Keysight N5221A Service Manual page 109

2-port and 4-port pna microwave network analyzers (10 mhz - 13.5 ghz) (10 mhz - 26.5 ghz)
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PNA Series Microwave Network Analyzers
N5221A/22A
Equipment Setup
1. Before starting these checks, zero and calibrate the power meter. (See the power meter user's guide for
instructions on setting the calibration factor.)
2. If the Receiver Display (
Press UTILITY
System
3. Set the sweep speed for a 10 second sweep: Press STIMULUS
time to 10.000 seconds in the Sweep Time box.
To isolate a broadband RF signal generation failure, check the test port output power:
4. Note the power reading displayed on the power meter; it should be the preset power level +/- 1 dB.
5. Connect the power sensor, in turn, to Ports 2, 3, and 4 and set trace to measure S
respectively. Note the power reading displayed on the power meter.
• If the power level is low or high on all test ports, the problem is LO signal related. Continue with
"Checking the A10 50 MHz Reference
• If the power level is low or high on only one of the test ports, the problem is either source group or in the
signal separation group. Continue with
source group.
Checking the A10 50 MHz Reference Outputs
1. Refer to the block diagram at the end of this chapter and to
page
6-17. Locate flexible cables W65, W66, and W67, at the A10 frequency reference board.
2. Disconnect cables W65, W66, and W67, one at a time, from the A10 board.
3. Connect the spectrum analyzer to the open connector on the A10 board.
4. The spectrum analyzer should measure a signal at 50 MHz.
5. If any of the 50 MHz signals are not present, replace the A10 frequency reference board. Refer to
and Replacing the A4–A13 Boards" on page
6. If the 50 MHz signals are present, reconnect the cables, and then:
• for LO related problems, continue testing at
• for source related problems, continue testing at
Outputs" on page
Checking the A11 13.5 GHz LO Synthesizer Output
1. Refer to the block diagram at the end of this chapter and to
page
6-17. Locate the flexible cable W41 at the A11 LO synthesizer board.
2. Disconnect W41 from J1207.
3. Connect the spectrum analyzer to J1207.
4. Refer to
the IMPORTANT notice on page
and observe the spectrum analyzer measurement. For analyzers with DSP version 4.0, an 807.61 MHz
signal should be present. For analyzers with DSP version 5.0, an 807.44 MHz signal should be present.
Service Guide N5222-90001
or
) is not on the analyzer screen, perform the following:
Figure 4-7
Figure 4-8
Service
, then
, then
Outputs".
"Checking the A10 50 MHz Reference Outputs"
7-14.
4-33.
4-23. Set the network analyzer for an 800 MHz CW frequency
Measurement System Troubleshooting
Utilities
Receiver Display
, then
Sweep
"Top Cables, All Cables—All Options" on
"Checking the A11 13.5 GHz LO Synthesizer
"Checking the A4 and A13 Source Synthesizer
"Top Cables, All Cables—All Options" on
Troubleshooting
.
Sweep Time
, then
. Set the
, S
, and S
22
33
44
to check the
"Removing
Output".
4-31

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