Vanguard Instrument Transformer Resistance Meter

The TRM-203 and TRM-403 are three phase transformer winding resistance meters that allow the user to connect all test cables to the transformer bushings. The unit will then measure the transformer resistance value for each of the phases without the need to disconnect and reconnect cables for each phase User Interface The TRM-203/403 features a back-lit graphic LCD screen (240 x 128 pixels) that is clearly visible in both bright sunlight and low light levels. A 44- key “QWERTY”-style membrane keypad is used to enter test information and operate the unit. Computer Interface The TRM-203/403 can be connected to a PC via the unit’s RS-232C, USB, or Bluetooth interface. A PC can be used to control the TRM-203/403 to perform transformer resistance tests. Test records (stored in the TRM-203/403 or a USB Flash drive) can also be retrieved, reviewed, and printed. Test records are automatically exported to PDF, Excel, and XML formats. Safety Features The TRM-203/403 automatically dissipates the energy stored in the transformer at the end of each test. The discharge circuit will continue to work even if the TRM-203/403 power supply is lost. Test Record Storage The TRM-203/403 can store up to 256 static test records (111 tests per record) and 120 dynamic test records internally. For external test record storage, the TRM-203/403 features a USB Flash drive interface port. Up to 999 test records can be stored on a connected USB Flash Drive.