Test Equipment Calibration & Repair

Caltest Instruments offers calibration for a whole range of electrical equipment and not just those that we sell or hire, so contact us by filling out the Calibration Service Form.
Our calibration team offers a field service capability and makes site visits to carry out calibrations.

Our accreditation is limited to those activities described on our UKAS Schedule of Accreditation (PDF).
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UKAS Calibration number
We calibrate and service a wide range of electrical and electronic test equipment including AC and DC power supplies, programmable electronic loads, power analysers, battery test systems, hipot and safety testers, precision meters, and energy metering equipment.
Calibration Service FormCalibration CertificationSchedule of Accreditation

We offer UK and Ireland service and calibration for most of the products of these manufacturers

Don't see your brand here? We may still be able to calibrate and service your equipment—contact us to check
Explore Adaptive Power Systems’ AC/DC sources and loads—available from Caltest UK, with full calibration services for precision performance.
Discover CAEN ELS power supplies—available from Caltest UK, with professional calibration services for scientific and industrial use.
Explore Associated Research hipot testers—available from Caltest Instruments UK, with expert calibration services for compliance and safety.
Explore Höcherl & Hackl electronic loads—available in the UK from Caltest Instruments, with in-house calibration services for reliability.
Discover Krohn-Hite precision filters and amplifiers—available from Caltest UK, with professional calibration services included.
Explore Kepco DC power supplies—available via Caltest UK, with full calibration support to ensure optimal performance and accuracy.
Discover Zenone’s battery test systems—available from Caltest UK, with expert calibration to support EV and energy storage testing.
Authorised Pacific Power Source distributor in the UK. Programmable AC power sources, regenerative grid simulators, frequency converters & electronic loads — all available with UKAS calibration from Caltest Instruments.
Discover SCI hipot testers—available from Caltest UK, with trusted calibration services for compliance in safety-critical testing.
Explore STS Instruments’ battery testers—available from Caltest UK, with calibration services for consistent R&D and production results.
Discover ZERA precision meters and calibration systems—available in the UK via Caltest Instruments with full calibration support.
Browse Cinergia’s regenerative power sources—available from Caltest UK, with calibration services to ensure test accuracy and efficiency.
Discover Nebula battery cyclers—engineered for precision, available from Caltest Instruments UK with full calibration support.
Explore GW Instek’s measurement instruments—available from Caltest UK, where we also offer expert calibration for all supported models.
Authorised Elektro-Automatik distributor in the UK. Programmable DC power supplies, bidirectional supplies, regenerative electronic loads & battery test systems — with UKAS calibration from Caltest Instruments.
NI has made all NHR products obsolete, here at Caltest we can still calibrating and/or service your NHR products (9300). We can also offer alternatives.
Browse Zahner Potentiostats and systems for photoelectrochemical/photovoltaics — available through Caltest UK, with calibration services.
We provide certified calibration for Yokogawa meters, scopes, and power analyzers used in industrial automation.
Accurate calibration for MTE power quality and energy test equipment—trusted by utility and metering industries.
We calibrate Kikusui power supplies, loads, and test systems to deliver accurate and consistent test results.
Calibrate your Voltech power analyzers and testers with our accredited services for reliable power measurements.
Expert calibration for California Instruments AC/DC power sources and grid simulators to maintain test integrity.
Professional calibration of ITECH electronic loads and power supplies—ideal for lab and production use.
Certified calibration for Landis+Gyr energy meters and grid devices—supporting smart grid and utility accuracy.
We calibrate Arbin battery test systems to ensure precise performance in energy storage and battery research.
Certified calibration of Chroma power sources, loads, and test systems for high-accuracy electronic testing.
We offer precise calibration for Prodigit power meters, loads, and test systems used in electronics testing.
Maintain peak performance of Regatron power supplies and regenerative systems with our expert calibration.
Calibrate your Neware battery testers with us to ensure reliable data for R&D and production environments.
Ensure precision with our calibration of Meatest multifunction calibrators and measurement instruments.
We calibrate and service TDK-Lambda power supplies and electronic test equipment—ensuring accuracy, reliability, and compliance across your systems.
  • Adaptive Power Systems
  • Associated Research
  • CAEN ELS
  • Cinergia
  • H&H
  • NH Research
  • Pacific Power
  • STS Instruments
  • Zenone
Calibration Service FormContact us

Electrical Equipment Calibration

Our environmentally-controlled UKAS-accredited calibration laboratory offers a range of electrical equipment service and calibration, from a certificate of calibration traceable via our own standards to National Physics Laboratory, to a full UKAS accredited calibration. Combined with our modern service facility we can offer full service for all types of electrical and electronic instruments.

Our calibration laboratory is accredited by UKAS for DC and LF measurement, with particular focus on AC power and energy, both active and reactive measurements.

Please see our UKAS Schedule of Accreditation (PDF). Please note that items not covered by our Schedule of Accreditation may still be calibrated but they will not be covered by our UKAS accreditation. Please contact our calibration team for details.
Although Caltest Instruments UKAS Schedule of Accreditation and laboratory capabilities have a focus towards the calibration of power and energy standards, working standards, electric meter testing and associated equipment in the electricity supply industry, our UKAS accreditation and calibration laboratory covers a large range of AC power sources and electronic and electrical test equipment.

The majority of the laboratory’s capabilities are derived from basic principle, using primary standards, some of which have over 30 years of traceability. This method offers a high level of stability and accuracy. Our calibration staff have a combined experience of over 50 years in UKAS accredited calibration laboratories and are available for advice on all calibration subjects.

Repair Service

Caltest Instruments offer electrical equipment repair, service, and calibration on all of the products that we provide as well as equipment not represented or sold by Caltest. If you have electrical equipment that requires repair then please contact our service team; they have been trained by all our major principals and have extensive knowledge in the service of AC and DC power, metering test equipment and general purpose test and measurement equipment.The service team offers a field service capability so can make on-site visits to carry out equipment repairs.

If you have any further questions, please complete the Calibration Service Form.
Calibration Service Form

Frequently Asked Questions

What is UKAS calibration and do I need it?

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UKAS calibration is performed by a laboratory assessed against ISO/IEC 17025, the international standard for testing and calibration laboratories. A UKAS-accredited calibration certificate provides independently verified, traceable measurements — traceable back to national standards held by the National Physical Laboratory (NPL). You typically need UKAS calibration when your quality management system (e.g. ISO 9001), industry regulations, or customer contracts require accredited, traceable measurements. If your equipment is used for compliance testing, safety-critical measurements, or regulatory submissions, UKAS calibration gives you the documented assurance that auditors and customers expect.

How often should I calibrate my test equipment?

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Most electrical test equipment — including power supplies, electronic loads, power analysers, and safety testers — should be calibrated at least once a year. However, the right calibration interval depends on several factors: how frequently the equipment is used, the manufacturer's recommendations, the stability of previous calibration results, and any requirements set by your industry regulations or quality system. Equipment used in demanding environments or for safety-critical testing may need more frequent calibration. Our calibration team can advise on the best interval for your specific instruments.

Can you calibrate equipment you don't sell?

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Yes. We calibrate and service electrical test equipment from over 30 manufacturers, regardless of where it was originally purchased. This includes brands we represent — such as Pacific Power Source, Elektro-Automatik, GW Instek, and Associated Research — as well as third-party equipment from Chroma, Kikusui, Yokogawa, Keysight, Fluke, TDK-Lambda, and many others. If your instrument isn't listed on our site, contact us — we can usually help.

What is your calibration turnaround time?

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Standard calibration turnaround is 5 to 10 working days from receipt of your equipment, when pre-booked with an RMA number. If you have an urgent requirement — for example, a production line waiting on a calibrated instrument — we offer express and priority services. Contact our service team to discuss turnaround for your specific equipment.

Do you offer on-site calibration?

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Yes. Our field calibration team provides on-site UKAS ISO 17025 accredited calibration across the UK and Ireland, with international visits available by arrangement. On-site calibration is ideal for large or rack-mounted test systems — such as high-power AC/DC power supplies and electronic loads — where shipping is impractical, or when minimising equipment downtime is critical to your operations. Our engineers bring portable reference standards and can calibrate most instruments in your facility.

What calibration certificate will I receive?

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You will receive either a UKAS-accredited calibration certificate or a traceable calibration certificate, depending on the equipment type and your requirements. A UKAS certificate carries the UKAS logo and is recognised internationally under mutual recognition agreements — it provides the highest level of assurance for audits, regulatory submissions, and quality systems. A traceable certificate confirms calibration against standards traceable to the National Physical Laboratory but without UKAS accreditation. Our team will recommend the appropriate certificate for your instrument and application.

How do I send my equipment for calibration?

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Start by completing the Calibration Service Form on this page to request an RMA (Return Merchandise Authorisation) number. Once you have your RMA, pack your equipment securely and ship it to our laboratory in Petersfield, Hampshire, with the RMA number clearly marked. If you prefer, we can arrange collection from your site. When your equipment arrives, our service team will confirm receipt, provide an estimated completion date, and contact you if any additional work is needed beyond the original request.

Calibration Service Form

Please fill in the form below to request your RMA number.

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