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hpe1437_frequency_setup
hpe1437_frequency_setup sets all the zoom center frequency parameters. This
description also includes information on the following functions which set or query
frequency parameters individually:
hpe1437_frequency_cmplxdc selects a complex baseband measurement
hpe1437_frequency_cmplxdc_get gets the state of the baseband measurement mode
hpe1437_frequency_sync prepares the module for a synchronous frequency change
hpe1437_frequency_sync_get gets the state of the synchronous change mode
hpe1437_frequency_center sets the center frequency
hpe1437_frequency_center_get gets the current center frequency
VXIplug&play Syntax
#include "hpe1437.h"
ViStatus hpe1437_frequency_setup(ViSession id, ViInt16 cmplxDc, ViInt16 sync,
ViReal64 freq);
ViStatus hpe1437_frequency_cmplxdc(ViSession id, ViInt16 cmplxDc);
ViStatus hpe1437_frequency_cmplxdc_get(ViSession id, ViPInt16 cmplxDcPtr);
ViStatus hpe1437_frequency_sync(ViSession id, ViInt16 sync);
ViStatus hpe1437_frequency_sync_get(ViSession id, ViPInt16 syncPtr);
ViStatus hpe1437_frequency_center(ViSession id, ViReal64 freq);
ViStatus hpe1437_frequency_center_get(ViSession id, ViPReal64 freqPtr);
Description
hpe1437_frequency_setup sets the center frequency of a zoomed measurement. The
center of a frequency band of interest is converted to DC with this function. The
frequency transition is phase continuous unless the center frequency is set to zero in
which case the transition may be selected either to be phase continuous or phase reset.
This function may also be used to synchronously change frequency in multiple-module
systems.
Parameters
id is the VXI instrument session pointer returned by the hpe1437_init function.
cmplxDc selects either a phase continuous or phase reset transition when the freq = 0.
HPE1437_OFF, combined with a frequency change to zero, causes phase to be reset to
zero. HPE1437_ON, combined with a frequency change to zero, does not reset the
phase, thereby generating a complex DC measurement at baseband. The state of this
parameter does not affect any transition where freq≠ 0. Whether the real or complex
data is saved and ultimately sent to the output port is determined by the
hpe1437_data_type function.
cmplxDcPtr contains the value of the cmplxDc parameter.
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E1437A User's Guide
VXI plug&play Programming Reference
4-33
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