Model ATRT-03 (v) Operating Instruction
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results directly to the PC. Since data is stored in ASCII format, the test results can be imported into
any database desired.
4.0 Principle of Operation
Before any tests are performed, the ATRT-03/03A/03B checks test-lead hook-ups for error. The
ATRT-03/03A/03B applies a low-level test voltage (300 mV) across the winding being tested and
senses the induced secondary voltages. When an induced voltage is greater than the applied
excitation voltage the test unit detects a hookup error. For safety reasons, testing is always done in
a step-down transfer manner. If a connection error is detected, the ATRT-03/03A/03B aborts the
test and displays, “Hook-Up Error.” If no hookup error is detected, the ATRT-03/03A/03B applies
a full test voltage to the transformer being tested and the winding (voltage) ratio is displayed.
The ATRT-03/03A/03B measures turns-ratios ranging from 0.8 to 15,000. Excitation current (via
H leads) is measured for reference and ranges from 0.0 to 2,000 mA. Winding polarity is displayed
as +/- signs and measured in degrees with ±0.2 degree resolution. Phase angle measurement is
printed in detail format only (see 14-11). The ATRT-03/03A/03B calibrates its own sensing circuits
before each test. Therefore, adjustment by the operator is not required.
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