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6-11
Performance Tests – Option 011
3. Receiver Minimum R Channel Level
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”.
through
for the other CW frequencies listed in the “Per-
formance Test Record”.
In Case of
Difficulty
W A R N I N G
These servicing instructions are for use by qualified personnel only.
To avoid electrical shock, do not perform any servicing unless you are
qualified to do so.
W A R N I N G
The opening of covers or removal of parts is likely to expose
dangerous voltages. Disconnect the instrument from all voltage
sources while it is being opened.
W A R N I N G
The power cord is connected to internal capacitors that may remain
live for five seconds after disconnecting the plug from its power
supply.
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
Using an ohmmeter, 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
MEAS
,
INPUT PORTS
,
A
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 the “High/Low Band
Transition Adjustment”, located in the “Adjustments and Correction
Constants” chapter in the
Agilent 8753D Option 011 Service Guide
.
Содержание 8702D
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