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Performing Tests
Insertion Loss Measurement
Chapter 4
O:\Manuals\E6385A_Cdma\Book\perf-tst.fm
80
Insertion Loss Measurement
This measurement determines the loss associated with RF cables, filters, and other
passive devices in the measurement path. This test uses the Test Set internal source and
measures the relative loss through the cable or device.
To optimize measurement accuracy, the measurement setup diagram indicates the use of
two external 6-dB attenuators (pads) and a short calibration cable. The pads are
optional, but should be used if available. These parts are not standard equipment with
the Test Set, but are included in the optional accessory kits (see “Accessory Kits” on page
17).
This test sends no control commands to the MSC.
Parameters and Specifications Used
The following specifications and parameters are used when running this test. See
Chapter 5, “Reference,” for descriptions of the specifications and parameters.
Parameters:
• None used for this test.
Specifications (Pass/Fail Limits):
• None used for this test.
Select and Run the Test
Perform the Insertion Loss Measurement as follows:
Step 1. From the Lucent CDMA Tests Main Menu screen, select the Calibration/Utilities
field. The Test Software will display the Calibration/Utilities Menu screen.
Step 2. Select the Insertion Loss Test field.
Step 3. If prompted to do so, remove the RF connections from the Test Set and press the
k1
(Proceed) key to perform a channel power calibration. If channel power was recently
calibrated, the Test Software might not prompt you to re-calibrate before starting the
Insertion Loss test.
Step 4. Select the Loss Measurement Type field and select the following:
• Swept will measure the loss over the frequency range that you specify in the Start
Frequency and Stop Frequency settings. The Maximum Expected Loss for the
device to be tested will be used to adjust the scale on the results plot. Use a value
slightly greater than expected for the best display resolution. The Duplex Out Level
into the device being tested may be adjusted if necessary.
• Discrete will measure the loss at the frequency that you specify by entering the
Channel Number to be tested.
Step 5. Press the
k1 (Proceed) key to start the measurement.
Step 6. Connect the short calibration cable as directed, and then press the
k1 (Proceed) key.