R&S SMB Test Procedures
1407.0806.82 1.9 E-5
Frequency
Frequency Setting
Test equipment
Test method The frequency setting is checked by running the internal synthesizer
adjustments to check the frequency overlap of the VCOs
Measurement Run: Setup Internal Adjustments Adjust Synthesis
There must be no error message.
Setting Time
Test assembly See section "Test Assembly for Setting Time", page 1.5. For
measuring after IEC/IEEE bus delimiter the EOI-line of the IEC/IEEE
bus is used as trigger signal instead of the pulse generator.
Test method The spectrum analyzer operates as an FM demodulator. A controller
transmits the start and the stop frequency via the IEC/IEEE bus. The
analyzer is triggered by the positive edge on the EOI line of the
IEC/IEEE bus or the trigger pulse in list mode. At switch over from start
to stop frequency, the settling procedure is displayed on the screen of
the analyzer.
Preparation of measurement
Synchronize the reference frequencies of the DUT and the
analyzer.
Make IEC/IEEE bus and RF connections.
Connect spectrum analyzers trigger connector to EOI line (pin 5) of
IEC/IEEE bus.
Settings on DUT:
- Frequency: start frequency unmodulated,
- Level: 0 dBm
Settings on spectrum analyzer:
- AMPT/REF LEVEL 0 dBm
- FREQ/CENTER/STOP FREQUENCY
- FM DEMOD ON
- DEMOD BW 50 kHz
- RANGE /DEVIATION PER DIV 200 Hz
- MEAS TIME 10 ms
- TRIGGER EXTERN
- External triggering by positive edge at 1.4 V.
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