R&S PB Installation Instructions CMU-B11 OCXO REF.OSC. Bi/1CMK 22.02.99 1100.5080.00 01.00
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4 Functional Test of Option CMU-B11
½ Connect unit to AC supply and switch on.
Test of Option Detection
½ Press SETUP hardkey SYSTEM panel.
½ Press OPTIONS softkey located on the row of keys at bottom of display.
½ --> Check whether option CMU-B11 is indicated and activated.
Test of Frequency Accuracy
Preparation:
The measurement can be carried out at the connector REFOUT1 (rear of CMU) at 10 MHz or at the connector
RF3OUT (front panel) at
1GHz with a frequency counter.
½ Set the generator to 1 GHz and 13 dBm with no modulation for measurement at connector RF3OUT in
the RF menu.
For this setting, CMU must be switched to its internal reference source.
½ This is to be selected in the Sync. menu depending on the application.
Note: For fast setting, the measurement at 1 GHz can be made with reduced resolution (1 Hz).
Measurement:
(Carry out the following adjustment only if required)
½ Adjust reading on frequency counter to:
10.000 000 00 MHz –0.1/+0.05 Hz (at REFOUT1) or
1.000 000 000 GHz –10 Hz/+5 Hz (at RF3OUT) with the aid of potentiometer R5 on module OCXO
REFERENCE OSC. (a tolerance of -2 to -5 Hz is required due to ageing).
Note: The CMU must be on for at least 5 minutes for the OCXO to warm up.
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