External Calibration

NI High-Speed Digitizers Help (NI-SCOPE)

Edition Date: January 2017

Part Number: 370592AB-01

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External calibration involves both verification and adjustment. Verification is the process of testing the device to ensure that the input accuracy is within certain specifications. You can use verification to ensure that the adjustment process was successful. If verification is not successful, perform the adjustment procedure and retry the verification procedure. After a successful verification, update the calibration date using MAX or the Set Verification Date and Time VI.

Adjustment is the process of measuring and compensating for device performance to improve the input accuracy. The device is warranted to meet or exceed its published specifications for the duration of the calibration interval.

National Instruments recommends a calibration interval of two years for the NI 5170R/5171R. Your application may have different calibration interval requirements based on its measurement accuracy demands. You can change the calibration due date with MAX or the Set Calibration Due Date VI.

For the NI 5170R/5171R, external calibration yields the following benefits:

  • Corrects for DC gain and offset errors within the oscilloscope by comparison to a precision, high-stability external voltage reference. This is done for all ranges and all filter paths (enabled/disabled).
  • Corrects for DC offset errors within the oscilloscope for the AC coupling paths.
  • Calibrates internal Sample Clock frequency to ensure accurate sample rate by comparison to a precision, high-stability external reference frequency.

Your device must be externally calibrated at least once every two years in order to maintain adherence to published specifications.

Calibration procedures may be found online at ni.com/manuals.

You can learn more about external calibration at ni.com/calibration.

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