APC H15 Service Manual download pdf (Page 64)

6-8 User’s and Service Guide

Servicing the Test Set

Performance Testing

Testing for Return Loss

This test will check both the internal termination load of each port, as

well as the through match when the appropriate input port is

terminated with a 50

Ω load.

Set up the network analyzer using the following procedure.

Step 1. Set the number of points to 401 by pressing:

[MENU] > NUMBER OF POINTS > [401]

Step 2. Set the IF Bandwidth to 10 Hz by pressing:

[AVG] > IF BW > [10] > [x1]

Step 3. Perform a one-port S

calibration at the end of the test port cable

connected to Port 1 of the analyzer.

Step 4. Make sure the calibration is active.

Step 5. Save the calibration into the internal memory of the network analyzer

by pressing:

[SAVE/RECALL] > SAVE STATE

Step 6. Verify the calibration is active and accurate using a short connected to

the test port cable.

Step 7. Locate the maximum and minimum values of the data trace by

pressing:

[MARKER]

and using the front panel knob. The displayed return loss should

measure ± 0.2 dB.

Step 8. Connect the cable (already connected to Port 1 of the analyzer) to Port 1

of the test set.

Step 9. Connect a high-quality 50

Ω load to the Transmission port of the test

set.

Step 10. Select the “all_term” command using the network analyzer by pressing:

[SEQ] > TTL I/O > PARALLEL ALL OUT > [34] > [x1]

This command will ensure that no conflicts will occur when selecting

the test set ports.

Step 11. Select "Transmission Port 1", on the network analyzer by pressing:

[SEQ] > TTL I/O > PARALLEL ALL OUT

Enter the decimal value (D in Table 5-1 on page 5-6) to select the port,

then press:

[x1]

Check the status LCD to verify the port selected.

Step 12. On the network analyzer, press:

[MENU] > TRIGGER MENU

Wait until the analyzer is finished taking a sweep, then press:

[SCALE REF] > AUTO SCALE > [MARKER]

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APC H15 Service Manual Page 64

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