Ronde & Schwarz 1304.0004.03, Руководство пользователя

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The Spectrum Application (RF Measurements)
R&S
®
FPL1000
364 User Manual 1178.3370.02 ─ 09
Frequency resolution is further restricted by the RBW and sweep time settings.
To determine the frequency of a signal point accurately without changing the sweep
settings, the R&S
FPL1000 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
FPL1000 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 "Measuring the Signal Frequency Using the
Signal Counter" on page 101.
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 897
CALCulate<n>:MARKer<m>:COUNt
on page 885
CALCulate<n>:MARKer<m>:COUNt:RESolution
on page 886
Signal Count Marker State .......................................................................................... 364
Resolution ................................................................................................................... 364
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 885
CALCulate<n>:MARKer<m>:COUNt:FREQuency?
on page 885
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 886
Marker Usage