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Understanding Non-Repeat

  • Overview +


    A test that can not be reliably repeated is of little value.

    Gauge R&R (repeatability & reproducibility) is one of the most important aspects of a gauging fixture. Good repeatability is one of the most difficult functions to achieve when building a gauging probe, which is why Solartron has invested so much in the Manufacture of Bearings and shielding against electrical interference.

  • Determining Non Repeat +


    It is relatively simple to determine good repeatability from a gauging probe by gently lifting the tip and allowing it to gently return to it's start position. A number of probe manufacturers use this method or fail to quote non repeat at all.

    Unfortunately, apart from a few laboratory applications, such as Gauge Block Calibration, the vast majority of applications are a lot more demanding.

  • Understanding Non Repeat Electrical +


    Electrical noise or cross talk can have a significant negative effect to both Non Repeat and Accuracy when using any conventional LVDT or Half Bridge Gauging Probe.



    Noise levels are often related to the number of probes installed and can have a significant effect on gauge R&R.

    Solartron Metrology takes special care to ensure that with it's shielded construction, it's Analogue Gauging Probes are as immune as possible to external electrical interference. However, as a component no LVDT or Half Bridge Gauging Probe can, on it's own, obtain CE certification for noise immunity or emission.

    It is the responsibility of the system builder to obtain CE certification for any complete system that incorporates Analogue Gauging probes.

    Solartron Metrology’s Orbit® Network and Digital Gauging Probes provide improved Gauge R&R through cleaner signals and better electrical noise immunity:

    Solartron Digital Probes Conform to EN 61000-6-2 and have been independently approved for CE certification.

  • Understanding Non Repeat Pneumatic Gauging Probes +