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TRF-250 USER'S MANUAL
3.2
Setting the Test Voltage
The TRF-250 offers four test voltages, 4 Vac, 40 Vac, 100 Vac, and 250Vac. The unit always
defaults to 40 Vac at power-on. The 4 Vac test voltage is for testing transformers which require
low test voltages, such as metering Current Transformers (CT's). For metering CT's, higher
voltages may drive the CT's into saturation, thus giving invalid results. The 40 Vac test voltage is
recommended for testing power transformers. The 100 Vac test voltage is recommended for
testing power transformers in noisy environments. The 250V test voltage provided by the TRF-
250 provides more accurate test results when measuring the transformer turns ratios of very
large transformers with a built-in LTC. Follow the steps below to set the test voltage:
a. Turn on the unit and start from the " START-UP" menu:
1. RUN TEST
2. SETUP
3. TEST PLANS
4. DIAGNOSTIC
TIME:
11:23:01
DATE:
08/29/14
[2]
Press the
key (SETUP).
b. The following screen will be displayed:
1. RECORD ID
2. TEST VOLTAGE
3. PRINT RECORD
4. SAVE/RESTORE RECORD
5. NEXT PAGE
[2]
Press the
key (TEST VOLTAGE).
c. The following screen will be displayed:
1. 4 Volts
2. 40 volts
3. 100 volts
4. 250 VOLTS
Select the desired test voltage by pressing the corresponding key on the numeric keypad
[1]
(
for 4 volts,
18
[2]
[3]
for 40 volts,
for 100 volts
,
[4]
or
for 250 volts).
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