Agilent Technologies E1437A, User Manual, Page: 78 / 214

hpe1437_filter_sync
Synchronizes the decimation counter.
VXI plug&play Syntax
#include “hpe1437.h”
ViStatus hpe1437_filter_sync (ViSession
id
);
Description
This function causes the digital decimation counter to be reset by the next SYNC line
rising transition. Any measurement in progress is terminated and the module is placed
in the idle state. By calling
hpe1437_filter_sync
for every E1437 module using a
shared ADC clock, and then calling
hpe1437_meas_control
to cause a SYNC
transition, the decimation counters will be started at the same time. Once this is done
the decimation counters will stay synchronized as long as the same ADC clock is used.
It is not necessary to resynchronize the decimation counters when the digital filter
bandwidths are changed.
Parameters
id is the VXI instrument session pointer returned by the hpe1437_init function.
Comment
If you also want to synchronize frequency or phase, see hpe1437_frequency_sync and
multi module information.
Example
The program multichan.exe described in Example Programs provides an example of
how to correctly set up a multi-module system with synchronous filters.
NOTE
Resetting the decimation counter causes a transient in the digital filters. The
transient takes about 30 output sample periods to decay 120 dB. See the
impulse response graphs in the specification section for more detail.
Effect on Active
Measurement
This command aborts any measurement in progress when any parameter value is
changed.
See Also
hpe1437_init, hpe1437_filter_setup, hpe1437_frequency_setup , hpe1437_meas_control
E1437A User's Guide
VXI plug&play Programming Reference
4-31
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