NI 6110/6111/6115/6120 Calibration Procedure
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external standard of known accuracy to confirm that the product meets or
exceeds specifications. During adjustment, you correct the measurement
error of the device by adjusting the calibration constants and storing the
new calibration constants in the EEPROM. The host computer reads the
calibration constants, and the software uses them to compensate for errors
in the data and to present calibrated data to the user.
Why Should You Calibrate?
The accuracy of electronic components drifts with time and temperature,
which can affect measurement accuracy. Calibration restores these
components to the specified accuracy and ensures that the device still meets
NI standards.
How Often Should You Calibrate?
The measurement requirements of your measurement application
determine how often you should calibrate the device. NI recommends
performing a complete calibration at least once every year. You can shorten
this interval based on the demands of your application.
Equipment and Other Test Requirements
This section describes the equipment, software, documentation, and test
conditions needed for calibration.
Equipment
When calibrating an NI 6110/6111/6115/6120, NI recommends that you
use the following instruments:
•
Calibrator—Fluke 5700A
•
Digital Multimeter (DMM)—NI 4070
•
Counter—Agilent (HP) 53131A
If these exact instruments are not available, use the following accuracy
requirements to select substitute calibration standards:
•
A high-precision voltage source that is at least 50 ppm accurate
•
A multiranging 5 1/2-digit DMM accurate to within 15 ppm
•
A counter accurate to 0.01%
Note
If you do not have custom connection hardware available, you may need a connector
block, such as the NI TBX-68, and a shielded 68-pin connector cable. These components
give easy access to the individual pins on the 68-pin I/O connector.
