3-36 Service Guide N5230-90014
Tests and Adjustments PNA Series Microwave Network Analyzers
Adjustments N5230A
LO Power Adjustment
The LO power adjustment is used to adjust the power level of the LO signal from the
A6 multiplier board to the A20 mixer brick.
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. Place the analyzer on its side to allow access to the bottom of the analyzer.
4. Connect a GPIB cable between the analyzer and the power meter.
5. With a 5/16 inch open-end wrench, disconnect cable W3 at the A20 mixer brick. Refer to
“Bottom Cables, Passive Configuration (Options F06 and F13)” on page 6-16 to
determine the location of cable W3.
6. Connect the power sensor to the end of cable W3.
7. Reconnect the power and USB cables. Turn on the analyzer.
8. On the System menu, point to Service, Adjustments, and then click LO Power Adjust.
9. Ensure the GPIB settings are correct.
10. Click Begin Adj, and then follow the instructions as they are displayed.
11. Turn off the analyzer, disconnect the power cable, reconnect the semi-rigid cable W3,
and replace the cover.
Equipment Type
Model or
Part Number
Alternate Model
or Part Number
Power meter E4418B/E4419B E4418A/E4419A
Power sensor, 3.5 mm E4413A 8485A
5/16-inch, open-end torque wrench (set to 10 in-lbs) N/A N/A
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