Calibration and Traceability


Calibration is the process of comparing an unknown quantity or value to a known quantity. It is essential to ensuring accurate measurements. To calibrate any piece of equipment, a traceable standard to the particular metrics being measured must be used.

Radian Research offers reference standards with various accuracy classes and applications.

The Primary Watthour Standard is the highest order reference standard maintained by an electric utility, manufacturer or laboratory. It is also referred to as a Master Standard, Company Standard or Gold Standard. All lower order standards in the company are periodically calibrated or certified against the Primary Standard.

Secondary Standards are used for testing working or field standards. Testing field standards against a secondary standard is simplified by using a comparator.





For the measurement of a reference standard to be accepted, it must be traceable. In practice you probably have seen statements like “Directly Traceable to NIST”. But what does it mean? First let’s look at the definition for metrological traceability: Property of a measurement result whereby the result can be related to a reference through a documented unbroken chain of calibrations, each contributing to the measurement uncertainty. ​

Traceability is not only desirable but a requirement per ISO/QS 9000 quality systems. Calibration and traceability requirements are often interpreted as only requiring a calibration sticker on the measuring equipment and the reference to a NIST test number on a calibration certificate. Of importance to note is that traceability is the property of the result of the measurement, not of a standard, calibration report or laboratory. Only the measurement result for a standard can be traceable, and only if the standard was appropriately maintained, used, and documented.​


Radian is ISO/IEC-17025:2017 (3784.01) accredited and offers calibration/verification services through its global network of CSP’s (Certified Service Partner). ISO/IEC 17025 is the General requirements for the competence of testing and calibration laboratories and is the standard for which most labs must hold accreditation in order to be deemed technically competent. In many cases, suppliers and regulatory authorities will not accept test or calibration results from a lab that is not accredited. Please see diagram on the right on how Radian maintains ISO/IEC 17025 accreditation and traceability to NIST/SI measurements.

Radian Research Chain of Traceability

What Radian Research Provides



Syntron Power and Energy Automated Calibration System
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RADIAN RX-30, RX-31 and RX-33 

Xytronic Three-Phase Reference Standard
+/- 0.04%, +/- 0.02%, +/- 0.01%

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RADIAN RX-20, RX-21 and RX-23 

Xytronic Single-Phase Reference Standard
+/- 0.04%, +/- 0.02%, +/- 0.01%

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Dytronic Primary Transfer Standard
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RD-22 Ultra

RADIAN RD-22 Ultra

Dytronic Primary Transfer Ultra Stable Standard
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RADIAN Calibration

(RADIAN Manufactured Equipment)

RADIAN Calibration

Calibration Service

(Non RADIAN Equipment)

RADIAN On-site Calibration

On-site Certification Service

Fully Customizable 

No solution fits your specific need. Bring us your challenge and let RADIAN Innovate™ a custom solution for you.

Radian Research listens and responds in a timely manner to customers problems, needs and wants. RADIAN Innovate™ offers innovative solutions to meet new meter testing and meter processing demands.

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