The calibration certificate contains the information about an
instrument calibration. Calibration is the comparison between a
standard and a tested instrument.
The words, in this format, were chosen based on VIM
(Vocabulaire International de Métrologie) and ISO/IEC
17025:2005.
The purpose of this format is:
1 - To exchange the calibration certificate data between different systems with simple and enough information for the inheritance of errors/uncertainty and traceability.
2 - Import standard values into a calibration management software to be used in the calibration calculus in the inheritance of errors and uncertainties.
3 - Use of data in SCADA systems to take into account the error and uncertainty in comparison with the tolerance limits of the process.
Example: http://www.lcds.com.br/xml/example.xml
<calibrations> - List of calibrations
<calibration> - Calibration certificate.
<id> - Calibrated instrument identification (tag, code, object). Example: MUL001
<name> - Name of the instrument. Example: Multimeter
<number> - Calibration certificate unique number. Example: 00001/2017
<issuer> - Calibration certificate issuer name. (ex: company that issued the calibration certificate of this instrument).
<user> - User name of the person who typed the calibration information.
<responsible> - Calibration responsible name
<calibrationdate> - Calibration date.
<model> - Optional instrument model.
<serialnumber> - Optional instrument serial number.
<validuntil> - Optional date of calibration certificate expiration
<ranges> - List of the calibrated instrument ranges
<range> - Range element
<name> - Range name. Example: ELECTRICAL VOLTAGE - VDC
<rangefrom> - Value of the calibrated instrument minimum range. Example: 0
<rangeto> - Value of the calibrated instrument maximum range. Example: 300
<unit> - Calibrated instrument unit. Example: V
<resolution> - Instrument resolution. Example: 0.01
<referencetype> - Optional type of the reference. Can be STANDARD, or NOMINAL. STANDARD is when the value of the reference is read from the standard instrument. NOMINAL is used, for example, when the reference value is from a block or weight standard with a nominal value. Default is STANDARD.
<measurements> - List of measurements
<measurement> - Single measurement of the calibration
<reference> - Reference value. Example: <reference>1</reference>. If reference has multiples values then optionally insert multiple tags. Example <reference>0.9</reference><reference>1.1</reference><reference>0.9</reference>
<value> - Value read from the calibrated instrument. Can be several values for each measurement line. Examble: <value>1.01</value> <value>1</value> <value>1.01</value>
<reference> or <value> can be omitted if <bias> is avaiable.
<bias> - Estimate of the systematic measurement error. In general the tested (calibrated) instrument <value> minus the standard <reference> instrument value. If the reference is NOMINAL then it is the standard instrument value minus the nominal value. This tag can be omitted if <reference> and <value> tag are available.
<uncertainty> - 95% uncertainty result of this measurement bias average combined with all uncertainty sources.
<veff> - Degrees of freedom of the uncertainty. If empty, then it is infinite (k=2).
<randomerror> - Optional estimate of the random measurement error
<standard> - Optional specific standard instrument id associated with the measurement, if applicable.
<identification> - Optional identification text. Used, for example, to differentiate same weight blocks.
<totalerror> - Optional estimate of the maximum total error upper limit of the measurement result. (Ex. including systematic error, random error, and uncertainty).
<resume>- Optional resume
<totalerror> - Optional Estimate of the maximum total error upper limit of the calibrated instrument. (Ex. including systematic error, random error and uncertainty).
<uncertainty> - Optional maximum uncertainty of the calibration certificate.
<veff> - Optional degrees of freedom of the uncertainty. If empty, then it is infinite (k=2).
<sources> - List of Type B uncertainty sources or standard instruments elements
<source> - Type B uncertainty source or standard instrument element
<id> - Source or standard instrument id <name> - source of uncertainty or standard instrument name
<issuer> - Standard instrument calibration certificate issuer (ex: company that issued the calibration certificate of this standard instrument).
<number> - Standard instrument calibration certificate number.
<calibrationdate> - Standard instrument calibration date.
<rangefrom> - Optional standard instrument main range minimum limit.
<rangeto> - Optional standard instrument main range maximum limit.
<unit> - Optional standard instrument main unit.
<validuntil> - Optional calibration certificate expiration date.
<totalerror> - Optional estimate of the maximum total error upper limit of the calibrated instrument. (Ex. including systematic error, random error and uncertainty).
<uncertainty> - Optional maximum uncertainty of the standard instrument calibration values or Type B uncertainty source value.
<veff> - Optional degrees of freedom of the maximum uncertainty of the standard instrument calibration values. If empty, then it is infinite (k=2).
<distribution> - Optional type of the uncertainty distribution. N> - normal. R> - rectangular. T> - triangular.
Example: