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How Can I Calibrate My DAQCard-700?

Hardware: Legacy DAQ Devices>>Multifunction DAQ>>DAQCard-700

Problem:
How can I calibrate my DAQCard-700?

Solution:
Calibration is a two-step process: first, the board measurements must be compared to known voltages in order to quantify any offset or gain errors as calibration constants. Second, these offset or gain corrections must be stored and applied to any subsequent measurements made by the board.

In the case of the DAQCard-700, the calibration constants are determined and stored on board in an EEPROM at the factory. Thereafter, these constants are factored into all measurements made by the card.

For the DAQCard-700, there is no software support to write new coefficients to the EEPROM when the card is in the field. If you doubt the integrity of the calibration constants, you can perform the following tests to verify them:

  • To Verify the OFFSET Correction Coefficient
    Short Inputs to ground to achieve a 0 V input and verify that the measurement is less than +/- 1 LSB.
  • To Verify the GAIN Correction Coefficient
    Use a NIST traceable calibrator of 0.01% accuracy or better and compare the measurements from the board.
Published performance of the card with respect to gain errors and offset errors can be found in the Catalog or User Manual. If the above two test results yield acceptable results, the EEPROM contains valid correction coefficients and do not need to be updated.

Note: The board is now too old to be sent to National Instruments for a factory calibration. It can, however, be sent in as an RMA or repurchased on the website.

Related Links:
Product Manuals: DAQCard-700 User Manual
DAQCard-700 Register-Level Programming Manual
How Do I Self-calibrate a DAQCard-700?    
Calibration Solutions from National Instruments

Attachments:





Report Date: 04/20/1998
Last Updated: 12/17/2007
Document ID: 18JGEKQA

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