123
Agilent E1439 Programmer's Reference
Functions listed alphabetically
age1439_filter_sync
Synchronizes the decimation counter for multi-module systems.
VXI
plug&play
Syntax
#include "age1439".h
ViStatus age1439_filter_sync(ViSession
id
);
Description
This function causes the digital decimation counter to be reset by the next Sync line rising
transition. By calling
age1439_filter_sync
for every Agilent E1439 module using a shared ADC
clock, and then calling
age1439_meas_control
to cause a sync transition, the decimation counters
are prepared to start at the same time. Once this is done the decimation counters stay synchronized
as long as the same ADC clock is used. You do not need to resynchronize the decimation counters
when the digital filter bandwidths are changed.
Note
Resetting the decimation counter causes a transient in the digital filters. The transient takes about
30 decimated output sample periods to decay 100 dB. See the step response graphs in the
Technical Specifications for more detail.
Parameters
id
is the VXI instrument session pointer returned by the
age1439_init
function.
Comment
The correct procedure for using this command is:
1. Force all modules to idle using age1439_meas_control.
2. Call age1439_filter_sync for all modules.
3. Cause a sync transition with one module using age1439_meas_control without releasing
force to idle.
4. Release force to idle on all modules.
If you also want to synchronize frequency or phase see
age1439_frequency_setup
. This
procedure also applies to those commands for multi-module systems.
Example
The multichan.exe example program provides an example of how to correctly set up a multi-
module system with synchronous filters.
Return Value
AGE1439_SUCCESS
indicates that a function was successful.
Values other than
AGE1439_SUCCESS
indicate an error condition or other important status
condition. To determine the error message, pass the return value to
“age1439_error_message” on
page 102
.
Содержание E1439
Страница 6: ...6...
Страница 10: ...10 Contents...
Страница 11: ...1 1 Installing the Agilent E1439...
Страница 18: ...8 Installing the Agilent E1439 To transport the module...
Страница 19: ...2 2 Getting Started with the Agilent E1439...
Страница 28: ...18 Getting Started with the Agilent E1439 To use the example programs...
Страница 29: ...3 3 Using the Agilent E1439...
Страница 63: ...4 4 Agilent E1439 Programmer s Reference...
Страница 217: ...5 5 Module Description...
Страница 228: ...218 Module Description Block diagram and description...
Страница 229: ...6 6 Replacing Assemblies...
Страница 234: ...224 Replacing Assemblies Replaceable parts To remove the top cover...
Страница 235: ...225 Replacing Assemblies Replaceable parts To remove the M1 M2 assemblies...
Страница 236: ...226 Replacing Assemblies Replaceable parts...
Страница 238: ...228...
Страница 244: ...Index 234...