Calibration & Calibration Verification

May 29, 2019

For the VR9500 and the ObserVR1000, calibration is the process of setting adjustments to measured voltage and frequency readings, based on a reliably precise internal reference voltage. The key word is adjustment, minute changes to those measured readings so they are always within a small, clearly established tolerance.

The calibration process is performed on every hardware unit, in the lab at the Vibration Research, before that unit is shipped.

Calibration verification is the process of running a set of tests to establish whether or not the measurement adjustments established during Calibration are functioning properly. Essentially, it checks that a hardware unit is still measuring voltages and frequencies within acceptable tolerances.

The calibration verification process is also performed on every hardware unit in the lab at Vibration Research, before that unit is shipped, as a check to ensure the calibration was performed properly and that the unit is not defective.

Vibration Research recommends that our customers implement an annual Calibration Verification for VR9500 and ObserVR1000 systems. See the Procedure lesson for details on how to do it.

Tools for Calibration Verification

The Keysight 34470A Digital Multimeter

During calibration verification, voltage and frequency measurements from a VR9500 or ObserVR1000 hardware unit are compared to measurements from an approved Digital Multimeter (DMM), to ensure that the hardware unit’s measurements are within an established tolerance across a specified voltage range and set of sample rates. The DMMs currently  supported by VibrationVIEW 2019 are the Keysight model numbers 3458A, 34401A, 34410A, 34461A, 34465A, 34470A. Vibration Research adds support for newer DMMs as they become available to the public.

The VibrationVIEW and ObserVIEW software packages include modules to initiate and control the calibration verification process.