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
Cable Part Number [8000-0005] USB Cable [ 6' (1.83m) ] 8000-0005 [8000-0009] H Single Phase Cable [ 15' (4.57m) ] 8000-0009 [8000-0010] H Extension Cable [ 25' (7.62m) ] 8000-0010 [8000-0011] X Single Phase Cable [ 15' (4.57m) ] 8000-0011 [8000-0012] X Extension Cable [ 25' (7.62m) ] 8000-0012 [8000-0013] H 3-Phase Cable [ 15' (4.57m) ] 8000-0013 [8000-0014] X 3-Phase Cable [ 15' (4.57m) ] 8000-0014 [8000-0015] LTC Control Cable [ 15' (4.57m) ] 8000-0015 [8000-0016] Power + Ground Combination Cable 8000-0016 [8000-0186] 3-Phase H Cable [ 30' (9.14m) ] 8000-0186 [8000-0187] 3-Phase X Cable [ 30' (9.14m) ] 8000-0187 [8000-0188] Single-Phase H Cable [ 30' (9.14m) ] 8000-0188 [8000-0189] Single-Phase X Cable [ 30' (9.14m) ] 8000-0189

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).