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ISO 9001 and 17025 Certified



Transformer Turns Ratio Tester

9036-UC [ATRT-01B S3]

The ATRT-01B S3 is Vanguard’s fourth generation, micro-processor based, single phase, automatic transformer turns-ratio tester. The ATRT-01B S3 uses the IEEE C57.12.90 measuring method to determine the transformer turns-ratio. The transformer turns-ratio is determined by precisely measuring the voltages across the unloaded transformer windings. The ATRT-01B S3’s measuring circuitry self adjusts before each measurement to ensure turns-ratio accuracy. Two selectable test voltages, 4Vac and 40Vac, offer flexibility in testing different types of transformers. The ATRT-01B S3 is battery or AC-powered. The unit can be used continuously for up to 4 hours pwer charge and can be used during charging.

  • Standalone or computer-controlled
  • Inexpensive
  • Displays turns-ratio from 0.8-15,000
  • Calculates turns-ratio percentage error
  • Displays winding polarity and phase angle
  • Displays excitation current
  • Battery or AC-Powered





Technical Specifications

TYPE Transformer Turns Ratio Tester
PHYSICAL SPECIFICATIONS Dimensions: 12” x 10” x 8” (30.4 cm x 25.4 cm x 20.3 cm)
Weight: 9 lbs. (4.3 Kg)
INPUT POWER 90 to 240 Vac, 50/60 Hz
SLA battery delivering up to 4 hours of continuous operation per charge
RATIO MEASURING RANGE 0.8 - 15,000 (5 digit resolution)
TURNS-RATIO ACCURACY 40 Vac: 0.8-1,999 (0.1%), 2,000-3,999 (0.25%), 4,000-15,000 (1%)
4 Vac: 0.8-1,999 (0.1%), 2,000-3,999 (0.25%), 4,000-15,000 (2%)
TEST VOLTAGE 4 Vac @ 300mA, 40 Vac @ 70mA
PHASE ANGLE MEASUREMENT 0 - 360 degrees, Accuracy ±0.2 degree (±1 digit)
POLARITY READING In-Phase or Out-of-Phase indication
EXCITATION CURRENT READING RANGE 0-2 Amperes, Accuracy: 2% of reading (±1 mA)
DISPLAY Back-lit LCD (128 x 64 pixels), viewable in direct sunlight and low light levels
PC SOFTWARE  Windows XP/Vista/7 Transformer Analysis Software (included with purchase)
INTERNAL TEST RECORD STORAGE 128 records of 33 readings
EXTERNAL TEST RECORD STORAGE Up to 999 test records on external USB Flash drive.
SAFETY Designed to meet IEC 61010 (1995), UL 61010A-1, and CSA-C22.2 standards
ENVIRONMENT Operating: -10ºC to 50ºC (15ºF to +122ºF)
Storage: (-30ºC to 70ºC (-22ºF to +158ºF)
HUMIDITY (MAX) 90% RH @ 40˚ C (104˚ F) non-condensing
ALTITUDE (MAX) 2000m (6562 ft) to full safety specifications
CABLES One 15 ft. (4.6m) Single phase cable, one power cord, one cable bag
OPTIONS Transportation Case (Can hold unit and cables)
WARRANTY One year on parts and labor
Specifications are valid at nominal voltage and ambient temperature of +25˚C (+77˚F).