Transformer Turns Ratio Testers TTRT 01B S3

Transformer Turns Ratio Testers TTRT 01B S3

The TTRT-01B S3 is Amperis’ fourth generation, micro-processor based, single phase, and automatic transformer turns-ratio tester with rechargeable-battery powered. The TTRT-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 TTRT-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 TTRT-01B S3 can measure transformer turns-ratios ranging from 0.8 to 15,000 and can be used to test voltage regulators, power transformers, current transformers (CT), and potential transformers (PT). The TTRT-01B S3 also measures and displays transformer- winding excitation current, winding polarity, and winding phase angle. Test results are displayed on a back-lit LCD screen (128 x 64 pixels) that is viewable in bright sunlight and low-light conditions.

In addition to measuring a transformer’s turns-ratio, the transformer’s name plate voltages can also be entered, and the TTRT-01B S3 will then display the turns-ratio percentage error. This convenient feature eliminates any user calculation errors when testing transformers. When testing a 3-phase transformer, the TTRT-01B S3 provides connection information (H and X test leads to the transformer bushings) for phase A, B and C tests.

The three phase test results (turns-ratio, excitation current, winding polarity, phase angle, and percentage error) are displayed on the LCD screen.

User Interface

The TTRT-01B S3 features a back-lit LCD screen (128 x 64 pixels) that is viewable in direct sunlight and low-light levels. A rugged 16-key membrane keypad is used to enter test information and to operate the unit.

Test Record Storage

The TTRT-01B S3 can store 128 records of 33 readings internally, and up to 999 test records on an external USB Flash drive. Test records can be recalled using the included Transformer Analysis PC software.

Computer Interface

A Windows®-based Transformer Analysis application is provided with each unit and can be used to remotely control the TTRT-01 S3 via the RS-232C port. Using the Transformer Analysis software, the user can retrieve test records (from the TTRT-01 S3’s memory or a USB Flash drive), analyze test results, and print test results on a desktop printer. Test results are automatically exported to Excel, PDF and XML formats.

Battery Power for Exceptional Portability

The TTRT-01B S3 is powered by a 6-volt, 7 ampere-hour, lead acid battery. This high capacity battery, coupled with the TTRT-01B S3’s low power consuming circuitry, allows the unit to be used continuously for up to 4 hours per charge. A built-in charger allows the unit to be used during charging.

TTRT-01B S3’s Specifications


Transformer turns ratio tester

Physical specifications

Dimensions: 12”W x 10”H x 8” D (30.4 cm x 25.4 cm x 20.3 cm); weight: 9 lbs. (4.3 Kg)

Input power

90 - 240 Vac, 50/60 Hz


SLA battery delivering up to 4 hours of continuous operation per charge

Measuring method

ANSI/IEEE C57.12.90

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 voltages

4 Vac @ 500mA, 40 Vac @ 70mA

Phase angle measurement

0 - 360 degrees, Accuracy ±0.2 degree (±1 digit)

Polarity reading

In-Phase or Out of Phase indication

Current reading range

0 - 2 Amperes, Accuracy: 2% of reading (±1 mA)


Back-lit LCD (128 x 64 pixels), viewable in direct sunlight and low light levels

Computer interface


Pc software

Windows®-based 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


Designed to meet IEC 61010 (1995), UL 61010A-1, and CSA-C22.2 standards


Operating: -10°C to +50°C (+15°F to +122°F); Storage: -30°C to +70°C (-22°F to +158°F)


90% RH @ 40°C (104°F) non-condensing


2,000 m (6,562 ft) to full safety specifications


One 15 ft (4.6m) single phase cable, one power cord, one cable bag


Transportation case (can hold unit and cables)


1 year on parts and labor

Test result Transformer Turns Ratio Testers TTRT 01B S3

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