17 Testing and Calibration Laboratory
Research and Calibration Laboratory of SONEL SA offers calibration of the following instruments
used for electrical/non-electrical measurements:
- meters for electrical protective measurements: insulation resistance, impedance and resistance
of short-circuit loops, earthing resistances and earth resistivity, RCD parameters and multi-
functional meters that perform the above functions,
- electrical safety meters,
- multimeters,
- power quality analysers,
- meters for measuring low resistance values,
- infra-red cameras,
- pyrometers,
- luxmeters.
In addition, the Laboratory performs voltage, current and resistance calibration.
A calibration certificate is a document confirming compliance of parameters declared by the manufac-
turer of tested device with national standards, specifying the measurement uncertainty.
Pursuant to standard EN ISO 10012:2003 "Measurement management systems — Requirements for
measurement processes and measuring equipment", SONEL S.A. recommends for its instruments to
be periodically tested, observing the interval of 13 months.
For new devices with calibration certificates, the next metrological inspection (calibration) is recom-
mended within 13 months from the date of purchase, but not later than 19 months from the date of
manufacture.
Note:
In case of instruments used for tests related to the protection against electric shock,
the person performing measurements should have complete confidence in the effi
ciency of operated apparatus. Measurements carried out with malfunctioning meter
may cause wrong assessment of tested equipment in terms of its protection features
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