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Z540.3 Compliance, and thegeneral topic of Accreditation,
Whats an accredited cal?
Bob Stern (707) 577-2886SSU - AmericasAgilent NCSLI member delegateVoting member, 174 Stds Writing CommitteeMember, 171 Z540.3 Handbook CommitteeMember, Agilent Cal Cert Working Group (CCWG)
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NCSLI TutorialNCSLI TutorialImplementing ANSI/NCSL Z540.3Implementing ANSI/NCSL Z540.3NCSLI TutorialNCSLI TutorialImplementing ANSI/NCSL Z540.3Implementing ANSI/NCSL Z540.3
July 2009 @ NCSLI
Mark your calendar for the Wed 24 Mar 2010 tutorial atMeasurement Science Conference in Pasadena
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New Z540.3 Web Portal
http://www.agilent.com/find/Z540.3
,
, ,
articles, etc.List of models with Z540.3 calibration compliance from Agilent Technologies
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Did you Know?
Guidelines on Assessment and Reporting of Compliance with Specification ILAC-G8:1996
Document can be downloaded free: http://www.ilac.org/
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ILAC-G8 Conformance
Upper acceptance limit
Upper specified tolerance
??
??
??
Fail
Nominal
Lower specified tolerance
Pass
Pass
95% expanded uncertainty
Guidelines on Assessment and Reporting of Compliance with Specification ILAC-G8:1996Document can be downloaded free: http://www.ilac.org/
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ILAC-G8
ILAC G8, Appendix A, page 10, drives Euro-ABs (like UKAS)to require Guard bands for K=2 (95% confidence interval)
Source: Guidelines on Assessment and Reporting of Compliance with Specification ILAC-G8:1996
Pass #,Indeterminate
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Z540.3 Handbook Compliance Method #5
Upper acceptance limit
Upper specified tolerance95 % expanded
uncertainty guard
band
Pass
Fail
Fail
Fail
Fail
Fail
Adjust if overAcceptance limit
Nominal
Lower acceptance limit
Lower specified tolerance
Pass
95% expanded uncertainty
95 % expandeduncertainty guard
band
Guidelines on Assessment and Reporting of Compliance with Specification ILAC-G8:1996Document can be downloaded free: http://www.ilac.org/
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Pragmatic Method for Pass/Fail Conformance
Reporting
Upper acceptance limit
Upper specified tolerance95 % expanded
uncertainty guard
band
Fail1
Fail1Fail1
Fail
95% expanded uncertainty
Adjust if overAcceptance limit
Nominal
Lower acceptance limit
Lower specified tolerance
Pass
Fail1Measured value
95 % expanded
uncertainty guard
band
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NCSLI Measure Magazine, March issue
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Z540.3 Requirements for outside
calibration suppliers
Source: Z540.3, paragraph 5.5 Outside Suppliers
Accreditation?
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A2LA now accredits to Z540.3
Source: http://www.a2la.org/documents/searchdocuments.cfm
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Excerpt: A2LA C207 audit checklist for Z540.3
Source: http://www.a2la.org/documents/searchdocuments.cfm
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Confused about Accreditation??
1. What exactly is accreditation?
2. How can I use it to compare Calibration Lab A to Lab B?
. a o ge or er an ccre e a
4. How is an accredited cal different (or better) from a standard calibration?
5. Is Accredited cal better than ISO 17025?
6. Can I expect to see Z540.3 accredited calibration service?
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How to compare cal lab quality check for
Accreditation, right?
ABC XYZ
Source : http://www.a2la.org/dirsearchnew/newsearch.cfm
A2LA Cert No. 2546.01A2LA Cert No. 1395.05
Is this all you need to know?
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Scope of Accreditation
1. The calibration lab tells the A2LA auditor which parameters it seeksaccreditation.
2. For each requested parameter the A2LA auditor then:i. Spends time with the technicians assessing their competency/measurement technique
to measure this particular parameter.
ii. Audit the measurement uncertainty documentation.
How it works:
. u t tracea ty pat to a suc as or
All Americas calibrations are performed by a lab withthe scope-of-accreditation for the relevant parameters.In rare cases, instruments are transhipped to Roseville, CA if needed.
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Authorized Use of A2LA Symbol general guidance
Source: P101 Reference to A2LA Accredited Status A2LA Advertising Policy
A2LA can only act when their symbolappears on a calibration certificate
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Allowed Use of A2LA Symbol on Cal Certificates
Next year
943 models
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Coming Soon What is the benefit to youIf your supplier includes theirAccreditation body symbol onthe Cal cert for your instrument?
. . . it means they welcome close auditorscrutiny of that particular procedure.
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Scope of Accreditation The Backbone
Parameter/Equipment Range Best Uncertainty () Comments
DC Voltage Generate Up to 0.22 V 7.5 V/V + 0.4 V Fluke 5720A/5725A
Up to 2.2 V 5 V/V + 0.7 V
Up to 11 V 3.5 V/V + 2.5 V
Up to 22 V 3.5 V/V + 4 V
Up to 220 V 5 V/V + 40 V
Up to 1100 V 6.5 V/V + 400 V
AC Current Measure
Group/Presentation TitleAgilent Restricted
Month ##, 200X
Resistance Measure
Capacitance GenerateRF Absolute Power Measure
Attenuation Generate
Digital Modulation Measure
Etc, Etc, Etc
The scope of accreditation is a listing of all of the parameters that a lab is capable
of making accredited measurements in. The lab decides which parameters itwants to represent, but the accrediting body assesses the capability.
The customers focus: What are youcapable of measuring, in what ranges,and how accurate are you?
Source : Scott Arrants
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Your measurement uncertainty may vary . . .
The fine print at the end of any lab accreditation certificate . . .
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Z540.3 Compliance its boththe Scope andthe individual procedure
3458A
Meas. Uncertainty
Part of BMC
User 5 digit DMMto be calibrated
Josephson Junction atAgilents Loveland Primary Stds. Lab
ABC voltmetercal system
1. Meas. Uncertainty ofABC system?
2. Compliance methodfor 5 digit DMM calprocedure??
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Accreditation Evaluation Summary Points
1. Look past the front page!
2. Make sure the scope covers all the parameters of your instrument.
3. Make sure the calibration measurement capability (aka. best uncertainty)can measure your instrument.
4. Check what lab standards are used for our instrument in the trace info
on a sample cal certificate.5. Z540.3 Accreditation ask for it A2LA is open for business
6. Look for the accreditation symbol on the Cal certificate.