Supplementary comparison on calibration of a transducer 60 mm

Project Description

Displacement errors of a transducer shall be measured. An incremental length transducer with measurement range of 60 mm with 10 nm resolution is used in the comparison. The measurement force of the transducer is generated by gravity and was not exactly determined prior to the comparison. The transducer is equipped with a digital display.

Displacement errors shall be measured in 10 measurement points distributed along the whole measurement range. Participating laboratories shall apply normal calibration procedures that are used for clients.

Final Report 2024-01-31

The comparison has been completed and results are available in the KCDB.

Progress Report 2023-10-02

At its meeting October 2020, the EURAMET Technical Committee for Length (TC-L) decided to perform a supplementary comparison on precise linear transducers with MIRS/UM-FS/LTM (Slovenian DI for length) as the pilot laboratory. The comparison was registered in the KCDB in December 2020. Technical protocol was issued in March 2021. All participants have performed measurements in the term from March 2021 to July 2022. No special issues were detected during measurements and transportation. Five out of nine participants have more than 95 % of En values within the acceptance limits (En £ 1,0). Four participants don't meet the equivalence criterion with no significant indication on the reason for this. These participants have used different types of equipment and different orientations of the transducer (2 labs in horizontal and 3 labs in vertical position). They have performed the measurements in very different time intervals. Therefore, no time related influence can be indicated.

Draft A.1 report was issued on 6 January 2023, Draft A.2 on 17 January and draft A.3 on 4 September 2023. Draft B is in the progress

IPQ (Portugal) has left this project.

Progress Report 2022-05-20

The project was agreed at the EURAMET TC-L meeting in October 2020. Version 1 of the technical protocol was issued in December 2020 and sent to all potential participants for discussion. Final technical protocol (Version 5) was issued on 11 March 2021 (8 participants). Initial measurements started in March 2021 in the pilot laboratory MIRS/UM-FS/LTM.
At the EURAMET TC-L meeting in October 2021, VTT MIKES from Finland expressed a wish to join the project. BEV (Austria) and VSL (Netherlands) expressed a wish to repeat their measurements due to some technical issues. After getting confirmation from all participants, Version 5 of the (amended) technical protocol was issued. We have added VTT MIKES to the participants and the circulation scheme was updated.
Until now, all participants except VTT MIKES have performed the measurements.

The transducer is in the pilot laboratory at the moment since it had to be repaired. It is expected to send it to VTT MIKES until the end of May, sothe final measurements will be performed in June 2022.