Calibration Overview

Calibration at HBMCalibration with competence

In 1977, the first accredited German Calibration Service (DKD) Labora-tory was based at HBM. Since then, it has become one of the best known and most capable calibration laboratories of its type. Accreditation to ISO 17025 covers the measured quantities force, pressure, torque and voltage ratio mV/V.

DKD – German Calibration ServiceAssociation of calibration laboratories with protected quality Each laboratory is accredited by the German Metrology Institute (PTB) Accreditation guarantees calibration in accordance with mandatory standards and guidelines A calibration certificate is certified proof of traceability

Working standard calibration Calibration at the responsibility of the calibration laboratory carrying out the testingTraceability must be explicitly documented.At HBM this is done by reference to DIN 10012 Under certain conditions, possible on site

Calibration ensures traceability per ISO 9001

To quote from ISO: “…measuring equipment shall be calibrated or verifiedat specified intervals, or prior to use, against measurement standards trace-able to international or national measurement standards.”

Are you certified per ISO 9001?

HBM Calibration LaboratoryYou can rely on our measurement professionals

Duties

Keeping on hand and transfer ofNational Standards as a statutoryduty

Safeguarding the metrological infrastructure in process measurementTest equipment monitoring per ISO 9001

Measurement/testing during quality assurance measuresor production

PTBNationalStandard

DKDReference Standard

Working StandardCalibration

Measuring and Test Equipment

PTB-Label of authenticity

PTBCalibrationCertificate

HBMCalibration Label of authenticity

DKDCalibrationCertificate

WorkingStandard

CalibrationCertificate

DKD-Label of authenticity

Rotating torque transducers are used, for example, in engi-ne and transmission test benches in the automotive indus-try. In many areas, such as research and development orexhaust gas tests, the demands made on accuracy are get-ting ever more stringent. Working standard calibration atthe HBM Calibration Laboratory ensures traceability, oralternatively, traceability can also be proven through on-site calibration, for which DKD-calibrated reference trans-ducers are ideal.

Test bench with T10F torque flange

In industry, force transducers that have been calibrated at an accredited laboratory (e.g. DKD) often serve as an in-house reference. They can be used, for example, to check the transducers in use in production systems, thus ensuring a constant production quality. An important fieldof application is calibration, in conformance with stan-dards, of transducers incorporated in material testingmachines.

Calibration with a Z4A forcereference transducer

Especially when calibrating amplifier systems (e.g. MGCplus), HBM can use its know-how as a manufacturer of such systems. A resulting customer benefit is that reliable ok / not ok evaluation is included.

Examples of Calibrated Measurement Equipment

First DKD-accredited torque calibrationlaboratory (since 1990)

Highest accuracy attained outside nationalmetrology institutes

Calibration of transfer torque wrenchesusing a special calibration procedure

Measured Quantities

Most unique combination of calibrationoptions in the DKD (direct and alternatingvoltages)

Greatest accuracy in the DKD

Decades of know-how from manufacturingcalibration instruments and measuringamplifiers for this measured quantity

Torque

Voltage ratio

Measured Quantities

A 4+3 increasing/decreasing series acc. to DIN 51309, EA10/14 or DKD-R 3-5B 2+1 increasing/decreasing series acc. to VDI 2646C 1+1 increasing/decreasing series

Large range of calibration steps in the DKD (0.1 to 3,600 bar gage pressure)

First measured quantity of the DKD (1977, initially HBM only)

Largest range of calibration steps in the DKD (2.5 N to 5 MN)

Force

Pressure

HBM amplifiersFor example, MGCplus, QuantumXamplifier systems from HBM

Working standard calibrationcertificate with ok/not okevaluation

Other measured quantitiesWorking standard only

DisplacementStrain*Acceleration*Frequency*Electric charge*Voltage*Rotational speed** only HBM-Products

Calibrating a single device or a measurement chainStrictly speaking, calibration only applies to applications for which themeasuring instrument is used in accordance with the calibration condi-tions. So from the point of view of minimizing deviations, so-called cali-bration of the measurement chain is ideal: the transducer is calibratedtogether with the particular amplifier with which it is going to be used in the application. On the other hand, you should choose to calibrate individual devices ifthe transducer and the amplifier are not permanently assigned to oneanother.

Advice from your contact person in the local HBM sales office

In-depth technical clarification in direct contact with our calibration laboratory at the factory in Darmstadt, Germany

Both as a straightforward service for your devices and when you buy your HBM products

Depending on conditions and requirements, also available as an on-site service from HBM Service Engineers

Calibration in a partial load rangeFor certain requirements, it makes sense to restrict calibration to part ofthe possible measuring range, which often improves the accuracy in thispart of the range.

Your Route to a Calibration Certificate

Single deviceWhat are your

calibrationrequirements? Measurement

chain

Classification and measurement uncertaintlyThe measurement uncertainty comprises the individual metrological properties(reproducibility, interpolation error, etc.). A DKD calibration for the measuredquantities of force and torque includes computation of the measurement uncer-tainty using these criteria and, in addition, making a classification in compliancewith the relevant standards

How long is a calibration valid?Basically calibration is only valid at the time it is performed The user is always responsible for specifying calibration intervalsRecommended: approx. one year for electronic devices, and max. two years for transducers

What you can expect from calibrationWhen calibrating a measuring instrument the correlation between the inputquantity and the output quantity is determined under specified conditionsand documented. The input quantity is the physical quantity to be measu-red, e.g. force or pressure. The output quantity is often the electrical orelectronic output signal of the measuring instrument, although it can alsobe a reading.Calibration is often confused with other terms, or lumped together withterms that describe quite different processes:

A test that establishes the extent to which a requirement is met Adjustment during which a measuring instrument is set up or balanced in order to eliminate the known systematic variations for the intended applicationLegal verification that covers quality testing and rating in accordance with the verification specifications. This is prescribed, for example, for test equipment for pricing (shop scales, petrol pumps) or for medical products and is performed by Weights and Measures Boards Balancing the measurement chain, in order to convert the known measurement properties of a transducer (typically obtained from calibration) to the correct settings at the measuring amplifier

Partial loadrange

DKDCalibration

WorkingStandard

Calibration

ClassificationNominal(rated) range

HBM technology worldwide provides reliable, high-accuracy measurement

Force transducers, displacementtransducers

S133

2-7.

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Precision amplifiers,amplifier systems

Torque transducers, pressure transducers

Bridge standards,calibration units

HBM GmbHwww.hbm.com Tel. +49 6151 803-0E-Mail: info@hbm.com Fax+49 6151 803-9100

measure and predict with confidence

Your direct contact to the Calibration Laboratory

Tel. +49 6151 803 436Fax +49 6151 803 590E-Mail: dkdcal@hbm.com