Basic Instrument Functions
R&S
®
CMW500
107User Manual 1173.9463.02 ─ 02
As an alternative to the selection filter, use the "Enable/Disable All" or "Enable/Disable
Subtree" hotkeys.
Enable/Disable All, Enable/Disable Subtree
Selects all or a current group (subtree) of selftests for execution or clears the current
selection.
5.3.6 Sync Settings
The R&S CMW500 can be synchronized either to its fixed internal reference frequency
or to an external reference.
For multi-CMW setups a system synchronization signal has to be provided by one instru-
ment to the other instruments of the setup.
Fig. 5-14: Reference frequency settings
Frequency Source
Sets the R&S CMW500 to internal or external reference.
"Internal"
The internal 800 MHz reference frequency is generated using a Tem-
perature Controlled Crystal Oscillator (TCXO) or an optional oven
quartz (Timebase OCXO, option R&S CMW-B690A).
A 10 MHz reference signal which is derived from the internal reference
can be tapped at the output connector REF OUT 1 in order to syn-
chronize other devices. The R&S CMW500 then acts as a master, pro-
viding the reference clock for other devices.
"External"
With external synchronization, the internal reference frequency is not
used. Instead, the R&S CMW500 is synchronized to an external refer-
ence signal with variable frequency. The external reference signal is
also routed to the output connector REF OUT 1 in order to synchronize
other devices. The external reference signal must meet the specifica-
tions of the data sheet.
SCPI command:
SYSTem:BASE:REFerence:FREQuency:SOURce
Setup Dialog
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