How to Set Aperture Time in NI-DMM

[Margaret F.]

Overview

This example shows how to manually control aperture time for a DMM in LabVIEW.

Description

When a DMM is set to Auto-Range, it may not take advantage of all of its digits of resolution. For instance, the 4065 is a 6.5 digit DMM; however, when the DMM is used in Auto-Range mode, only 5.5 digits are used. The Aperture Time Property Node can be used to increase the aperture time to the match the aperture time for 6.5 digits so that Auto-Range can be used but a 6.5 digit measurement can be obtained.

Requirements

Software

LabVIEW 2012(or compatible)
NI-DMM driver which is compatible with your hardware and version of LabVIEW

Hardware

NI DMM Device

Steps to Implement or Execute Code

     1. Download and open the example VI

     2. Configure the following settings in the block diagram:

• The Instrument Descriptor (Which DMM you are using)
• Which type of measurement you are performing
• The new aperture time, constant is currently 0.2 for this example

     3. Run the VI

     4. Observe on the front panel the aperture time for 5.5 and 6.5 digits

Additional Information or References

Block Diagram

**This document has been updated to meet the current required format for the NI Code Exchange.**