Calibration

MIRA's Calibration Centre has wide experience in the calibration of instruments and transducers used in vehicle research and development. The centre has experienced instrumentation calibration engineers and technicians and a dedicated administration support team. The purpose-designed calibration laboratory offers traceable calibration over a wide range of measurements.

Documented Calibration Procedures Traceable Calibration Certificates Instruments Sealed for Integrity Automatic Recall System Fast Turnaround Time Fixed Price Calibration Certificates viewable from the Internet BS EN ISO 9001:2000 Accreditation

CERTIFICATES - Access your calibration certificates here!

Accelerometry

The transfer functions of vibration sensors are measured by comparing the output of the unit under test with one of two MIRA reference accelerometers. This is performed by attaching the UUT to the reference accelerometer and applying a sinusoidal excitation. Their outputs are then measured simultaneously using an analyser which utilises a single sine correlation technique, this technique measures the output at the fundamental frequency whilst giving good rejection to other frequencies. DC measurements are performed using a high specification digital voltmeter.

Capability

Traceability

The MIRA reference accelerometers are calibrated by comparison with the MIRA transfer standard accelerometer which itself is calibrated by Physikalisch-Technische Bundesanstalt using the European standard for Acceleration based on multiaxis interferometric techniques.

All measuring instruments are calibrated using equipment, which has an unbroken calibration traceability to the National Physical Laboratory, holder of the relevant UK National standards.

Uncertainty

General uncertainty ranges of applied vibration level with 95%CL:

Pressure

The transfer functions of pressure transducers are measured by comparing the output of the unit under test with one of four reference pressure standards. Pressure Gauges are calibrated using a method which is compliant with BS 837-1:1998 For calibrations up to 2MPa air is used as the pressuring medium with a Silicon based fluid being used for higher pressures.

Capability

Gas Pressure Gauges and transducers: 3.5kPa to 2MPaHydraulic Pressure Gauges and transducers: 2MPa to 50MPa

Accreditation

The Calibration Centre at MIRA is a UKAS accredited calibration laboratory No. 0556, for full details of our scope of accreditation, please see our page on the UKAS Web Site.

Traceability

The MIRA reference pressure standards are traceable via an ISO17025 accredited calibration laboratory to recognised International measurement standards.

Uncertainty

See our page on the UKAS Web Site.

Force

The transfer functions of Load Cells are measured by comparing the output of the unit under test with one of three reference load cells or dead weights as appropriate. The calibration of force indicating instruments and weigh pads can also be undertaken.

Capability

Traceability

The MIRA Reference Force standards are traceable via ISO17025 accredited calibration laboratories to recognised International Measurement Standards.

Uncertainty

Machine One : ± 0.246 % ReadingMachine Two : ± 0.65 % ReadingDead-weight Loading : ± 0.1 % Reading

Temperature

Temperature sensors are calibrated by comparing the output of the Unit under test with a reference grade temperature probe and indicator. Controlled variations in temperature are achieved using a digitally controlled temperature bath.

Capability

Calibration Range -25 to +125 deg C.

Traceability

The reference probe and its associated indicator are calibrated by a UKAS accredited laboratory thus providing unbroken traceability to National Standards.

Uncertainty

Reference temperature measurement: +/- 0.02 deg C.Test Sensor Measurement:

Thermocouple Type J,K,E,N,T: +/- 0.21 deg CThermocouple Type S,R,B : +/- 0.46 deg C from 0 to 125 deg C

Thermocouple Type S,R,B : +/- 0.81deg C from -25 to 0 deg C