Voltech AT5600, Руководство пользователя

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C H A P T E R 7 – T E S T S A N D T E S T C O N D I T I O N S
AT5600 User Manual 98-119 issue 14
Page 130
7.21. ILOS – Insertion Loss
Where Used
The Insertion loss test measures the output power delivered by a transformer to a
load, relative to the maximum power theoretically available. A voltage is applied to
the input winding and the input/output voltages are measured to calculate the
loss.
This test is suitable for audio & telecommunication transformers and checks the
effective losses in the transformer when used for its application.
Measurement Conditions
ILOS = 10 Log (Vi^2 * Rl / 4 Vo^2 * Rs)
The source and load resistors are assumed to be on the fixture but are not shown
on the Editor schematic. They are switched in circuit using an OUT test that must
be inserted in the program before the ILOS test. (the relay patterns associated
with inserting and removing fixture resistors have deliberately not been included in
the ILOS test dialogue for two reasons: a) it would make the dialogue too
complicated, and b) it is not always necessary - e.g. in the case of a fixture where
the resistors are permanently fitted in circuit).
The test voltage is applied to the input winding, and the voltages measured on the
input and output windings. From the ratio of input and output voltages, and the
resistance values (specified by the user in the test dialogue), the insertion loss is
calculated.
Please also see
14.6.17 for specific advice on programming the test, and
10.2.20 for test accuracy specification
Rs
Rl
Vo Vi