Performing Tests
Return Loss Measurement
Chapter 4
93
Performing Tests
Return Loss Measurement
This utility measures the return loss of a cable, antenna, or other device in the swept
mode. An SWR bridge and a 6-dB pad are connected to the Test Set. The Test Software
uses the pad to improve the mismatch between the SWR bridge and the ANT IN port on
the Test Set. It measures a reference level with an open or short on the bridge, measures
the return loss with the cable or antenna-under-test, and displays the results. This
utility sends no control commands to the MSC.
This measurement requires the use of two external 6-dB attenuators (pads), two type-N
cables, and an SWR bridge. These parts are not standard equipment with the Test Set,
but are included in the optional accessory kit (see “Optional Accessory Kits” on page 17).
Parameters and Specifications Used
The following parameters and specifications are used when running this test. See
Chapter 5, “Reference,” on page 95 for descriptions of the parameters and specifications.
Parameters:
• None used for this test.
Specifications (Pass/Fail Limits):
• None used for this test.
Select and Run the Test
Select and run the Return Loss Measurement as follows:
Step 1. From the Lucent AMPS Test Main Menu screen, select the Calibration/Utilities
field. The Test Software will display the Calibration/Utilities Menu screen.
Step 2. Scroll to Return Loss Measurement and press the knob.
Step 3. If the Test Software determines that channel power must be calibrated before testing, it
will prompt you to disconnect all cables from the Test Set. Disconnect any cables, and
press
k1 (Proceed).
