Technical data

Chapter 2 2-13

Performance Tests

3. Receiver Minimum R Channel Level

2. Press .

3. Press to locate the maximum value

of the R channel input signal.

4. Press .

5. Press .

6. Check the analyzer display for phase lock error messages:

• If you do not observe a phase lock error message, write the marker value readout

(which appears in the analyzer display) in the performance test record.

• If you do observe a phase lock error message:

a. Press to increase the power by 1 dBm.

b. Check the analyzer for phase lock error messages.

c. If the analyzer still doesn't phase lock, continue increasing the source output

power until phase lock is achieved.

d. Write the marker value in the performance test record.

• Repeat steps 5 and 6 for the other CW frequencies listed on the performance test

record.

In Case of Difficulty

1. Check the flexible RF cable between the R sampler assembly and the A11 phase lock

assembly. Make sure it is connected between A11J1 (PL IF IN) and 1st IF Out.

2. Use an ohmmeter to verify that the RF cable is not open. In addition, examine both the

cable connectors — measure the resistance between the cable center pin and the cable

connector. The ohmmeter should display a high resistance reading.

3. Check the R sampler by substituting it with the A sampler and rerun the test:

a. Move cable W8 to the A sampler.

b. Use a 10 dB attenuator between the RF OUT and input A.

c. Repeat the test.

d. Select the A sampler by pressing in step 2.

e. If the test fails, replace the A11 assembly.

4. Verify that the high/low band adjustments are still within specifications. For more

information on how to perform this task, refer to “High/Low Band Transition

Adjustment” on page 3-45.

5. Refer to Chapter 7 , “Source Troubleshooting,” for troubleshooting information.

Preset Meas

Marker Search

TRACKING ON SEARCH:MAX

Power −10 x1

Sweep Setup

CW FREQ

300 k/m

Power

Meas