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Publication No. 980897 Rev. A
3156B User Manual
Name
Variable
Type
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.
hopDwellTime
ViReal64
Programs dwell time for the fixed dwell-time frequency
hop function. The same dwell time will be valid for each
frequency hop.
Description
NOTE: Dwell time is programmed in units of µs
(microsecond). For example, to program 1.37ms dwell
time, enter the value as follows: 1370
Valid range: 0.5 to 21e6 (µs)
Default: 0.5
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.
Ri3156b_set(query)_hop_marker
Description
Programs where on the frequency list the 3156B will generate a pulse, designated as Hop marker, or index
point. The marker pulse is generated at the SYNC output connector. It can also be place on one of the
backplane trigger lines using the ri3156B_ set_TTLTRG_n_output_state function call.
Channel Dependency: independent
C Syntax
ViStatus ri3156b_set_hop_marker (ViSession instrHandle, ViInt16 hopMarkerIndex)
ViStatus ri3156b_query_hop_marker (ViSession instrHandle, ViInt16 * hopMarkerIndex)
Parameters
Name
Variable
Type
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.
hopMarkerIndex
ViInt16
Selects the hop step index for the marker output.
Description
Valid range: 1 to 4096 (without exceeding the physical
Astronics Test Systems
Programming Reference 5-95