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The TRM-403 is a  three phase transformer winding resistance meter 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. The TRM-403 can provide a fast and stable reading of very large transformers by utilizing a 60Vdc power supply. It is capable of outputting a selectable test current from 1A to 40A. Since the TRM-403 can accurately measure resistance from 1 micro-ohm to 500 Ohms, it can be used as a micro-ohm meter to measure EHV circuit breaker contact resistance, or for any low resistance measuring application.

• Perform three phase test on a transformer without the need to switch cables
• Can provide individual Delta winding resistance values
• Can provide individual Wye (with no neutral) winding resistance values
• Demagnetize transformer after test
• Selectable test current from 1A to 40A
• Computer control via RS-232C, USB, or Bluetooth interface
• Built-in 2.5" wide thermal printer

TRM-403	Cables
Cable Part Number [8000-0005] USB Cable [ 6' (1.83m) ] 8000-0005 [8000-0006] RS-232C Cable [ 6' (1.83m) ] 8000-0006 [8000-0015] LTC Control Cable [ 15' (4.57m) ] 8000-0015 [8000-0016] Power + Ground Combination Cable 8000-0016 [8000-0077] H/X - 0 Cable [ 50' (15.24m) ] 8000-0077 [8000-0149] H/X - 1 Cable [ 50' (15.24m) ] 8000-0149 [8000-0150] H/X - 2 Cable [ 50' (15.24m) ] 8000-0150 [8000-0151] H/X - 3 Cable [ 50' (15.24m) ] 8000-0151

TRM-403	Technical Specifications
TYPE Portable transformer winding resistance meter PHYSICAL SPECIFICATIONS 21” W x 17” H x 9” D (53 cm x 43 cm x 24 cm); Weight: 35 lbs (15.8Kg) OPERATING VOLTAGE 100 – 240 Vac, 50/60 Hz RESISTANCE READING RANGE 1 micro-ohm to 500 Ohms ACCURACY 1 – 19,999 micro-ohms: ±0.5% reading, ±1 count 20 – 999 milliohms: ±1% reading, ±1 count 1 -2000 Ohms: ±1.5% reading, ±1 count TEST CURRENT 1-40A in 1A increments TEST VOLTAGE 60 Vdc charging, 18V DC max during measurement INPUT CHANNELS 4 input channels for measuring resistance DISPLAY Back-lit LCD (128 x 64 pixels), viewable in direct sunlight and low light levels PRINTER Built-in 2.5" wide thermal printer INTERNAL DATA STORAGE 256 static test records (each can contain up to 111 readings) and 120 dynamic test records EXTERNAL DATA STORAGE Up to 999 test records on external USB Flash drive. COMPUTER INTERFACES RS-232C, USB, Bluetooth SAFETY Designed to meet UL 61010A-1 and Can/CSA C22.2 No 1010.1092 standards ENVIRONMENT Operating: -10?C to 50?C (15?F to +122?F) Storage: (-30?C to 70?C (-22?F to +158?F) HUMIDITY (MAX) 90% RH @ 40? C (104? F) non-condensing ALTITUDE (MAX) 2000m (6562 ft) to full safety specifications CABLES Four 50-foot test cables, one LTC control cable, one ground cable, one power cord, one USB cable OPTIONS Shipping Case WARRANTY One year on parts and labor Specifications are valid at nominal voltage and ambient temperature of +25?C (+77?F).