The Vanguard TRM-40 is the third generation transformer winding resistance meter. The TRM-40 is designed specifically to measure DC resistance values of transformer windings, rotating machine windings, or any DC resistance of an inductive device. The TRM-40 features dual resistance-reading input channels that can measure two winding resistances simultaneously (primary and secondary windings of a transformer). It can provide a fast and stable reading of very large transformers by utilizing a 60V DC power supply. The TRM-40 is capable of outputting a selectable test current from 1A to 40A. Since the TRM-40 can accurately measure resistance values from 1 micro-ohm to 500 ohms, it can be used as micro-ohm meters to measure EHV circuit breaker contact resistance, or for any low resistance measuring application. The TRM-40 can automatically demagnetize the inductive device under test, eliminating the manual task of demagnetizing the transformer core after a resistance test.
The TRM-40 features:
-Auto-discharge circuit for operator safety
-Demagnetizes transformer after test
-Selectable test current from 1A to 40A
-RS-232C, USB, and Bluetooth computer interfaces
-Built-in thermal printer