The TRM-20 is Vanguard Instruments’ third generation transformer winding resistance meter. The TRM-20 is designed specifically to measure DC resistance values of transformer windings, rotating machine windings, or any dc resistance of an inductive device.
The TRM-20 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 60Vdc power supply. The TRM-20 is capable of outputting a selectable test current from 1A to 25A.
Since the TRM-20 can accurately measure resistance values from 1 micro-ohm to 2,000 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-20 can automatically demagnetize the inductive device under test, eliminating the manual task of demagnetizing the transformer core after a resistance test.
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Auto-discharge circuit for operator safety
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Demagnetizes transformer after test
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Selectable test current from 1A to 25A
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RS-232C, USB, and Bluetooth computer interfaces
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Built-in thermal printer
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TRM-20
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Cables
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TRM-20
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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: 33 lbs (15.4Kg)
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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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1-25A 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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RESISTANCE CHANNELS
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Two static resistance reading channels
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DISPLAY
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Back-lit LCD (64 x 128 dot graphic), 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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One 50-foot current cable set, two 50-foot resistance sense cable set,
One LTC control cable, One ground cable, one power cord,
One RS-232C cable, one USB cable
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OPTIONS
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Transportation 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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