Loop Tester Calibration keeps your measurements accurate, safe and defensible on every job. It confirms your loop tester reads Zs and Ze within tolerance. That helps you meet BS 7671 disconnection times and protect clients and circuits. Reliable readings also reduce costly retests and repeat site visits.
We complete a full intake and function check on arrival. Instruments are soaked to stable temperature and humidity before testing. We then verify accuracy using reference loop simulators across low and high impedances. Tests cover prospective fault current, two wire and three wire modes. Where possible we adjust and retest to bring results within limits. Each job ends with a traceable certificate and measurement uncertainties.
Our procedures follow ISO 17025 best practice with UKAS traceability available. You get clear pass or fail results that you can share with clients. We include visual inspection, terminal checks and lead continuity checks as standard. Labels are removed and replaced to avoid confusion on site. We clean housings and screens, and replace batteries when required.
Booking is simple and fast. Use our online form to schedule Loop Tester Calibration. Choose collection and return or drop off at our counter. We keep downtime short with a rapid turnaround as standard. The service supports dedicated loop testers and multifunction testers from leading brands. Join thousands of electricians who trust us to keep instruments honest. Your readings stay dependable, and your paperwork stays audit ready.
Why it matters: BS 7671 sets maximum Zs values for protective devices. Verifying Zs supports correct disconnection times and safety. Our reference equipment replicates loop conditions and compensates for supply impedance during tests. Certificates include before and after data, test points, uncertainties and technician sign off.
We share practical care tips to keep accuracy between calibrations and extend the service life of your tester too.