VOLTECH AT3600 USER MANUAL PROGRAMMING TESTS
TEST PROGRAM EDITOR VPN 98 - 024 PAGE 3.4.61.
4.37. ILK – LEAKAGE CURRENT TEST
A leakage current test is needed for transformers used in certain applications, mainly
medical, where it is an additional safety requirement.
The leakage current to be measured is that which flows between primary windings
and secondary windings under normal operating conditions due to interwinding
capacitance. In a switching power supply, the primary circuits could be connected
directly to the power line supply, and could experience the normal line voltage as a
common signal with respect to ground. This AC signal could cause a significant
leakage current to flow through the transformer to grounded secondaries.
This test is typically carried out by applying the test voltage between all the primary
terminals shorted together and all the secondary terminals and screen shorted
together.
On selecting "ILK Leakage Current" from the 'available tests' window, the following
dialog box is displayed:
To program the test:
1. Enter the value of voltage for the signal and the required frequency of the test.
Note also that the Measure button may be used here as outlined in section 3.9.
2. Select the integration time required. 'Medium' is the default setting. 'Long' will
give more stable readings (for tighter limits) at the expense of an increased test
time, and 'Short' will test at the maximum speed, but may give a slightly noisier
reading.
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