Calibration of measuring equipments

G

Ganesan

#1
In our registrar audit the auditor requirements is to determine the calibration acceptance accuracy by our company.We are sending our instruments for third party involving in calibration and the certificate stated whether the instrument intended to use or no.
It specifies the acceptance error reference to international standard.
Please provide your expertise whether company should have accuracy limits before accepting the calibrated instrument.
The file attached for your comments.
 

Attachments

Elsmar Forum Sponsor

Manoj Mathur

Quite Involved in Discussions
#2
Same question from my side also.

Can any one of you tell me what should be accuracy of calibration? Is it one fifth of tolerence (Just a Thumb Rule what I read from Somewhere/)

Manoj
 
#3
At Least 25%

Ganesan and Manoj,
This is from ANSI/NCSL Z540-1-1994: Section 10.2 b) "..the collective uncertainty of the measurement standards shall not exceed 25% of the acceptable tolerance..."

Meaning: If you have a voltage meter that needs +/- 5% accuracy, then the power supply (your voltage standard) used to calibrate the voltage meter needs to be at least +/- 1.25% accurate. That's where your 1/5 rule of thumb comes in. Good labs will use a +/- 1% standard to calibrate +/- 5% equipment to give themselves some room for error.

I believe that ISO/IEC Guide 25 (I don't have a copy in my file, oops) has superceded the above standard. I sure one of the others here can make sure this hasn't changed.
 
Thread starter Similar threads Forum Replies Date
V Ammeter calibration - Measuring head (on pic.) problem General Measurement Device and Calibration Topics 1
G ISO 9001 and ISO 17025 - Measuring tools not in calibration system General Measurement Device and Calibration Topics 3
S Calibration - Isolated current meter - Measuring patient auxiliary leakage current Calibration and Metrology Software and Hardware 4
Q Acceptable calibration accuracy of a 60" linear measuring device General Measurement Device and Calibration Topics 16
C AS9100D 7.1.5.2 / Calibration of Employee Owned Measuring Equipment AS9100, IAQG, NADCAP and Aerospace related Standards and Requirements 5
J IATF 16949 Cl. 7.1.5.2.1 - Gauges (Measuring Jigs) Calibration/Verification Records IATF 16949 - Automotive Quality Systems Standard 6
A Calibration Interval - AS9100 - Control of Monitoring and Measuring Equipment Calibration Frequency (Interval) 8
S Measuring a "calibration" process of a machine Capability, Accuracy and Stability - Processes, Machines, etc. 3
W Calibration and Measuring Device Labeling Requirements Quality Manager and Management Related Issues 4
WEAVER Calibration of Measuring Instrument by Adjustment of its Scales IATF 16949 - Automotive Quality Systems Standard 2
R ISO 17025 M&TE (Measuring & Test Equipment) Calibration Requirements ISO 17025 related Discussions 4
R Validity of Calibration Stickers on Measuring Tapes and Rulers General Measurement Device and Calibration Topics 26
Z CMM (Coordinate Measuring Machine) Calibration Interval (Frequency) ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 1
P Is it compulsory to send new measuring equipment for calibration / verification? Calibration Frequency (Interval) 3
M Basis used for Calibration or Verification of Measuring Equipment ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 8
R CMM Calibration Frequency - Bendix manual Coordinate Measuring Machine Calibration Frequency (Interval) 5
R 3 Wire Thread Measuring System - Gage Calibration General Measurement Device and Calibration Topics 8
L What are the calibration requirements for a newly purchased measuring device? AS9100, IAQG, NADCAP and Aerospace related Standards and Requirements 9
R Use of Reference standard in Calibration of measuring Tools General Measurement Device and Calibration Topics 1
R Reference Standard for the Calibration of Dimensional Measuring Tools General Measurement Device and Calibration Topics 2
R Self (In-House) Calibration of Measuring Tools (vernier, micrometers etc.) General Measurement Device and Calibration Topics 17
R Self Calibration of Dimensional Measuring Tools General Measurement Device and Calibration Topics 3
G ANSI/NCSL Z540.3 (Requirements for the Calibration of Measuring and Test Equipment) General Measurement Device and Calibration Topics 1
M CMM (coordinate measuring machine) calibration recommendations General Measurement Device and Calibration Topics 15
Ajit Basrur Reduction of calibration frequency for CMM (coordinate measuring machine) General Measurement Device and Calibration Topics 9
H Calibration of Measuring instrument, MRP gauges in machining General Measurement Device and Calibration Topics 2
eternal_atlas Calibration of Inbuilt Measuring Devices General Measurement Device and Calibration Topics 8
H Determining Measurement (Measuring) Device Calibration Frequency Calibration Frequency (Interval) 36
K Calibration Frequency of a CMM Machine (Coordinate Measuring Machine) Calibration Frequency (Interval) 1
B Steel Measuring Tape - Can a Steel Measuring Tape be excluded from calibration? ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 38
A Is Calibration Required for Equipment/Devices Used for Measuring Support Services General Measurement Device and Calibration Topics 6
K Measuring equipment different than scope - Accreditation document for our calibration General Measurement Device and Calibration Topics 2
C Calibration of an Electrical Measuring Device - Multimeter, Voltmeter General Measurement Device and Calibration Topics 17
3 Calibration Frequency - Control of Monitoring and Measuring Devices - Clause 7.6 Calibration Frequency (Interval) 14
D Argument for R&D Measuring Instruments to be included in the Calibration Program ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 40
Antonio Vieira 7.6 Calibration - We can?t find any laboratory to calibrate our measuring equipment ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 10
D Calibration labels - Does all measuring equipment require a label to indicate status? General Measurement Device and Calibration Topics 8
D Are measuring equipment manufacturer calibration certificates (certs) sufficient? QS-9000 - American Automotive Manufacturers Standard 6
A ISO 14001 Calibration Requirements: Do ALL measuring devices need to be calibrated? ISO 14001:2015 Specific Discussions 5
Icy Mountain Reasonable calibration? 50 foot measuring tape and other basic M&TE General Measurement Device and Calibration Topics 25
A Calibration of inspection, measuring and test equipment Inspection, Prints (Drawings), Testing, Sampling and Related Topics 12
R Test & Measuring Equipment - Statistical studies to calibration determine frequency Calibration Frequency (Interval) 3
C Correct Calibration Method for Dial Depth Gage General Measurement Device and Calibration Topics 6
F Nist traceable calibration certificates General Measurement Device and Calibration Topics 1
G Tool tracebility and First calibration requirements for aerospace (AS9100) organisation AS9100, IAQG, NADCAP and Aerospace related Standards and Requirements 5
D Calibration of Digital thermometer with surface probe General Measurement Device and Calibration Topics 1
T Calibration or Verification -> Cm and Cmk, etc. Definitions, Acronyms, Abbreviations and Interpretations Listed Alphabetically 3
Q Quality Technician (calibration / metrology) - Memphis, TN Job Openings, Consulting and Employment Opportunities 1
G Is repeatability required for equipment calibration? General Measurement Device and Calibration Topics 10
was named killer AS 9100D - Calibration Instructions - Controlled documents? AS9100, IAQG, NADCAP and Aerospace related Standards and Requirements 6

Similar threads

Top Bottom