3-48 Service Guide E8361-90001
Tests and Adjustments PNA Series Microwave Network Analyzers
Adjustments E8361A
8. Reconnect the power and USB cables. Turn on the analyzer.
9. On the System menu, point to Service, Adjustments, and then click LO Power Adjust.
10. Ensure the GPIB settings are correct.
11. Click Begin Adj, and then follow the instructions as they are displayed.
12. Turn off the analyzer, disconnect the power cable, reconnect the semi-rigid cables, and
replace the covers.
LO Offset Adjustment
The LO power adjustment is used to adjust the power level of the LO signals from the A20
LO distribution assembly. This adjustment is done for only one LO output. The differences
between each LO output is negligible; therefore, separate adjustments are not required.
Equipment used for the LO Power Adjustment
Procedure
1. Turn off the network analyzer and remove the power cable and other external cables
from the rear panel.
2. Remove the outer cover. Refer to “Removing the Covers” on page 7-6.
3. Connect a GPIB cable between the analyzer and the power meter.
4. Remove the semi-rigid cable connected to J3 LO OUT and the RECEIVER LO IN on
the A13 frequency offset receiver assembly.
5. Connect the right angle adapter to A13 LO OUT connector.
6. Connect the power sensor 8487A and the 11901D adapter or the E4413A power sensor
to the end of the right angle adapter as shown in Figure 3-20 on page 3-47.
Equipment Type
Model or
Part Number
Alternate Model
or Part Number
Power meter E4418B/E4419B E4418A/E4419A
Power sensor, 2.4 mm
8487A
E4413A
a
a. The E4413A 3.5 mm power sensor may be used instead of the 8487A power
sensor and 11901D adapter.
Adapter, 3.5 mm (m) to 2.4 mm (f) 11901D
Adapter, SMA (m) to SMA (f),
right angle
1250-1249 Equivalent
5/16-inch, open-end torque wrench
(set to 10 in-lbs)
N/A N/A
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