Voltech AT360, User Manual

Page: 317 / 470

V
OLTECH
AT
I
U
SER
M
ANUAL
P
AGE
7-19
7.1.5 LS, LP – I
NDUCTANCE
(S
ERIES AND
P
ARALLEL
E
QUIVALENT
C
IRCUIT
)
Range Test voltage Test frequency Basic accuracy
1nH  to 1MH 1mV to 5V 20Hz to 3MHz 0.05%
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).
AT Series
Tester
Ls
Rs
Rp Lp