3156B User Manual
Programming Reference 5-104
Racal Instrument © 2005
Ri3156b_set(query)_FM_marker
Description
This function programs marker frequency position. FM marker can be placed inside the following range: (carrier
frequency ± deviation frequency / 2). The marker pulse is output from the SYNC output connector. It can also
be place on one of the TTLTrg0-7 lines using the ri3156B_set_TTLTRG_n_output_state () function.
Channel Dependency: Independent
C Syntax
ViStatus ri3156b_set_FM_marker (ViSession instrHandle, ViReal64 FMmarkerFrequency)
ViStatus ri3156b_query_FM_marker (ViSession instrHandle, ViReal64 * FMmarkerFrequency)
Parameters
Name
Variable
Type
Description
instrHandle
ViSession
The Instrument Handle is used to identify the unique
session or communication channel between the driver
and the instrument. If more than one instrument of the
model type is used, this will be used to differentiate
between them. Note that the initialize function may be
used to associate multiple instrument handles with a
single instrument.
FMmarkerFrequency
ViReal64
Programs the FM marker frequency parameter.
Valid range: Within (carrier frequency ± deviation
frequency / 2)
Default: Carrier frequency setting
Return Values
Displays the return status of the function call. If the function was successful, it will return a status of
VI_SUCCESS, otherwise it will return an error code. Passing the error code into the function
"ri3156B_error_message()" will return a string describing the error.