The Vanguard TRM-403 can automatically demagnetize the inductive device under test, eliminating the manual task of demagnetizing the transformer core after a resistance test.
The meter also has a “make-before-break” test mode that can be used to test the Load Tap Changer (LTC) or Voltage Regulator contact test sequence.
The Vanguard TRM-403 produces a “Dynamic-Resistance” graph of the LTC or Voltage regulator contact under operation. An opened contact can be detected visually from this resistance chart.
The TRM’s built-in LTC/Voltage regulator can be used to conveniently change the LTC/voltage regulator tap position from the meter’s front panel.
The meter features a back-lit graphic LCD screen (128 x 64 pixels) that is clearly visible in both bright sunlight and low light levels.
The Vanguard TRM-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.
The meter automatically dissipates the energy stored in the transformer at the end of each test. The discharge circuit will continue to work even if the Vanguard TRM-403 power supply is lost.
Test Record Storage
The meter can store up to 256 static test records (111 tests per record) and 120 dynamic test records internally.