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TESTS AND TEST CONDITIONS
7.1.5 LS, LP – Inductance (Series and Parallel Equivalent Circuit)
Range
Test Voltage
Test Frequency
Basic Accuracy
1nH to 1MH
1mV to 5V
20Hz to 3MHz
0.05%
Ls
AT Series
Tester
Rp
Lp
Rs
Inductance is the electrical parameter that is commonly used to check
that a high-frequency transformer has been constructed according to its
design and that it will operate properly in use.
The inductance of a winding is determined by the number of turns and the
construction and dimensions of the core materials; it may also vary with test
conditions such as voltage and frequency.
The series and parallel inductance tests are used when testing signal, pulse,
switched mode and similar transformers with ferrite type cores, where the
inductance remains the same from small signals up to the operating
conditions.
Faults in numbers of turns, core material and core gapping may be determined
using this test.
For line frequency iron cored transformers where the inductance varies rapidly
with voltage a magnetizing current test (MAGI) is recommended. (The MAGI
test is only available on the Voltech AT3600).
VOLTECH ATI USER MANUAL
PAGE 7-19