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TRM-403
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Transformer Resistance Meter
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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.
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Perform three phase test on a transformer without the need to switch cables
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Can provide individual Delta winding resistance values
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Can provide individual Wye (with no neutral) winding resistance values
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Demagnetize transformer after test
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Selectable test current from 1A to 40A
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Computer control via RS-232C, USB, or Bluetooth interface
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Built-in 2.5" wide thermal printer
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TRM-403
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Cables
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TRM-403
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Technical Specifications
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TYPE
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Portable transformer winding resistance meter
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PHYSICAL SPECIFICATIONS
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21” W x 17” H x 9” D (53 cm x 43 cm x 24 cm); Weight: 35 lbs (15.8Kg)
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OPERATING VOLTAGE
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100 – 240 Vac, 50/60 Hz
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RESISTANCE READING RANGE
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1 micro-ohm to 500 Ohms
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ACCURACY
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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
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TEST CURRENT
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1-40A in 1A increments
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TEST VOLTAGE
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60 Vdc charging, 18V DC max during measurement
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INPUT CHANNELS
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4 input channels for measuring resistance
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DISPLAY
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Back-lit LCD (128 x 64 pixels), viewable in direct sunlight and low light levels
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PRINTER
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Built-in 2.5" wide thermal printer
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INTERNAL DATA STORAGE
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256 static test records (each can contain up to 111 readings) and 120 dynamic test records
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EXTERNAL DATA STORAGE
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Up to 999 test records on external USB Flash drive.
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COMPUTER INTERFACES
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RS-232C, USB, Bluetooth
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SAFETY
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Designed to meet UL 61010A-1 and Can/CSA C22.2 No 1010.1092 standards
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ENVIRONMENT
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Operating: -10oC to 50oC (15oF to +122oF)
Storage: (-30oC to 70oC (-22oF to +158oF)
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HUMIDITY (MAX)
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90% RH @ 40? C (104? F) non-condensing
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ALTITUDE (MAX)
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2000m (6562 ft) to full safety specifications
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CABLES
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Four 50-foot test cables, one LTC control cable, one ground cable, one power cord, one USB cable
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OPTIONS
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Shipping Case
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WARRANTY
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One year on parts and labor
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Specifications are valid at nominal voltage and ambient temperature of +25?C (+77?F).
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