Service Icon Dynamic Rotation

Round robin tests

The foundation for competence and reliability.

Along with procedures for guaranteeing internal quality, regular participation in interlaboratory comparisons (also known as round robin tests or intercomparisons) is legally required for accredited laboratories.

This requires that laboratories, in complying with the DIN EN ISO/IEC 17025 standard or to maintain national approval procedures, must regularly participate in so-called round robin tests. The purpose of this is to secure constant and high quality of results and to offer reliable proof of competence to both customers and authorities.

SPEKTRA is accredited in accordance with the ISO/IEC 17043 standard and regularly participates in interlaboratory comparison (ILC) programs for different measurands or calibration methods.


Round robin tests with SPEKTRA: everything from a single source

  • We are accredited and regularly participate in interlaboratory comparisons and round robin tests
  • We have worked hand-in-hand with renowned national meteorological institutions (NMIs) for decades
  • We constantly set new standards – in calibration, quality and reliability
  • Systems and components with the lowest possible measurement uncertainty are developed and manufactured by us in Germany

Implement your round robin tests with SPEKTRA. In our DAkkS-accredited calibration laboratory and with more than 25 years of experience.

Would you like to initiate a round robin test or take part in an interlaboratory comparison? For whatever challenges you are facing, put your trust in our meteorology experts. Ensure that your measurement system is equipped with high-precision and properly calibrated material – let SPEKTRA support you.

With components such as exciters, controllers and amplifiers. From hardware and software to complete system solutions from a single source. With accredited calibration service in our laboratories... and much more!

What is a round robin test?

A round robin test or interlaboratory comparison (ILC) is a type of performance test for accredited measurement and test laboratories. It  is a method of external quality assurance for measurement procedures and laboratories. During the trial, identical devices under test are examined by different research institutions using similar or different methods.

The comparison of measuring results between the participating institutions makes it possible to form conclusions about measurement accuracy in general and also about the quality of the measurements of each of the participants.

Additionally, an ILC can be used to validate the specifications for measurement procedures.

Image: A typical ILC with SPEKTRA as the pilot laboratory and a series of comparison laboratories

What are the benefits of such a comparison?

Round robin tests, also known internationally as interlaboratory comparisons (ILC) or intercomparisons, are used in the following situations:

  • Quantitative surveys
  • Quality assurance of laboratory investigations and measurements
  • Determining measurement accuracy of a measurement procedure
  • Determining measurement and tolerance values
  • Determining the decision-making rules for conformity assessments
  • Comparison of calibration processes with other laboratories
  • Standardization of tests and procedures
  • Fulfilment of requirements under ISO 17025:2018
  • Proof of competence for customers, superiors and authorities

Our ILC service range

ILC vibration secondary

Intercomparison for the measurand vibration in low, medium and high frequency ranges.

Reference with frequency range

  • CS ILC VLF – 0,4 Hz…160 Hz
  • CS ILC MF – 5 Hz…10 kHz
  • CS ILC HF – 10 Hz…20 kHz

(VLF = very low frequency / MF = medium frequency / HF = high frequency)

ILC vibration primary

Primary laser round robin test for the measurand vibration in the high and low frequency ranges.

Reference with frequency range

  • CS ILC Primär HF – 5 Hz…20 kHz
  • CS ILC Seismic – 0,05 Hz...160 Hz

(HF = high frequency)

ILC shock secondary

Reference with frequency range

  • CS ILC LMS – LS: 20g…200g oder MS: 300g…5.000g
  • CS ILC DTI – LS: 20g…200g

(LMS = low medium frequency / DTI = digital transducer interface)

ILC acoustic secondary

Intercomparison for acoustic measurands and measuring equipment.

Reference with frequency range

  • CS ILC MicP – 31,5 Hz…16 kHz
  • CS ILC MicFF –125 Hz…20 kHz
  • CS ILC for sound calibrators and pistonphones, depending
    on the operating point of the reference device under test

(MicP = microphone primary / FF = free field)

ILC signal conditioners

Round robin test for signal conditioners in low through to very high frequency ranges in alignment with the client or participant.

  • CS ILC ESC – 0,2 Hz…50 kHz
  • or in alignment with the operating range of the customer

(ESC = electrical signal conditioner)

Who can participate in an ILC?

Any number of laboratories can take part in an interlaboratory comparison. Research institutions with multiple measurement systems can also take part in a round robin test.

Ideally, most participants are accredited for the measurand in question. In addition, unaccredited businesses with calibration or testing systems can participate if they wish to compare their measurements and measurement systems or procedures.

SPEKTRA organizes round robin tests and can answer your questions!

Call us now or write to us.

SPEKTRA Sales Team

Comparison of measuring devices between your laboratory and SPEKTRA

1. Selection of a suitable SPEKTRA device under test for the comparison measurement
2. Calibration at SPEKTRA and subsequent return to you
3. On-site calibration in your laboratory

4. You send your log data to SPEKTRA
5. Return shipping of device under test
6. Evaluation and transmission of ILC report

Background and standards

The initiatives and process for an interlaboratory comparison are defined in the following standards:

  • DIN EN ISO/IEC 17025 (2018–03): General requirements for the competence of testing and calibration laboratories
  • DIN ISO 13528 (2018-01): Statistical methods for use in proficiency testing by interlaboratory comparison
  • As per DAkkS governing document 71 SD 0 010: “Inclusion of suitability tests in the accreditation”, participation in round robin tests as a suitability test is essential at least once per accreditation period and per measurand

Reference measurement procedure

A reference measurement procedure is a method of analysis of the highest hierarchical level of meteorology. This procedure is the basis on which target values of high correctness and precision can be determined.

Values that are determined using a reference procedure approach the ”true value” as closely as measurement technology permits. To achieve this maximum level of accuracy of the measuring result, special procedures are employed in our laboratory. Even for our own calibration services, we use certified reference standards that are traceable to national meteorological institutes.

This might also be of interest to you:

Link to Calibration of measuring equipment

Sensor characterization

Metrological examination of sensors and other small or large components.

More information

Primary calibration services

Primary calibration with highest level of traceability of sensors and reference devices.

More information

Link to our CS calibration systems

CS calibration systems

All components of a calibration system, developed in-house: exciter, controller and software.

More information

Link to Learning sessions at SPEKTRA

Seminars at SPEKTRA

In-depth, compact and precisely tailored to your industry and goals.

More information