Keysight N5227A Service Manual page 101

PNA Series Microwave Network Analyzers
N5227A
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 A14 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 A14 50 MHz Reference Outputs.
1. Refer to the block diagram at the end of this chapter and to
page 6-18. Locate flexible cables W75, W76, and W77, at the A14 frequency reference board.
2. Disconnect cables W75, W76, and W77, one at a time, from the A14 board.
3. Connect the spectrum analyzer to the open connector on the A14 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 A14 frequency reference board. Refer to
and Replacing the A4–A17 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 A15 13.5 GHz LO Synthesizer Output
1. Refer to the block diagram at the end of this chapter and to
page 6-18. Locate the flexible cable W51 at the A15 LO synthesizer board.
2. Disconnect W51 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 N5227-90001
or ) is not on the analyzer screen, perform the following:
Figure 4-7 Figure 4-8
Service
, then , then
Outputs".
"Checking the A14 50 MHz Reference Outputs"
7-10.
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 A15 13.5 GHz LO Synthesizer
"Checking the A4 and A17 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