7.1.19 ILOS - Insertion Loss
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.
ILOS = 10 log (VI2 RL / 4 VO2 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.