Intercomparison of 100 mH inductance standards

Project Description

This comparison is a follow-up of project 607. Due to the good behaviour of the travelling standard, it has been decided to organise a follow-up comparison extended to all the interested Institute. It is expected that those Institutes that have already participated in project 607 with satisfactory results will not take part in this comparison.

The same 100 mH thermostated inductance standard will be used, after having slightly changed the value of the standard. The measurements will be carried out following the same technical protocol as in project 607.

This comparison is aimed to be a supplementary comparison in support of the Calibration and Measurement Capabilities of the participants.

To reduce the workload of the pilot laboratory, it is proposed that the organisation of this comparison is shared among at least three partners. A division of tasks is proposed as follows:

  • INM: is responsible for the schedule and keeps track of the travelling standard
  • PTB: performs the pilot measurements on the travelling standards to determine their behaviour during the comparison
  • VSL: collects the results, performs the data analysis and prepares the draft/final reports
  • INRIM: provides one of the travelling standards and assists in preparing the technical protocol

Final Report 2011-12-13

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

Within the framework of EURAMET, a comparison has been organized of measurements of self-inductance at 100 mH and 1 kHz. The comparison is identified as EURAMET.EM-S26.

Two 100 mH inductance standards, encased in a thermostatic controlled enclosure were circulated among the participants. The results from 10 out of 16 participants are in agreement with the reference values. A majority of the results agrees within ±50 µH/H.
The participants reported four different methods to realise the traceability of the unit of inductance. The results from these different methods are in good agreement within the reported uncertainties.

The results of this comparison have been linked to the results of the EUROMET.EM-S20 comparison.

The organisation of the this comparison has been a successful exercise of sharing the workload among four different institutes and can be example to future comparisons.

Progress Report 2006-09-27

This intercomparison is a follow-up comparison of EUROMET.EM-S20 , EUROMET project 607. A 100 mH inductance standard will be circulated. The measurement is to be made at the frequency of 1000 Hz, a measurement current of 1 mA and a temperature of 23 °C.

Executive Report