Checking The Source Group - Keysight Technologies N5247B Service Manual

Troubleshooting
Measurement System Troubleshooting

Checking the Source Group

Source Group Tests
Before checking the source group assemblies, you must open the analyzer.
Use an antistatic work surface and wrist strap to reduce the chance of
electrostatic discharge for all of the procedures in this chapter.
1. Turn off the analyzer power.
2. Unplug the power to the analyzer and disconnect all front and rear panel
connections except installed jumpers.
3. Remove the outer and inner covers from the analyzer. Refer to
the Covers" on page
Procedures described in this document are performed with power
supplied to the product while protective covers are removed. Energy
available at many points may, if contacted, result in personal injury.
4. With the covers off, plug in the analyzer and turn on the power.
Do not operate the analyzer with the outer cover removed for more than
30 minutes, as this could cause the analyzer to overheat which could
result in costly damage.
IMPORTANT! In 2020, the PNA added direct digital synthesis (DDS)
capability to all serial number prefix ≥6021 instruments. The effect of
installing this DDS assembly is that the A4, A10, A11
integrated into a single A11
individual A4, A10, A11
prefix instruments ≥6021.
a. If your PNA has a serial prefix ≥6021
digital synthesizer (DDS) assembly. If your PNA has a serial prefix <6021, then A11 is a 13.5 GHz synthesizer board.
Frequency Banded vs. Broadband Failure
There are two main types of failures that are related to the source group.
Frequency banded failures are indicated by all receiver traces having partial
dropouts across the frequency range. Broadband failures are indicated by all
receiver traces being in the noise floor.
RF Signal Troubleshooting
Check the output power of the A, B, C, and D signals:
Equipment Used for This Check
Keysight N5247B Service Guide
7-6.
direct digital synthesizer assembly, and the
a
a , and A13 boards do not apply to serial number
or has been upgraded with a version 7 synthesizer assembly,
"Removing
a
, A13 boards are
then A15 is a direct
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