TRANSFORMER TESTS VOLTECH AT3600 USER MANUAL
PAGE 7.1.40. VPN 98 - 024 TESTS AND TEST CONDITIONS
1.21. RLOS – RETURN LOSS
WHERE USED
The Return loss test measures the impedance mismatch between the transformer and
a transmission line of a specified impedance. RLOS is calculated from a measurement
of the complex impedance and the specified impedance. This test is suitable for audio
& telecommunication transformers and checks the effective input impedance of the
transformer in the application.
MEASUREMENT CONDITIONS
The load resistor is assumed to be on the fixture, but not shown on the Editor
schematic. It is switched in circuit using an OUT test that must be inserted in the
program before the RLOS test. (The relay patterns associated with inserting and
removing fixture resistors have deliberately not been included in the RLOS 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 resistor is permanently
fitted in circuit).
The test voltage is applied to the input winding, and the voltage and current
measured. From the measured results, and the reference impedance value (specified
by the user in the test dialogue), the return loss is calculated.
The impedances used are complex, where:
R
L
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