Instrument Function
R&S
®
SMU200A
435Operating Manual 1007.9845.32 ─ 15
Clock Source
Selects the clock source.
"Internal"
The internal clock reference is used to generate the symbol clock.
"External"
The external clock reference is fed in as the symbol clock or multiple
thereof via the CLOCK connector.
The polarity of the clock input can be changed with the aid of "Global
Trigger/Clock Settings".
In the case of two-path instruments this selection applies to path A.
SCPI command:
[:SOURce<hw>]:BB:MCCW:CLOCk:SOURce on page 686
Clock Mode
Enters the type of externally supplied clock.
"Sample"
A sample clock is supplied via the CLOCK connector.
"Multiple Sam-
ple"
A multiple of the sample clock is supplied via the CLOCK connector; the
sample clock is derived internally from this.
SCPI command:
[:SOURce<hw>]:BB:MCCW:CLOCk:MODE on page 685
Clock Multiplier
Enters the multiplication factor for clock type "Multiple".
SCPI command:
[:SOURce<hw>]:BB:MCCW:CLOCk:MULTiplier on page 686
Measured External Clock
Indicates the measured frequency of the external clock signal. This enables the user to
permanently monitor the frequency of the externally introduced clock.
This information is displayed only if the external clock source has been selected.
SCPI command:
:CLOC:INP:FREQ?
Global Settings
The buttons in this section lead to submenu for general trigger, clock and mapping set-
tings.
Global Trigger/Clock Settings
Calls the "Global Trigger/Clock/Input Settings" dialog.
This dialog is used among other things for setting the trigger threshold, the input impe-
dance and the polarity of the clock and trigger inputs.
In the case of two-path instruments, these settings are valid for both paths.
The parameters in this menu affect all digital modulations and standards, and are descri-
bed in chapter 5.2.3.10, "Global Trigger/Clock/External Input Settings", on page 137.
Baseband Signal - Baseband Block
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