R&S CMU Manual Test Procedure
1100.4903.82 1.9 E-5
Reference Frequencies
For different range of adjustment of the internal reference oscillator, the synchronization with an external
reference frequency is checked.
Note: The resolution of the frequency counter/analyzer should be max. 1/10 of the maximum
permissible deviation.
REF IN
The frequency and level ranges and the pull-in range are checked. The signal generator and the
frequency counter must be synchronized (test setup REF1).
Preparation:
Feed in at REF IN: 52 MHz sinewave, 0.5 V(rms)
Connect frequency counter to RF3 OUT.
Control: Set R&S CMU to external reference 52 MHz, RF 1 GHz (menu RF ANALYZER/
GENERATOR.)
Test: Use frequency counter to measure frequency deviation from 1 GHz.
Preparation:
Feed in at REF IN: 1 MHz sinewave, 0.5 V(rms).
Connect frequency counter to RF3 OUT.
Control: Set R&S CMU to external reference 1 MHz, RF 1 GHz.
Test: Use frequency counter to measure frequency deviation from 1 GHz.
Preparation:
Feed in at REF IN: 10.000 050 MHz sinewave, 1.4 V(rms).
Connect frequency counter to RF3 OUT.
Control: Set R&S CMU to external reference 10 MHz, RF 1 GHz.
Test: Use frequency counter to measure frequency deviation from 1.000 005 000 GHz.
Preparation:
Feed in at REF IN: 9.999 950 MHz sinewave, 1.4 V(rms).
Connect frequency counter to RF3 OUT.
Control: Set R&S CMU to external reference 10 MHz, RF 1 GHz.
Test: Use frequency counter to measure frequency deviation from 0.999 995 GHz.
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