in-circuit measurement; power a transmitter with the 24 V loop power supply; and automatically ramp and step change the 4-20 mA output for remote testing. You'll be able to test 4–20 mA signals five times faster than with traditional DMMs, and without breaking the loop. That means you can troubleshoot a live device without having to power down, which can save you time, and help you avoid possibly missing something going on in the process. Other useful features Simulates 4-20 mA signals for testing control system I/O Sources 4 to 20 mA signals for testing control system I/O or I/Ps Measures 4 to 20 mA signals with in-circuit measurement Includes simultaneous mA in-circuit measurement with 24V loop power for powering and testing transmitters Features a detachable clamp with extension cable for measurements in tight locations Captures and displays changing measurements with Hold function Offers mA output linear ramp or 25% step output Extends battery life with auto-off and backlight timeout Dual backlit display with both mA measurement and percent of 4 to 20 mA span Measurement Spotlight to illuminate hard to see wires in dark enclosures Measures 10 to 50 mA signals in older control systems using the 99.9 mA range Automatically changes the 4 to 20 mA output for remote testing Specifications Diameter of measurable conductor 0.177” or 4.5 mm max Operating temperature -10 to 50ºC Storage temperature -25 to 60ºC Operating humidity < 90% @ 28ºC) Power, battery life (4) AA 1.5 V Alkaline, IEC LR6, 12 hours in mA source into 500 ohms Warranty Three years for electronicsOne year for cable and clamp assembly Functional Specifications mA measurement(measured by clamp) Resolution / range 0 to 20.99 mA Accuracy 0.2% + 5 counts Resolution / range 21.0mA to 100.0 mA Accuracy 1% + 5 counts mA measurement (measured in series with test jacks) Resolution / range 0 to 24.00 mA Accuracy 0.2% + 2 counts mA source (maximum mA drive: 24 mA into 1,000 ohms) Resolution / range 0 to 24.00 mA Accuracy 0.2% + 2 counts mA simulate (maximum voltage 50 V dc) Resolution / range 0 to 24.00 mA Accuracy 0.2% + 2 counts