IEC 61676 pdf downlaod – Medical electrical equipment – Dosimetric instruments used for non-invasive measurement of X-ray tube voltage in diagnostic radiology

IEC 61676 pdf downlaod – Medical electrical equipment – Dosimetric instruments used for non-invasive measurement of X-ray tube voltage in diagnostic radiology
1 Scope and object
This International Standard specifies the performance requirements of instruments as used inthe NON-INVASIVE MEASUREMENT of X-RAY TUBE VOLTAGE up to 150 kV and the relevantcompliance tests.This standard also describes the method for calibration and gives guidancefor estimating the uncertainty in measurements performed under conditions different fromthose during calibration.
Applications for such measurement are found in diagnostic RADIOLOGY includingmammography,coMPUTED TOMOGRAPHY (CT), dental radiology and RADIOSCoPY.This standardis not concerned with the safety aspect of such instruments.The requirements for electricalsafety applying to them are contained in lEC 61010-1.
2Normative references
The following referenced documents are indispensable for the application of this document.For dated references, only the edition cited applies. For undated references, the latest editionof the referenced document (including any amendments) applies.
IEC60417(all parts),Graphical symbols for use on equipmentIEC 60788:1984,Medical radiology – Terminology
IEC 61000-4-2:1995,Electromagnetic compatibility (EMC) – Part 4:Testing and measurementtechniques – Section 2: Electrostatic discharge immunity test.Basic EMC Publication
IEC 61000-4-3:2000，Electromagnetic compatibility (EMC) – Part 4-3: Testing and measure-ment techniques – Radiated, radio-frequency, electromagnetic field immunity test.Basic EMCPublication
IEC 61000-4-4:1995,Electromagnetic compatibility (EMC) – Part 4:Testing and measurementtechniques – Section 4: Electrical fast transient/burst immunity test.BasicEMC Publication
IEC 61000-4-5:1995,Electromagnetic compatibility(EMC) – Part 4: Testing and measurementtechniques – Section 5: Surge immunity test.Basic EMC Publication
IEC 61000-4-6:1996,Electromagnetic compatibility (EMC) – Part 4: Testing and measurementtechniques – Section 6: lmmunity to conducted disturbances，induced by radio frequencyfields. Basic EMC Publication
IEC 61000-4-11:1994,Electromagnetic compatibility(EMC) – Part 4: Testing and measure-ment techniques – Section 11: Voltage dips,short interruptions and voltage variationsimmunity tests.Basic EMC Publication
IEC 61010-1:2001，Safety requirements for electrical equipment for measurement,control,and laboratory use – Part 1:General Requirements
IEC 61187:1993,Electrical and electronic measuring equipment – Documentation
ISO:1993,International vocabularyof basic andgeneralterms inmetrology(ISBN 92-67-01075-1)
so 7000:1989,Graphical symbols for use on equipment – Index and synopsis
3Terminology and definitions
For the purposes of this standard the following definitions apply.
The definitions given in this standard are generally in agreement with those in IEC 60788 andthe lSO International vocabulary of basic and general terms in metrology.Any terms notdefined in this subclause have the meanings defined in the above publications or areassumed to be in general scientific usage.
3.1
cORRECTION FACTOR
dimensionless multiplier which corrects the lNDICATED VALUE of an instrument from its valuewhen operated under particular conditions to its value when operated under stated REFERENCEcONDITIONS
3.2
EFFECTIVE RANGE
range of lNDICATED VALUEs for which an instrument complies with a stated performance.Themaximum (minimum) effective INDICATED VALUE is the highest (lowest) in this range
3.3
INDICATED VALUE
the value of quantity derived from the scale reading of an instrument together with any scalefactors indicated on the control panel of the instrument
3.4
INFLUENCE QuANTITY
any external quantity that may affect the performance of an instrument (e.g. ambienttemperature etc.) and any property of the X-RAY EQUIPMENT under test that needs to be takeninto account in using the instrument for NON-INVASIVE MEASUREMENT of X-RAY TUBE VOLTAGE(e.g. range of X-RAY TUBE vOLTAGE,ANODE ANGLE, anode material,TOTAL FILTRATION etc.)
3.5
INSTRuMENT PARAMETER
any internal property of an instrument that may affect the performance of the instrument
3.6
INTRINSIG ERROR
deviation of the MEASURED VALUE (i.e. the lNDICATED VALUE, corrected to REFERENCECONDITIONS) from the cONVENTIONAL TRUEVALUE under STANDARD TEST CONDITIONS
3.7
INVASIVE MEASUREMENT
measurement of the x-RAY TUBE VOLTAGE by external connection of a suitable meter or a highresistance divider