Chapter 1 Getting Started
NI USB-621x User Manual 1-2 ni.com
Device Self-Calibration
NI recommends that you self-calibrate your USB-621x device after
installation and whenever the ambient temperature changes.
Self-calibration should be performed after the device has warmed up for the
recommended time period. Refer to the NI USB-621x Specifications to find
your device warm-up time. This function measures the onboard reference
voltage of the device and adjusts the self-calibration constants to account
for any errors caused by short-term fluctuations in the environment.
Disconnect all external signals when you self-calibrate a device.
You can initiate self-calibration using Measurement & Automation
Explorer (MAX), by completing the following steps.
1. Launch MAX.
2. Select My System»Devices and Interfaces»NI-DAQmx
Devices»your device.
3. Initiate self-calibration using one of the following methods:
•Click Self-Calibrate in the upper right corner of MAX.
• Right-click the name of the device in the MAX configuration tree
and select Self-Calibrate from the drop-down menu.
Note Yo u can also programmatically self-calibrate your device with NI-DAQmx,
as described in Device Calibration in the NI-DAQmx Help or the LabVIEW Help in
version 8.0 or later.
Device Pinouts
Refer to Appendix A, Device-Specific Information, for USB-621x device
pinouts.
Device Specifications
Refer to the NI USB-621x Specifications, available on the NI-DAQ Device
Documentation Browser or from
ni.com/manuals, for more detailed
information about USB-621x devices.
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