The difference between Accuracy and Uncertainty

C

crazedcalgal

#1
I'm having an issue figuring out the difference between accuracy and uncertainty. I'm looking at calibrating pressure gauge and modules. My gauges all list in their specs accuracy, where my modules list uncertainty. I do I mesh the two... how do I calibrate one using the other...!? HELP!!!
:eek:
 
Elsmar Forum Sponsor

BradM

Staff member
Admin
#3
Here is another thread to view:

http://elsmar.com/Forums/showthread.php?t=26080

There is a post in that thread with a document from Transcat covering the subject. That may be helpful.

In short, I feel that uncertainty is superior to accuracy, in that the uncertainty takes into account all potential contributions to error.

Just make sure your standard has sufficiently low uncertainty to estimate the required accuracy of the gauges.
 
C

crazedcalgal

#4
[FONT=&quot]The XP2i-15 has an accuracy of +-0.003 psi below 3 psi. Accuracy at Full Scale is +/- 0.25% The Fluke 700P22 I want to use with it has a Reference Uncertainty of 0.100. I understand the differences of the terms but how do I make them work together. Is the Crystal accurate enough to be used in the calibration of the 700P22?
[/FONT]
 
C

crazedcalgal

#5
I’ve attached a chart from Fluke. At least I think I have. :confused:We have tons of these pressure modules and almost as many Crystal gauges. We want to state doing in house calibrations of the modules. I have Navy training in Metrology, mostly in the electronics side of the house. I’ve done pressure and dimensions stuff too over the years, but never this kind of low pressure. I’m having a bit of an issue with the accuracy versus the uncertainty and then throw in the resolution. So , straight up… I need help. Can you ask the guys who do your calibration what they think? I’ve been all over asking this question and I’m not getting anywhere. I know what the differences are and how you derive at getting the numbers just not how to determine if the Crystal is good enough to be used in the calibration of the low pressure Fluke modules.

Can you help a girl out?:eek:
 

Attachments

Hershal

Metrologist-Auditor
Staff member
Super Moderator
#6
I'm having an issue figuring out the difference between accuracy and uncertainty. I'm looking at calibrating pressure gauge and modules. My gauges all list in their specs accuracy, where my modules list uncertainty. I do I mesh the two... how do I calibrate one using the other...!? HELP!!!
:eek:
Simple with respect to uncertainty: Uncertainty is the error associated with a given measurement.

Accuracy: not the same.
 
Thread starter Similar threads Forum Replies Date
F What is the difference between Bias and Accuracy in MSA? Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 1
W What is the difference between TYPE B and TYPE BF? IEC 60601 - Medical Electrical Equipment Safety Standards Series 2
T The difference between ISO 14644-3:2005 and ISO 14644:2019 Other Medical Device Related Standards 2
Q Terminal Lugs sizes - Difference between 225/24 vs. 275/24 lugs Manufacturing and Related Processes 2
M Difference between "Production Trial Run" and "Run at Rate" IATF 16949 - Automotive Quality Systems Standard 8
D Difference between Test Method Validation and Gage R&R Qualification and Validation (including 21 CFR Part 11) 18
A What is the difference between Design Process, Process Design and Design Control? 21 CFR Part 820 - US FDA Quality System Regulations (QSR) 2
R What's the major difference between Green Belt and Black Belt in term of training and project Six Sigma 3
T Difference between a subcontractor and a supplier ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 21
H Difference between Stainless Steel 316 ASTM F899 and ASTM A276 Other Medical Device Related Standards 3
A Exact terms for a plating failure and difference between rejection rate and failure rate Manufacturing and Related Processes 9
M Difference between MSA and MSE? General Measurement Device and Calibration Topics 1
gramps What is the difference between discrete and continuous variables? Problem Solving, Root Cause Fault and Failure Analysis 3
JoCam Difference between Approval and Registration - ISO 13485:2016 ISO 13485:2016 - Medical Device Quality Management Systems 2
S Difference between EU-MDR Annex IX and the Annex-combo X&XI EU Medical Device Regulations 4
T ISO 17025:2017 Clause 4.2.2 - The difference between "be notified" and "be informed" ISO 17025 related Discussions 4
Jimmy123 What is the difference between Error Proofing and Controls? ISO/IATF 16949 - Control Plans FMEA and Control Plans 16
C IEC 60601-1-8, difference between table 4 and annex D IEC 60601 - Medical Electrical Equipment Safety Standards Series 2
A What is the difference between Basic UDI-DI and UDI-DI? EU Medical Device Regulations 6
Q What is the difference between AS9100D 9.3.2.f and 9.3.3.a AS9100, IAQG, NADCAP and Aerospace related Standards and Requirements 8
M Aluminum - What is the difference between 6061-T6 and 6061-T651 (both per ASTM B211)? Manufacturing and Related Processes 4
P What is the exact difference between Risk and Opportunity in context of ISO 27001? IEC 27001 - Information Security Management Systems (ISMS) 7
S Difference between Surface Finish (Ra) and Flatness (GD&T) Inspection, Prints (Drawings), Testing, Sampling and Related Topics 6
O Air Flow - Which is the operational difference between LAF (vertical and horizontal) and RLAF? Manufacturing and Related Processes 2
S What the difference is between Stub Acme & Acme thread? Oil and Gas Industry Standards and Regulations 1
S DO 178B - What is the difference between review and verification? Federal Aviation Administration (FAA) Standards and Requirements 1
T The difference between SOP and Kaizen Standardization Lean in Manufacturing and Service Industries 2
K Difference between intended purpose and intended use of the device EU Medical Device Regulations 9
Q What is the difference between normal and licensed internal auditor? VDA Standards - Germany's Automotive Standards 9
J What is the difference between Process Variation and Tolerance? Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 4
O Difference Between PFMEA & Control Plan FMEA and Control Plans 3
S Difference between an Advisory Notice (ISO 13485) and a Field Safety Notice? ISO 13485:2016 - Medical Device Quality Management Systems 3
T Difference between "data analysis" and "management review" ISO 13485:2016 - Medical Device Quality Management Systems 4
qualprod What is the difference between 7.4.1 (2008) and 8.4.1 (2015)? ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 6
D Difference between uncertainty and expanded uncertainty of measurement General Measurement Device and Calibration Topics 1
S EASA Part 145 - The difference between non-certifying staff and Certifying staff Federal Aviation Administration (FAA) Standards and Requirements 2
S The difference between a Medical Device Accessory and Component Canada Medical Device Regulations 2
S What is the difference between a service request and a complaint? ISO 13485:2016 - Medical Device Quality Management Systems 2
I What is the difference between OOS/OOT Imported Legacy Blogs 3
A Definition Difference between Quality System Procedure and Standard Operating Procedure (SOP) Definitions, Acronyms, Abbreviations and Interpretations Listed Alphabetically 4
Q Difference between Monitor & Measurement ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 4
T QA vs. RA - The difference between QA and RA Coffee Break and Water Cooler Discussions 6
A Difference between Discrimination and Least Count IATF 16949 - Automotive Quality Systems Standard 2
K Difference between Medical Electrical Equipment and Medical Equipment System IEC 60601 - Medical Electrical Equipment Safety Standards Series 3
M Usability Standard - The difference between IEC 60601-1-6 to IEC 62336 Human Factors and Ergonomics in Engineering 1
S What is the difference between Verification and Validation of Test Reports? AS9100, IAQG, NADCAP and Aerospace related Standards and Requirements 5
A Difference between ISO 9001:2015 Clauses 8.1 and 8.5.1 ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 8
M IATF 16949 Cl. 8.4.2.2 vs 8.6.5 - Is there any difference between these clauses? IATF 16949 - Automotive Quality Systems Standard 7
C What is the difference between "Overall Risk" and "Risk"? (ISO 14971) ISO 14971 - Medical Device Risk Management 10
C The difference between a Critical Dimension vs. Critical Characteristic Misc. Quality Assurance and Business Systems Related Topics 2

Similar threads

Top Bottom