Calibration of measuring instruments of AC and DC electrical quantities
Accredited calibration services for electrical instruments, fully traceable to national and international standards.
Accredited calibration services for instruments measuring electrical quantities, with demonstrated metrological traceability. Our calibration laboratory performs calibration of AC and DC electrical quantities under accreditation granted by the Slovak National Accreditation Service (SNAS) in accordance with ISO/IEC 17025:2017, the accreditation is internationally recognized under the ILAC MRA agreement.
For each calibrated item we issue a calibration certificate including the measured values, associated expanded measurement uncertainty, the conditions of measurement, and a statement of metrological traceability.
We calibrate instruments for the measurands:
- DC voltage and DC current
- AC voltage and AC current (power frequency and specified frequency bands per scope)
- Electrical resistance (using resistance meters/standards/decades)
Typical instruments we calibrate:
- Inspection and safety testers
- Portable multimeters (up to 6½-digit)
- Voltmeters and ammeters (digital and analog)
- Resistance meters and decade boxes
Measurement ranges
- DC voltage: 0.01 mV – 6000 V
- AC voltage (≈40–1,000 Hz / 50 Hz): 0.1 mV – 6000 V
- DC current: ~10 µA – 20 A
- AC current (50 Hz): ~10 µA – 20 A
- Resistance: 0.001 Ω – 100 MΩ
Brands & Devices we calibrate most often
Fluke
Multifunction installation testers (MFT); insulation resistance testers; loop/line impedance testers; RCD testers; earth resistance/ground testers; continuity/low-ohm meters; phase sequence testers
Metrel
Multifunction installation testers; PAT/appliance testers; insulation resistance; loop/line impedance; RCD testers; earth resistance/ground testers; continuity/low-ohm meters; phase sequence testers
HT (HT Italia)
Multifunction installation testers; RCD testers; insulation resistance; earth resistance/ground testers; loop impedance; continuity/low-ohm meters; phase sequence testers
Illko
Appliance/PAT testers and multifunction “revizní” instruments for inspections per local standards (e.g., REVEX series)
Electron
Multifunction installation testers; RCD testers; insulation resistance; earth resistance/ground testers; loop impedance; continuity/low-ohm meters; phase sequence testers
Note:
The scope of accreditation, together with the associated uncertainties, is provided in the appendix.
Upon agreement, and within our technical capabilities, we can also calibrate instruments beyond the accredited scope as non-accredited measurements. In such cases, proof of traceability to international SI units will be provided.
Jaroslav Vrábel
Frequently Asked Questions
What instruments measuring electrical quantities do you calibrate?
We calibrate measuring instruments of AC and DC electrical quantities and electrical resistance—including portable and bench voltmeters, ammeters, multimeters (digital and analog, up to ~6½-digit), electrical installation safety testers (insulation resistance / loop / RCD), clamp meters (power frequency), resistance meters, and resistance decade boxes.
Coverage is provided within the accredited scope defined in the Annex to our ISO/IEC 17025:2017 accreditation. If a specific model or range falls outside the Annex, we can provide a clearly identified non-accredited calibration.
Are you accredited and are results traceable?
Yes. Our laboratory is accredited in accordance with ISO/IEC 17025:2017 for measuring instruments of DC and AC electrical quantities; our accreditation is recognized under the ILAC MRA. All calibrations are performed with demonstrated metrological traceability to SI units via national/international standards, and your calibration certificate states the measured values, associated expanded measurement uncertainty, conditions of measurement, and a statement of metrological traceability.
How do I submit my instrument and what will I receive back?
Please include the instrument itself, the required accessories/leads, and a list of the requested ranges and measurement points; clean the instrument and pack it securely.
After calibration you will receive a calibration certificate, a calibration label, and on request a statement of conformity to your specified tolerances. If we detect an issue (e.g., damage or drift), we will contact you.
How often should I calibrate?
Calibration intervals depend on how the instrument is used, the criticality of the measurement, the operating environment, and the instrument’s historical stability. Many organizations start with a 12-month interval and then adjust it to their needs. We can advise you on how to set or optimize these intervals.