3.4.19 RLOS - Return Loss
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.
On selecting "RLOS Return Loss" from the available tests window, the following dialogue box is displayed:
To program the test:
- Enter the voltage and frequency parameters of the test signal.
(If in doubt, refer to Chapter 7 - ‘Test Conditions’, which lists recommended test conditions.)
Note also that the Measure button may be used here as outlined in section 3.9.
- Select the integration time you require.
'Medium' is the default setting. 'Long' will give more stable readings (for tighter limits) at the expense of an increased test time, and 'Short' will test at the maximum speed, but may give a slightly noisier reading.
- Enter the names of the Hi and Lo input terminals and value of source resistance.
- Set the return loss limits.
| +/- |
Enter a nominal value and then the limits as negative and positive
values. |
| >< |
Enter minimum and maximum values. |
| > |
Enter just a minimum value. |
- Select OK. The test specification will then be displayed in the program window.