How you can minimize Risk Factors In Calibration of your Instruments
Choose ISO:IEC 17025:2017 Accredited Calibration Lab service partner. Understand measurement uncertainties and the guard banding process which are being used in the Calibration of your Equipment. Understand the Certificate and Data your Calibration Service Provider is giving you.
What information is included in a Calibration Certificate?
- Calibration Lab Information
- Accredited Logo when applicable
- Details about the Unit Under Test (UUT)
- Details and Traceability of the equipment used to perform the Calibration
- The Calibration Method used
- The results including corrections
- The uncertainty of measurement
- The Environmental Conditions which the Calibration was performed
- Notes about the Calibration
What information is included in a Calibration Certificate?
- Calibration Lab Information
- Accredited Logo when applicable
- Details about the Unit Under Test (UUT)
- Details and Traceability of the equipment used to perform the Calibration
- The Calibration Method used
- The results including corrections
- The uncertainty of measurement
- The Environmental Conditions which the Calibration was performed
- Notes about the Calibration
Requirements of a Calibration Certificate
A. Title
B. Name & Address of the laboratory;
C. Location of the laboratory activities
D. Unique identification that all components are recognized as a portion of a complete report & a clear identification of the end;
E. Name & contact information of the customer
F. Identification of the method used;
G. The condition of the item;
H. Date of receipt of the calibration
I. Date performance of the laboratory
J. Date Issue of the report
K. Statement of effect that results relate only to the item calibrated
L. Authorized Signatories
M. Environmental conditions
N. A statement identifying how the measurements are metrologically traceable
O. Standards Used to Calibrate Equipment
P. Accreditation Body Symbol and Lab Certificate Number (if the calibration service is only covered by the scope of accreditation)
Q. ILAC-MRA Symbol (Optional)
Requirements of a Calibration Certificate
A. Title
B. Name & Address of the laboratory;
C. Location of the laboratory activities
D. Unique identification that all components are recognized as a portion of a complete report & a clear identification of the end;
E. Name & contact information of the customer
F. Identification of the method used;
G. The condition of the item;
H. Date of receipt of the calibration
I. Date performance of the laboratory
J. Date Issue of the report
K. Statement of effect that results relate only to the item calibrated
L. Authorized Signatories
M. Environmental conditions
N. A statement identifying how the measurements are metrologically traceable
O. Standards Used to Calibrate Equipment
P. Accreditation Body Symbol and Lab Certificate Number (if the calibration service is only covered by the scope of accreditation)
Q. ILAC-MRA Symbol (Optional)
Certificate Data for ISO:IEC 17025-2017 Accredited Calibration
Requirements
Certificate Data for ISO:IEC 17025-2017 Accredited Calibration
Requirements
Statements of Pass or Fail Conformance
The uncertainty of measurement has been taken into account when determining compliance with specification, as per ILAC-G8:03/2009. All measurements and test results guard banded to ensure the probability of false-success does not exceed 2% in compliance with ANSI/NCSL Z540.3-2006.
The status of compliance with the acceptance criteria is reported as:
PASS – Compliant with specification
FAIL – Not compliant with specification
FAIL(z) – The measured value is not within the acceptance limits. However, a portion of the expanded uncertainty of measurement at 95% is within the specified tolerance.
PASS(z) – The measured value is within acceptance limits. However, a portion of the expanded uncertainty of measurement at 95% exceeds the specified tolerance.
The expanded uncertainty of measurement is stated as the standard uncertainty of measurement multiplied by the coverage factor k=2, which for a normal distribution corresponds to a coverage probability of approximately 95%, unless otherwise stated.
This calibration report complies with ISO:IEC 17025:2017 and ANSI/NCSL Z540.3 method 6-guard bands based on test uncertainty ratio.
Understanding the Scope of Accreditation
ISO:IEC 17025
- Competence of test and calibration laboratories
- Demonstrate requirements
- Able to operate a management system
- Are technically competent
- Able to generate technically valid results
ANSI/NCSL Z540.3
- Technical requirements for calibration of M&TE
- System for control of the accuracy of M&TE
- Calibration System performance requirements
- Calibration laboratory performance requirements
- Link to use of 17025 accredited Cal labs
Understanding the Scope of Accreditation
ISO/IEC 17025
- Competence of test and calibration laboratories
- Demonstrate requirements
- Able to operate a management system
- Are technically competent
- Able to generate technically valid results
ANSI/NCSL Z540.3
- Technical requirements for calibration of M&TE
- System for control of the accuracy of M&TE
- Calibration System performance requirements
- Calibration laboratory performance requirements
- Link to use of 17025 accredited Cal labs
Expanded Uncertainties of Measurement must include all factors that will affect the measurements. Sample factors for an Industrial Scale:
- Uncertainty of the calibration of standards
- Possible Drift since the last calibration
- Resolution of the unit under test
- Correction of Air Buoyancy
- Rounding error no load
- Round error indicated load
- Repeatability
- Environmental factors
Calibration Needs. Simplified.
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