Calibration of inductance

Purpose

RISE's calibration at the National Laboratory for electrical quantities is available to customers who require the best possible accuracy in their calibration or have requirements which involves development of new calibration methods. Our customers are found among industry, research institutes, and calibration companies. The national reference standards at the National Laboratory have the highest level of accuracy in Sweden. The traceability to the realisation of the unit is always ensured.

Calibration at a National Laboratory meets all the typical requirements for traceability and accreditation commonly found in industry and society at large.

Method

The calibration resources for inductance are in the range 10 pH - 100 H. The most commonly used method for calibration of inductance standards in the range 1 µH - 10 H is substitution measurements when the calibrated object is compared to a standard with known value and with the same nominal value. Such measurements are performed with an LCR meter. Calibration can be performed at frequencies up to 10 kHz. The measurement uncertainty is at best 100 µH / H at 1 kHz.

Calibration can also be carried out with an inductance measuring bridge for better measurement uncertainty. The most common measurement frequency is 1 kHz, but calibration can, in some cases, be performed at other frequencies, up to 10 kHz. The measurement uncertainty is at best 40 µH / H at 1 kHz.

Inductance bridges and LCR meters are calibrated by measuring against primary and / or secondary inductance standards. Calibration can be performed at frequencies up to 10 kHz (or in some cases higher).

Calibration of inductive voltage dividers can be performed in the range 50 Hz - 10 kHz. The measurement uncertainty is at best 1.2 · 10^-7 for in phase ratio and 3.0 · 10^-7 for quadrature error at 1 kHz.

Other types of measurements can also be performed, for example, measurements of temperature coefficients.

The measurement uncertainty given for a calibration depends, in addition to the calibration equipment’s performance, also on the calibration object’s performance (stability, temperature coefficient, voltage dependence and so on). In most cases, a preliminary estimate of the measurement uncertainty can be given from experience before the calibration.

Deliveries

Delivery upon agreement with customer. The results of the calibration are reported in a calibration certificate.

When becoming a client you will also get access to our customer website for calibration, where you may also place orders. 

Customer website for calibration