SBS - The best value in QMS software

Understanding the absolute uncertainty specification for a Fluke 5500A

N

NickF

#1
#1
Hi All,
I have a discussion with a colleague about using the specifications from the Fluke 5500A calibrator. The operating manual can be found online at http://assets.fluke.com/manuals/5500a___omeng1100.pdf, and it shows at page 1.11 about DC Voltage specifications. The description for "Absolute Uncertainty" is "? (% of output + ?V)". If we check the range of 0 to 32.99999 V and for the interval of 1 year, the absolute uncertainty is defined as "0.005% and 50uV".

If I use the calibrator to generate a DC voltage of 10V, what is the absolute accuracy coming from 5500A? My understanding is that it is 0.005%*10V +50uV = 0.55mV.
If I got his point right, he explains that this uncertainty is stated for 33V and therefore the whole thing has to be multiplied by 10/33, therefore the absolute uncertainty he comes up with for 10V is (0.005%*10V+50uV)/3.3 = 0.167mV. We could not discuss it any further, because he got so aggravated by mental blockage and lack of understanding, that we had to stop the conversation :)

Regards,
Nick
 

Attachments

Last edited by a moderator:
Free Trial of DISCUS Desktop
Elsmar Forum Sponsor
D

dgriffith

Quite Involved in Discussions
#3
#3
I will look at it when I get to work (2 hrs.) and respond. What does the spec say about the 0.005%? Reading, full scale? Makes a difference.

DG
 
D

dgriffith

Quite Involved in Discussions
#4
#4
From the manual:
[FONT=Arial,Bold][FONT=Arial,Bold]Absolute Uncertainty Definition
The 5500A specifications include stability, temperature coefficient, linearity, line and
load regulation, and the traceability of the external standards used for calibration.
You do not need to add anything to determine the total specification of the 5500A for​
the temperature range indicated.
[FONT=Arial,Bold][FONT=Arial,Bold]Specification Confidence [/FONT][/FONT][FONT=Arial,Bold][FONT=Arial,Bold]Interval[/FONT][/FONT]
[FONT=Arial,Bold][FONT=Arial,Bold]99 %[/FONT][/FONT]​

[FONT=Arial,Bold][FONT=Arial,Bold][FONT=Arial,Bold][FONT=Arial,Bold]1-16. DC Voltage Specifications[/FONT][/FONT][/FONT][/FONT]​

[FONT=Arial,Bold][FONT=Arial,Bold][FONT=Arial,Bold][FONT=Arial,Bold][FONT=Arial,Bold][FONT=Arial,Bold]Absolute Uncertainty, tcal ? 5 [/FONT][/FONT]?[FONT=Arial,Bold][FONT=Arial,Bold]C? (% of output + u[/FONT][/FONT][FONT=Arial,Bold][FONT=Arial,Bold]V)[/FONT][/FONT]


Range: (0 to 32.99999) V: 90 Day: (0.004 + 50) 1 Year: (0.005 + 50) 24 Hr. Stability: (4 + 30) Resolution: (10) Burden: (10 mA)​


[/FONT]​
[/FONT]​
[/FONT]​
[/FONT]​
[/FONT]​
[/FONT]​
For 10 Vdc, on the 33 Vdc range, within ?5 ?C of the temperature at which it was calibrated, the specification is 0.005% of 10 Vdc plus 50 microvolts (the floor).
So, I have it as 0.00005*10=0.0005 V + 50 uV = 0.00055 Vdc uncertainty at 99% confidence. 99% confidence has a nominal factor of 2.58, 0.00055/2.58 = .000213 V standard uncertainty. This is the value you would use when combining with other standard uncertainties in a budget. Of course, those RSS'd uncertainties would then be multiplied by 2 to get the expanded uncertainty at approximately 95%.
(This is why you can't just start combining quantities--different confidence levels.)​

This is the minimum uncertainty--there may be other quantities you need to consider.​
 
Last edited:
You must log in or register to reply here.
Thread starter Similar threads Forum Replies Date
Q Understanding "free movement" for CE-marked products EU Medical Device Regulations 2
D High level understanding of EUDAMED EU Medical Device Regulations 3
A 60601-1 understanding of stationary device IEC 60601 - Medical Electrical Equipment Safety Standards Series 0
N Help with basic understanding of Competence requirements ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 3
D Surface Roughness understanding Inspection, Prints (Drawings), Testing, Sampling and Related Topics 1
P Understanding DFMEA and PFMEA - Supplier Related IATF 16949 - Automotive Quality Systems Standard 21
DuncanGibbons Understanding the applicability of Design of Experiments to the IQ OQ PQ qualification approach Qualification and Validation (including 21 CFR Part 11) 5
B Measuring and monitoring equipment - Understanding which procedures to be compliant with ISO 13485 ISO 13485:2016 - Medical Device Quality Management Systems 6
M Informational Health Canada has launched an e-Learning tool to aid in understanding the premarket regulatory requirements for medical devices in Canada Medical Device and FDA Regulations and Standards News 0
S Understanding UDI requirements - Class 2 medical device (hearing aids) 21 CFR Part 820 - US FDA Quality System Regulations (QSR) 3
M Informational Understanding Costs And Risks For HFE Usability Studies — Part 1: Testing In-House Medical Device and FDA Regulations and Standards News 0
P Understanding FDA draft "Management of Cybersecurity in Medical Devices" Medical Information Technology, Medical Software and Health Informatics 3
J Properly understanding SPC - Newbie SPC questions Statistical Analysis Tools, Techniques and SPC 34
S Understanding control chart and measurement capability Statistical Analysis Tools, Techniques and SPC 2
P Minitab Data Analysis - Understanding if a Process is in Control or Not Using Minitab Software 2
R Understanding a few points on ISO 9001's Design and Development Planning ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 1
Z Understanding Cycle Time - Why the time of the other activities are left out Lean in Manufacturing and Service Industries 11
J Understanding ISO 9001:2015 - 10.3 Continual Improvement ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 10
J Understanding ISO9001:2015 - 8.3: Design and Development of Products and Services ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 3
E Root Cause Analysis - Is Insufficient Understanding an acceptable Root Cause? General Auditing Discussions 9
E Understanding of TS 16949 Clause 7.6.2 IATF 16949 - Automotive Quality Systems Standard 5
K Understanding IEC 60601-2-68 requirements ISO 13485:2016 - Medical Device Quality Management Systems 1
A Training material for interpretation & understanding Part 11 requirements 21 CFR Part 820 - US FDA Quality System Regulations (QSR) 2
N Understanding, Challenging & Approving Supplier Control Plans FMEA and Control Plans 7
M Definition Recommendations - Understanding "recommendations" and "recommended corrective action" Definitions, Acronyms, Abbreviations and Interpretations Listed Alphabetically 8
S Understanding UDI (Unique Device Identification) Other US Medical Device Regulations 10
T Understanding USP <1112> Water Activity as applicable to Medical Devices Other Medical Device and Orthopedic Related Topics 4
K Understanding Risk Management Requirements according to AS9100 AS9100, IAQG, NADCAP and Aerospace related Standards and Requirements 11
S MIL-HDBK-217 - Understanding the various Environmental Conditions Reliability Analysis - Predictions, Testing and Standards 1
D What is your understanding or interpretation of TS16949 7.4.1.2 IATF 16949 - Automotive Quality Systems Standard 6
C Understanding the relationship between 62304 and the MDD ER IEC 62304 - Medical Device Software Life Cycle Processes 7
S Understanding Subgroup Size - Multi Cavity (Minitab) Statistical Analysis Tools, Techniques and SPC 4
R Understanding clause 15.4.2.1 d) of amendment 1:2012? IEC 60601 - Medical Electrical Equipment Safety Standards Series 7
M Understanding accreditation, MoUs, certifications Other ISO and International Standards and European Regulations 28
L Mobile Medical App - Understanding 21 CFR Part 820 Requirements 21 CFR Part 820 - US FDA Quality System Regulations (QSR) 3
D Understanding and implementing ISO 17025 ISO 17025 related Discussions 9
M Understanding Versions of Collateral and Particular Standards IEC 60601 - Medical Electrical Equipment Safety Standards Series 7
S Understanding, Analysis and Monitoring Quality Defects on Composite Components Statistical Analysis Tools, Techniques and SPC 3
S Understanding PMS (Post Market Surveillance) and PMCF (Vigilance and PMCF) Quality Manager and Management Related Issues 1
B Understanding why my CpK and PpK are low, and LCL Statistical Analysis Tools, Techniques and SPC 20
S Understanding Quality Objectives, Metrics and KPI ISO 13485:2016 - Medical Device Quality Management Systems 15
Q Beginner's Understanding - The Purpose and Applications of QMS/ISO Standards Philosophy, Gurus, Innovation and Evolution 12
Q Understanding Configuration Management AS9100, IAQG, NADCAP and Aerospace related Standards and Requirements 16
W Understanding PPAP Appearance Approval APQP and PPAP 22
V Understanding Automotive Coating for Seating Mechanism Components Manufacturing and Related Processes 1
M Understanding of Regression and ANOVA in Minitab Statistical Analysis Tools, Techniques and SPC 8
4 Understanding ILAC policy P14:12/2010 6.3 part a) General Measurement Device and Calibration Topics 28
H Understanding 8.2.3 M&M of Processes for our Internal Audit ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 6
P Understanding ISO 26262 Road Vehicle Functional Safety Other ISO and International Standards and European Regulations 2
A Understanding adoption of a product to an existing Sterilization Cycle Other US Medical Device Regulations 1

Similar threads

Top Bottom