Age1439_input_autozero – Agilent Technologies VXI E1439 User Manual
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Agilent E1439 Programmer's Reference
Functions listed alphabetically
age1439_input_autozero
Nulls out the input dc offset voltage (applies to baseband input configuration only).
VXIplug&play Syntax
#include "age1439".h
ViStatus age1439_input_autozero(ViSession id);
Description
age1439_input_autozero updates a table of dc offset corrections to be used with each signal
path. The applicable correction from this table is automatically added to the input offset parameter
to achieve the correct dc offset value. Because of the length of time needed to execute this
function, it is not automatically called when the module is reset. Thus, the user program is
responsible for explicitly initiating the auto zero. This function should be called at least once after
the temperature of the module has stabilized. The interval between calls after that depends on the
importance of dc accuracy in the user application. It is not necessary to call the auto zero function
for every change of input setup parameters since the correction table maintains values for all setup
conditions.
Note
Calling age1439_input_autozero aborts any measurement already in progress and eliminates LO
phase coherence and filter synchronization in a synchronous multi-module system. See the
age1439_filter_sync and age1439_frequency_sync functions for details on how to re-establish
LO phase coherence and filter synchronization.
Calling this function deletes any saved state and halts any measurement or fiber transfer.
Parameters
id
is the VXI instrument session pointer returned by the age1439_init function.
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
.
See Also
“Commands which halt active measurements” on page 198
,
“age1439_input_setup” on page 141