VOLTECH AT3600 USER MANUAL TRANSFORMER TESTS
TESTS AND TEST CONDITIONS VPN 98 - 024 PAGE 7.1.21.
The recommended test conditions depend on the inductance of the energised winding;
they are given in the table below assuming that the energised winding is the one with
the highest number of turns:
Inductance of the
Energised Winding
Preferred test signal
Frequency Voltage
100nH
1uH
10uH
100uH
1mH
10mH
100mH
1H
10H
100H
1KH
→
→
→
→
→
→
→
→
→
→
→
1uH
10uH
100uH
1mH
10mH
100mH
1H
10H
100H
1KH
10KH
300KHz
100KHz
30KHz
10KHz
1KHz
100Hz
100Hz
50Hz
50Hz
50Hz
20Hz
10mV
30mV
50mV
100mV
100mV
100mV
300mV
1V
5V
5V
5V
The Test Conditions for Turns Ratio Measurement
Notes: The signal is applied to the primary winding, or the winding which has the
largest number of turns.
However, if by doing this, the expected voltage on the winding with the
smallest number of turns falls below 1mV, then the test voltage should be
increased.
This may also require an increase in the test frequency so that the current
taken by the driven winding does not become too large, but in general this
frequency increase should be kept as small as possible to avoid problems
caused by stray capacitance at high frequencies.
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