R&S FSP Troubleshooting
1164.4556.82 3.81 E-1
Selftest Design and Error Messages
Overview
The calibration source on the IF-filter module is used as signal source for testing the signal path.
1. Measurement of the operating voltages
a) of the power supply
b) regulated operating voltages on the detector and IF-filter modules
2. Temperature measurement on the IF-filter board
3. Testing the fourfold D/A converter on the detector
4. Test of the reference signals on the Standard Frontend (modules 1 and 2) and on the IF filter
modules
5. Synthesizer test on the frontend module
6. Testing of the signal paths on all boards
7. Test of optional modules
All measurements on the analog boards are independent of the gate arrays on the detector board, since
individual A/D converters are provided for them on the analog boards. The interface section in the FPGA
of the detector board must function properly to read these A/D converters. This is always tested with
switching on the instrument.
The signal path via the gate arrays on the detector board is tested using a known, analog signal at the
input of the A/D converter on the detector board. The analog test signal is provided by the preceding
analog tests.
Since the operating voltages are measured first, it is ensured that the selftest can be performed
correctly. If an operating voltage failed which is not required by the selftest this is correctly signalled in
the error list. If, however, all operating voltages are indicated to be faulty, it may well be assumed that
the operating voltage for the selftest has failed or the selftest A/D-converter itself is defective.
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