• 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 (ATRT-01B S3 only)

The ATRT-01 S3 is Vanguard’s fourth generation, micro-processor based, single phase, automatic transformer turns-ratio tester. The ATRT-01 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-01 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 ATR-01 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 ATRT-01

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 ATRT-01 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 ATRT-01 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, phaseangle, and percentage error)

are displayed on the LCD screen.

User Interface

The ATRT-01 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 ATRT-01 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 ATRT-01 S3 via the

RS-232C port. Using the Transformer Analysis

software, the user can retrieve test records

(from the ATRT-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 ATRT-01B S3 is powered by a 6-volt, 7

ampere-hour, lead acid battery. This high capacity

battery, coupled with the ATRT-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.

Part number ATRT-01 S3 ATRT-01 S3 turns ratio tester, cables, and PC software

Part number ATRT-01B S3 ATRT-01B S3 turns ratio tester, cables, and PC software

Part number ATRT-01 S3-CABLE ATRT-01/01B S3 cables

Part number ATRT-01 S3-CASE ATRT-01/01B S3 shipping case