R&S FSW Series, Руководство пользователя

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Common Analysis and Display Functions
R&S
®
FSW
533 User Manual 1173.9411.02 ─ 43
To determine the frequency of a signal point accurately without changing the sweep
settings, the R&S
FSW is equipped with a signal counter. The signal counter sets the
RF to the current marker position, then counts the zero crossings of the IF (thus the
term signal
counter ) and derives the precise frequency value.
Signal counting can be performed explicitly at the current marker position ("Signal
Count" marker function), or implicitly by the R&S
FSW for certain functions.
Signal counting is only possible while the instrument is not sweeping. Thus, to perform
a signal count for a marker, the sweep is stopped at the marker position. The fre-
quency is determined with the desired resolution and then the sweep is allowed to con-
tinue.
A measurement example is described in Chapter 7.1.3.2, "Measuring the Signal Fre-
quency Using the Signal Counter" , on page 137.
Signal counters are not available for measurements on I/Q-based data.
Remote commands:
"Example: Performing a Highly Accurate Frequency Measurement Using the Signal
Count Marker"
on page 1208
CALCulate<n>:MARKer<m>:COUNt
on page 1196
CALCulate<n>:MARKer<m>:COUNt:RESolution
on page 1197
Signal Count Marker State .......................................................................................... 533
Resolution ................................................................................................................... 533
Signal Count Marker State
Activates or deactivates the special signal count marker function.
When activated, the sweep stops at the reference marker until the signal counter has
delivered a result.
Remote command:
CALCulate<n>:MARKer<m>:COUNt
on page 1196
CALCulate<n>:MARKer<m>:COUNt:FREQuency?
on page 1196
Resolution
Defines the resolution with which the signal is analyzed around the reference marker 1.
Remote command:
CALCulate<n>:MARKer<m>:COUNt:RESolution
on page 1197
Marker Usage