Technical data

Chapter 2 2-15
Performance Tests
4. External Source Mode Frequency Range
Figure 2-6 External Source Mode Frequency Range Test Setup
2. Preset the external source, and set the power level to 4 dBm, and the CW frequency to
10 MHz.
3. On the network analyzer, press
to set up the analyzer for an
external source input to the receiver channel R.
4. Press .
5. Press to observe the maximum value
of the receiver R input signal. The analyzer marker 1 reading should be ≤ −25 dBm. If
this is not the case, adjust the output power of the external source to achieve this
condition.
6. Check to see if the analyzer is phase-locking to the external CW signal.
• If the analyzer displays any phase lock error-messages, write “UNLOCK” in the
performance test record for the set CW signal.
• If the analyzer does not display any phase lock error-messages, write “LOCK” in the
performance test record for the set CW signal.
7. On the external source, set the CW frequency to 20 MHz.
8. On the network analyzer, press .
9. Repeat steps 7 and 8 for the CW frequencies listed on the performance test record.
In Case of Difficulty
1. Check the R sampler assembly by substituting it with the A sampler assembly.
2. Move the flexible RF cable (currently connected to the R sampler assembly) to the A
sampler assembly.
3. Use a 10 dB attenuator between the RF OUT and the analyzer receiver input A.
4. Repeat the test. In step 4, press .
5. If the test still fails, suspect the A11 phase lock board assembly.
Preset Sweep Setup
CW FREQ
10 M/µ
System
INSTRUMENT MODE EXT SOURCE AUTO
Meas
R
Marker Search
TRACKING ON SEARCH:MAX
Sweep Setup
CW FREQ
20 M/µ
Meas
A