User`s guide

4-230 Agilent E6432A Microwave Synthesizer User’s Guide

HPE6432_SetVbloDac

ViStatus HPE6432_SetVbloDac (ViSession instrumentHandle,

ViUInt16 vbloDac);

Purpose

This function sets a value for the Vblo DAC.

The Vblo DAC is initially set to 2048 and has a range from 0 to 4095.

The Vblo DAC is used to adjust the voltage bias that is applied to the

mixers within the I/Q modulator assembly. Vblo has some affect on the

I/Q modulator conversion loss. Some improvement may be possible, but

the default setting should usually be used. Avoid values below 1000 as

this can cause the mixers to become under biased and distort.

Factory Preset Value: 2048 (Recommended)

Parameter List

instrumentHandle

Variable Type ViSession

This is the ViSession handle that is obtained from the Initialize

function. The instrumentHandle identifies a particular instrument

session.

vbloDac

Variable Type ViUInt16

This parameter specifies a value for the Vblo DAC.

Allowable values: 0 to 4095

Return Value

This parameter reports the return status of this function.

To obtain further information about the status that is returned, call the

Error Message function or refer to “Error-Code and Fail-Code

Messages” on page 3-93.