bob-stern roseville ncsli 1410

7/31/2019 Bob-Stern Roseville NCSLI 1410

1/23

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)


2/23

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


3/23

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


4/23

Did you Know?

Guidelines on Assessment and Reporting of Compliance with Specification ILAC-G8:1996

Document can be downloaded free: http://www.ilac.org/


5/23

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/


6/23

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


7/23

Z540.3 Handbook Compliance Method #5


Upper specified tolerance95 % expanded

uncertainty guard

band

Pass

Fail

Fail

Fail

Fail

Fail

Adjust if overAcceptance limit

Nominal

Lower acceptance limit


Pass


95 % expandeduncertainty guard

band

Guidelines on Assessment and Reporting of Compliance with Specification ILAC-G8:1996Document can be downloaded free: http://www.ilac.org/


8/23

Pragmatic Method for Pass/Fail Conformance

Reporting


Upper specified tolerance95 % expanded

uncertainty guard

band

Fail1

Fail1Fail1

Fail


Adjust if overAcceptance limit

Nominal

Lower acceptance limit


Pass

Fail1Measured value

95 % expanded

uncertainty guard

band


9/23

NCSLI Measure Magazine, March issue


10/23

Z540.3 Requirements for outside

calibration suppliers

Source: Z540.3, paragraph 5.5 Outside Suppliers

Accreditation?


11/23

A2LA now accredits to Z540.3

Source: http://www.a2la.org/documents/searchdocuments.cfm


12/23

Excerpt: A2LA C207 audit checklist for Z540.3

Source: http://www.a2la.org/documents/searchdocuments.cfm


13/23

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?


14/23

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?


15/23

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.


16/23


17/23

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


18/23

Allowed Use of A2LA Symbol on Cal Certificates

Next year

943 models


19/23

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.


20/23

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


21/23

Your measurement uncertainty may vary . . .

The fine print at the end of any lab accreditation certificate . . .


22/23

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??


23/23

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.

bob-stern roseville ncsli 1410

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