Racal Instruments 3156B, Руководство пользователя

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3156B User Manual
Racal Instrument © 2005 Programming Reference 5-97
Ri3156b_set(query)_sweep_direction
Description
This specifies if the 3156B output will sweep from start-to-stop (UP) or from stop-to-start (DOWN) frequencies.
Sweep time does not affect the sweep direction and frequency limits. At the end of the sweep cycle the output
waveform normally maintains the sweep stop frequency setting but will maintain the start frequency, if the
DOWN option is selected.
Channel Dependency: Independent
C Syntax
ViStatus ri3156b_set_sweep_direction (ViSession instrHandle, ViInt16 sweepDirection)
ViStatus ri3156b_query_sweep_direction (ViSession instrHandle, ViInt16 * sweepDirection)
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.
sweepDirection
ViInt16
Programs the sweep direction parameter.
Valid range: 0,1
0 – selects sweep UP
1 – selects sweep DOWN
Default: 0
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.