Manual Adjustment R&S CMU
1100.4903.82 2.3 E-5
Adjusting the 10 MHz Reference Frequency
Preparation:
Note:
The measurement can be performed either at connector REF OUT1
(rear of R&S CMU ) at 10 MHz or at connector RF3 OUT (front) at 1
GHz using a frequency counter.
For the measurement at connector RF3 OUT set the generator to
1 GHz and 13 dBm without modulation in the RF menu.
For the adjustment, the R&S CMU must be set to internal
reference source.
This setting is to be selected in the Connection Control – Sync.
menu of the respective application.
The measurement at 1 GHz can be performed with a lower frequency
counter resolution (1 Hz) in order to achieve a faster adjustment.
TCXO
Adjustment:
Note:
Use potentiometer R121 on the REFERENCE BOARD to adjust
the measured value at the frequency counter to
10.000 000 0 MHz ± 0.5 Hz (at REF OUT1) or
1.000 000 000 GHz ± 50 Hz (at RF3 OUT).
This adjustment is only required if none of the options R&S CMU -
B11 or B12 is installed.
OCXO REFERENCE OSC. R&S CMU -B11
(if option is installed)
Adjustment:
Note:
Use potentiometer R5 on the OCXO REFERENCE OSC.
BOARD to adjust the measured value at the frequency counter to
10.000 000 00 MHz –0.1/ +0.05 Hz (at REF OUT1) or
1.000 000 000 GHz –10 Hz/ +5 Hz (at RF3 OUT)
(a lead of at least –2 to –5 Hz at 1 GHz is desired because of
aging).
The R&S CMU must have been switched on for at least 5 minutes so
that the OCXO has warmed up.
OCXO REFERENCE OSC. R&S CMU -B12
(if the option is installed)
Adjustment:
Notes:
Use potentiometer R5 on the OCXO REFERENCE OSC.
BOARD to adjust the measured value at the frequency counter to
10.000 000 00 MHz –0.1/ +0.05 Hz or (at REFOUT1) or
1.000 000 000 GHz –10 Hz/ +5 Hz (at RF3OUT)
(a lead of at least –2 to –5 Hz at 1 GHz is desired because of
aging).
The R&S CMU must have been switched on for at least 10 minutes
so that the OCXO has warmed up.
During the adjustment, operate the R&S CMU in the horizontal
position!
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