Agilent Technologies E1439 User Manual page 144

Vxi 70 mhz if adc with filters and memory

Table of Contents

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

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

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

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