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ISO 9001 Certified


Vanguard Instruments Company, Inc., Electronic Testing Equipment, Ontario, CA
       

TRF-250A

Automatic, 3-Phase Transformer Ratio Finder

 
       
9106-UC [TRF-250A]
9106-SC [TRF-250A shipping case]
The TRF-250A is the battery-powered version of the TRF-250. Its battery offers approximately 3 hours of continuous use. The TRF-250A features a built-in charger that allows the unit to be used while charging.
The TRF-250A provides a test voltage of 250Vac, a wireless Bluetooth PC interface, and features a 44-key “QWERTY”-style membrane keyboard. All these features greatly improve the accuracy of the turns ratio readings, ease of operation, and reliability.
The TRF-250A determines the turns ratio of the transformer under test using the IEEE C57.12.90 measurement method. The turns-ratio range is from 0.8 to 50,000 to 1. Transformer turns ratio,  excitation current, and winding polarity are displayed on the built-in 128 x 64 pixels graphic LCD screen. The TRF-250A can be used as a standalone unit or can be computer-controlled.
  • Battery-powered
  • Ratio range: 0.8 – 50,000 : 1
  • Capable of detecting 130 different 3-phase transformer types defined by ANSI, IEC, and Australian standards
  • 4 test voltages: 4Vac, 40Vac, and 100Vac, and 250 Vac
  • Phase angle and excitation current measurement
  • Bluetooth and USB PC interfaces
  • 4.5” wide thermal printer
       

TRF-250A

Cables

 
       
       

TRF-250A

Technical Specifications

 
       
TYPE Portable, lightweight, automatic 3-phase transformer turns-ratio meter
PHYSICAL SPECIFICATIONS 18”W x 5”H x 12”D (45.7 cm x 12.7 cm x 30.5 cm ); Weight: 20 lbs (9.1 kg)
INPUT POWER 100 – 240 Vac, 50/60 Hz
MEASURING METHOD ANSI/IEEE C57.12.90
TURNS-RATIO MEASURING RANGE 0.8 – 50,000 to 1
BATTERIES
two lead acid batteries (12V, 2AH) provide up to 3 hours of operation
LTC CONTACT 240 Vac, 2A
TYPICAL TURNS RATIO ACCURACY
4 Vac: 0.8 – 1,000 (±0.08%), 1,001 – 4,000 (±0.1%), 4,001 – 15,000 (±0.25%)
40 Vac: 0.8 – 1,000 (±0.05%), 1,001 – 4,000 (±0.1%), 4,001 – 15,000 (±0.25%), 15,001 – 20,000 (±0.4%) , 20,001 – 50,000 (±0.5%)
100 Vac: 0.8 – 1,000 (±0.05%), 1,001 – 4,000 (±0.1%), 4,001 – 15,000 (±0.25%) , 15,001 – 20,000 (±0.4%), 20,001 – 50,000 (±0.5%)
250 Vac: 0.8 – 1,000 (±0.03%), 1,001 – 4,000 (±0.1%), 4,001 – 15,000 (±0.2%) , 15,001 – 20,000 (±0.4%), 20,001 – 50,000 (±0.5%)
TEST VOLTAGES 4 Vac @ 120 mA, 40 Vac @ 50 mA, 100 Vac @ 20 mA, 250 Vac @ 10 mA
CURRENT READING RANGE 0 – 1 Ampere, accuracy: ±0.1mA, ±2% of reading (±1 mA)
DISPLAY
back-lit LCD screen (128 x 64 pixels); viewable in bright sunlight and low-light levels
PHASE ANGLE MEASUREMENT
0 – 360 degrees; accuracy: ±0.2 degree (±1 digit)
PRINTER built-in 4.5” wide thermal printer
COMPUTER INTERFACES Bluetooth, USB port
PC SOFTWARE Windows®-based transformer turns-ratio analysis software is included with purchase
INTERNAL TEST RECORD STORAGE stores 112 complete transformer test records, each record holding the test record header and up to 99 readings
INTERNAL TEST PLAN STORAGE stores up to 128 transformer test plans; plans can be transferred to PC.
EXTERNAL TEST RECORD STORAGE up to 999 test records on external USB flash drive (drive not included)
SAFETY designed to meet UL 61010A-1 and CAN/CSA C22.2 No. 1010.1-92 standards
HUMIDITY 90% RH @ 40°C (104°F) non-condensing
TEMPERATURE
Operating: -10°C to +50°C (+15°F to +122°F)
Storage: -30°C to +70°C (-22°F to +158°F)
ALTITUDE
2,000 m (6,562 ft) to full safety specifications
CABLES One 15-foot (4.57m) single-phase set, one 15-foot (4.57m) 3-phase set, one 25-foot (7.62m) extension set, one safety ground, one USB, cable bag
OPTIONS shipping case, 30' (9.14 m) 3-phase H and X leads, 30' (9.14 m) single phase H and X leads
WARRANTY one year on parts and labor
Specifications are valid at nominal voltage and ambient temperature of +25˚C (+77˚F).
Last updated on June 21, 2019