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T
ESTS AND
T
EST
C
ONDITIONS
P
AGE
7-46 V
OLTECH
AT
I
U
SER
M
ANUAL
Test Conditions
Leakage inductance is tested by measuring the inductance of a primary
winding when one or more secondary windings are shorted out. (See also the
LS test). Typically, the impedance to be measured is very small, so a constant
current AC test signal is used to provide stable, accurate results over a broad
range of values.
The tester applies the short circuit automatically, without using any external
switches or components.
By measuring and analysing the small voltage present across the short circuit,
the tester compensates for the impedance of the wiring and other connections
in the shorted path. The error due to the small short-circuit impedance can
often be ignored. (This is the term A
SC
quoted in the accuracy specifications.)
When measuring on certain components, and particularly where the leakage
inductance is below 1
µ
H, it may not be possible for the AT to properly
compensate for all parasitic effects. To confirm the accuracy of the LL test
during program development, manually apply a good short circuit to the
transformer and run a normal LS test. The best short-circuit will be a length of
tinned copper wired (as short as possible) securely soldered directly across the
secondary connections. If the result of this LS test is significantly different to
the LL test (without the manual sort circuit but under the same test conditions)
then use an LLO (leakage inductance with offset) test with an appropriate
offset for production testing.
For example:
LL
= 550 nH
LS
= 500 nH (perfect short-circuit, same conditions)
Use an LLO test with -50nH offset.
Choosing the Test Signal
Choose a suitable test current and frequency based on the expected value of
the leakage inductance using the following table:
Содержание AT360
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Страница 249: ...VOLTECH ATI USER MANUAL PAGE 6 1 6 FRONT PANEL MODES...
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Страница 461: ...VOLTECH ATI USER MANUAL PAGE 9 1 9 WARRANTY AND SERVICE...
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