Calibration Certificate
Calibration certificate is the document declaring the instrument calibration results in the laboratory.
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It shows the machines errors and uncertainties. It has the comparison of measurements between the standard and the instrument.
An instrument, such as a gas detector, with sensors that are read and compared.
Displays instrument errors and uncertainties. The calibration procedure can be carried out by the metrology laboratory.
The certificate also presents the results, in the document, of
uncertainties calculations, averages, degrees of freedom, and differences in instrument measurements.
These values are informed in the tables. The calculations also have the propagation of errors and uncertainties of the standards.
Every machine that has a calibration certificate can have information on the accuracy of the measured values, coming from the sensors.
Measurement uncertainty and error are important for real-time use.
Calibrated instruments can be scales, calipers, manometers, gas detectors, multimeters, arm pressure gauges, sphygmomanometers, etc.
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Gas detector calibration certificate
The certificates usually have references in percentages, and the values read from the machine sensor. The gas detector can measure in ppm.
Weighing scale calibration certificate
Weighing scale certificates may have nominal weight reference values. These weights may have official certificates with nominal numbers in the document.
These values are compared with the weighing scale measurements. Units can be mg, g, kg, ton, etc. In certificates, repeatability and eccentricity are sometimes introduced.
Manometer calibration certificate
Manometer certificates have measurement values when the pressure rises and when it falls. The comparison is performed between the instrument and the reference.
In the
uncertainty calculator, the averaging is calculated to generate uncertainties, fiducial errors, hysteresis, and repeatability from the sensors.
Document
The calibration certificate has a lot of necessary information. Item names are generally according to VIM (International Metrology Vocabulary).
The standards for generating the calibration certificate can be based on ISO/IEC 1725.
The following information can be included in the calibration certificate document: calibration laboratory company, certificate number, calibration date, applicant, instrument identification, environmental conditions, procedure, standards, ranges, calibration results, notes and signatures.
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1 – Calibration laboratory company
The name of the official company must be the laboratory that carried out the calibration. Usually official information with addresses and identifications can be placed.
2 – Calibration certificate number
The official certificate number is displayed. This document number is used as a basis for associating the certificate with the specific machine. The format is defined by each company.
3 – Calibration date
The calibration date represents when the instrument was calibrated. Companies can also set a calibration expiration date. But when the instrument is recalibrated, the certificate number usually has to be specifically changed.
4 – Requester
Requester is the company that requested that the instrument be calibrated. She can use the instrument with uncertainties and errors below the tolerance range, with the maximum permissible error.
5 – Instrument identification
The instrument identification can be any name, type, manufacturer, model, serial number or identification code.
6 - Environmental conditions
Environmental conditions are the temperature, humidity and pressure of the environment in which the equipment was calibrated. They can sometimes interfere with instrument values.
7 – Procedure
It is the official document that represents the calibration method step by step.
8 – Standards
The standards are the identification of the equipment used as a reference. These standards must also have the original certificate number.
Errors and uncertainties are propagated as well.
9 – Tracks
An instrument can have several tracks or units. The ranges or units have specific tables in the document for each case.
For example, multimeter with range in mV unit and another range in V unit.
10 – Calibration results
Calibration results are usually shown in the data table from the sensors.
Reference columns, measured values, mean, error, uncertainty, degrees of freedom, etc. Sometimes the worst error and uncertainty may be presented to be compared with the maximum permissible error.
11 – Notes
Some specific cases may have official information related to the instrument or calibration.
12 – Signature
The official responsible for the calibration can sign the calibration certificate document.
