NABL Accredited · CC-2480 · Est. 2004 · Gujarat's Trusted Calibration Lab
NABL-accredited calibration for earth resistance testers (3T, 4T, clamp-on), PAT testers, and RCD testers. 0.01 Ω to 2000 Ω. IEC 61557-5. All makes.
±2%
Accuracy
0.01 Ω–2000 Ω
Range
IEC 61557-5
Standard
IEC 61557-5
Earth Resistance Measurement
NABL Accredited
CC-2480
— WHAT IS EARTH TESTER CALIBRATION —
Think of a quality lab that relies on an earth tester for daily measurements. If it has drifted even slightly from its true value, every reading becomes unreliable — leading to defective products, failed audits, or safety risks. Regular calibration is the only way to confirm your instrument is telling the truth.
Earth Tester calibration means comparing its readings against a NABL-traceable certified reference standard at multiple test points, recording the deviations, adjusting where possible, and issuing an NABL certificate — accepted by ISO 9001, IATF 16949, and all quality auditors.
Compare readings against a NABL-traceable reference standard across the full measurement range.
Adjust or document deviations so your instrument reads within accepted tolerance.
Issue a NABL-accredited certificate (CC-2480) with full traceability documentation.
— INSTRUMENTS COVERED —
3T / 4T / Clamp / Earth Continuity / PAT / RCD · All Makes · IEC 61557-5 · NABL
Standard earth ground resistance testers for earthing system verification.
Clamp-on earth testers for non-intrusive earth resistance measurement.
Fall-of-potential method earth testers for accurate ground resistance testing.
3-terminal earth testers for soil resistivity and earth electrode testing.
4-terminal Wenner method earth testers for soil resistivity measurement.
Earth bond testers for protective conductor and equipotential bonding verification.
— OUR PROCESS —
Earth tester received. Fall-of-potential (3T/4T), clamp, or continuity method identified. Test current and frequency documented.
Precision certified resistance standard connected in place of earth electrode terminals. For clamp testers: loop resistor fabricated at known resistance.
Earth resistance calibrated at 5 setpoints: 0.1 Ω, 1 Ω, 10 Ω, 100 Ω, 1000 Ω. AC injection method accuracy verified at each point.
For multifunction testers: RCD trip time (ms) and trip current (mA) verified at 30 mA and 100 mA thresholds against certified RCD reference.
Error at each calibration point documented. Expanded uncertainty (k=2) per GUM. Certificate lists all calibration points.
NABL CC-2480 certificate with resistance data, deviations, uncertainty (k=2), IEC 61557-5 traceability.
— STANDARDS & COMPLIANCE —
IEC 61557-5
Earth Resistance Measurement
IEC 61557-4
Earth Continuity / Protective Conductor
IS 3043 / IEC 60364
Earthing of Electrical Installations
ISO/IEC 17025
NABL Accreditation Standard
Prism holds NABL CC-2480 under ISO/IEC 17025:2017. Earth tester certificates accepted by ISO 9001, IEC 60364 electrical installation compliance, IS 3043, and all industry QMS audit bodies.
— NON-NABL CALIBRATION —
For routine maintenance, bulk calibration, or internal QC checks where a full NABL certificate is not mandatory — Prism offers cost-effective non-NABL calibration using the same NABL-traceable reference standards and trained engineers.
All non-NABL work uses NABL-certified reference standards — readings are still reliable and defensible.
Without full NABL documentation, instruments return faster — ideal for urgent production schedules.
Non-NABL calibration costs less — practical for large batches or routine periodic checks.
Available at your facility or at our Vatva lab — same quality, more flexibility.
— AREAS WE SERVICE —
Courier pick-up and delivery. Typical 1-day turnaround for earth testers.
Why Choose Prism
Since 2004, every NABL earth tester certificate from Prism has been accepted by ISO 9001, IEC 60364, and process industry auditors — no rejections.
— FAQ —
Get In Touch
Share the make/model, method (3T/4T/clamp), and quantity. We respond within 2 business hours.
— FROM OUR BLOG —
Current transformers (CTs) are the foundation of industrial energy metering and protection relay systems. NABL-certified CT calibration per IEC 61869-2 ensures accurate energy billing and reliable protection.
Read More
Power quality analysers are essential for BEE energy audits and power system troubleshooting. NABL-certified calibration ensures accurate power measurements for compliance and decision-making.
Read More
Digital multimeters (DMMs) are the universal electrical measurement tool. Annual NABL calibration ensures your DMM meets specified accuracy and your electrical measurements are traceable.
Read MoreNABL Accreditation Disclaimer
Calibration services are provided under NABL Certificate CC-2480 in strict accordance with our officially approved scope of accreditation (ISO/IEC 17025:2017). Parameters falling outside our active NABL scope are processed with standard metrological traceability to NPL/BIPM national standards.