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Suitability of Instruments Presented by Better by Your Every Measure 800.828.1470 www.transcat.com especially for Nashville July 2013.

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Presentation on theme: "Suitability of Instruments Presented by Better by Your Every Measure 800.828.1470 www.transcat.com especially for Nashville July 2013."— Presentation transcript:

1 Suitability of Instruments Presented by Better by Your Every Measure especially for Nashville July 2013

2 Perhaps an attorney evaluating a case to see if it’s feasible to accept... or maybe this no, neither of these is the definition I’m looking for... What is “Suitability”?

3 “Each manufacturer shall ensure that all inspection, measuring, and test equipment, including mechanical, automated, or electronic inspection and test equipment, is suitable for its intended purposes and is capable of producing valid results.”(21 CFR ).... while this is the right context of suitability, it still remains undefined. What is Suitability?

4 Suitable for intended purpose Let’s start out with a simple example... a)What is the most suitable tool for the job? b)Which have you never used to drive a nail?

5 Suitable for intended purpose Really – you’d use a hammer on a screw?? Suitability means using the right tool for the job … … and using it the right way! Who said the Hammer is the right tool for this job?

6 1.Understand components of Suitability for instruments 2.Formulate your own definition of Suitability 3.Compare to your organization’s current definition Create definition for your organization if one doesn’t exist Enhance definition for your organization if one already exists Learning Objectives

7 Reasons People Use the Wrong Tool 1.Inconvenient; don’t want to go get the right tool 2.Don’t know how to use the right tool/instrument 3.Don’t own the right tool/instrument 4.Can’t afford the right tool/instrument

8 Simple vs. Complex Process These are simple hand tool examples If it’s this easy for people to use the wrong tool (or the right tool the wrong way) in a simple process...

9 Simple vs. Complex Process... what are the chances of introducing errors when using more complex tools/instruments in more complex processes?

10 Measurement Quality Assurance Metrological Traceability is important, but... It means nothing if the industrial processes don’t maintain a good measurement quality assurance program MQA is critical to industrial manufacturing processes: – To keep product costs at a minimum – To maintain safety for employees and product consumers – To keep product lead times from being delayed – To make the traceability chain a worthwhile effort (and its costs)

11 Where does Risk Creep into Your Process? Measurement Quality Assurance encompasses a number of assumptions within a manufacturing process: 1. Product AcceptanceYou made the right decision about the acceptance or rejection of your product (or a component of your product) during the manufacturing and quality acceptance process. 2. Basis of DecisionThe decision was based (partially or completely) on quantitative information provided by one or more measuring instruments. 3. Suitability for Intended Purpose You made the right choice in selecting instrument(s) that are appropriate for the measurements in your process. 4. Instrument ApplicationThe instrument(s) were used correctly in the manufacturing process when making decisions about product quality.

12 Where does Risk Creep into Your Process? Measurement Assurance encompasses a number of assumptions (con’t): 5. Beginning of Period Reliability The calibration of the instrument prior to your decision about the product indicated it met its performance expectations. 6. End of Period Reliability The subsequent calibration of the instrument following your decision about the product indicates that it continues to meet its performance expectations. 7. Calibration Process Calibrations are executed correctly and support the application(s). 8. Non-Conformance Review (NCR) If a calibration indicates that the instrument failed to meet its performance expectations, your quality system reviewed any impact to the decision(s) made about your product(s) that were based on the quantitative values presented by the instrument. 9. NCR AccuracyThis impact study was thorough, followed an unbiased, forensic approach, and did not miss the mark on determining any detrimental affect on product. 10. Risk mitigationAny negative result from the impact study was properly mitigated to remove or reduce product risk.

13 Example: Module transfer process between a space vehicle and the International Space Station (ISS). Heaters prevent ice buildup in the transfer module and spacesuits (Space Suit UP!), specifically in the gloves and helmet camera. The main battery pack provides 12.5 ±1.5 VDC – Helmet camera heater requires 12 ± 1 VDC – Glove heaters provide a resistance of 57.7 ± 2.9 Ω; require 9 ± 0.5 VDC Note: No matter how simple the process, following a consistent procedure will keep you from making ‘honest mistakes’ that end up wasting time/money or that cause safety issues. Step 1: Determine all measurements that will be made in this process VDC: 12.5, 12, 9 Resistance (Ω): 57.7 Suitability of Instruments

14 Example: Module transfer process between a space vehicle and the International Space Station (ISS). Measuring heater voltage and resistance. Step 2: Determine initial list of instruments for consideration Centech Handheld DMM Fluke 87V Handheld DMM Agilent 34401A Benchtop DMM Agilent 3458A Opt Digit Multimeter Suitability of Instruments

15 Example: Module transfer process between a space vehicle and the International Space Station (ISS). Measuring heater voltage and resistance. Step 3: Collect the OEM specifications for all instruments Centech Suitability of Instruments

16 Example: Module transfer process between a space vehicle and the International Space Station (ISS). Measuring heater voltage and resistance. Step 3: Collect the OEM specifications for all instruments Fluke 87V Suitability of Instruments

17 Example: Module transfer process between a space vehicle and the International Space Station (ISS). Measuring heater voltage and resistance. Step 3: Collect the OEM specifications for all instruments Agilent 34401A Suitability of Instruments

18 Example: Module transfer process between a space vehicle and the International Space Station (ISS). Measuring heater voltage and resistance. Step 3: Collect the OEM specifications for all instruments Agilent 3458A Opt 002 Suitability of Instruments

19 Example: Module transfer process between a space vehicle and the International Space Station (ISS). Measuring heater voltage and resistance. Step 4: Evaluate instruments for Suitability a)Parameter Verification: Determine if the selected instruments cover the parameters of interest In this case, all four instruments can measure both parameters: DC Voltage and DC Resistance Suitability of Instruments

20 Example: Module transfer process between a space vehicle and the International Space Station (ISS). Measuring heater voltage and resistance. Step 4: Evaluate instruments for Suitability b)Range Verification: Determine if the selected instruments have ranges that cover the target measurements – DC Voltage: 9V, 12V, 12.5 V Centech 37772: The 20V range covers all of the target measurements Fluke 87V: The 60V range covers all of the target measurements Agilent 34401A: The 10V range covers the 9V measurement; 100V range covers other voltages Agilent 3458A: The 10V range covers the 9V measurement; 100V range covers other voltages – Resistance: 57.7 Ω Agilent 3458A: The second lowest range covers the resistance measurement All other models: The lowest range covers the resistance measurement Suitability of Instruments

21 Example: Module transfer process between a space vehicle and the International Space Station (ISS). Measuring heater voltage and resistance. Step 4: Evaluate instruments for Suitability c)Accuracy/Resolution Verification: Using the accuracy statement of each instrument, convert to a tolerance in the engineering unit of the measurand. Centech 37772: Measure 12.5 VDC on the 20V range Accuracy (20V range): ±(0.5% of rdg + 1 digit); resolution is 10mV on this range Tolerance = ±(0.5% x 12.5V + 10 mV) = ± V = ±0.07 V (considering resolution) Suitability of Instruments

22 Example: Module transfer process between a space vehicle and the International Space Station (ISS). Measuring heater voltage and resistance. Step 4: Evaluate instruments for Suitability c)Accuracy/Resolution Verification: Repeat for all other measurements and instruments. Suitability of Instruments

23 Example: Module transfer process between a space vehicle and the International Space Station (ISS). Measuring heater voltage and resistance. Step 4: Evaluate instruments for Suitability d)Process Accuracy Ratio (PAR) Calculation: Use the following formula to calculate PAR for each measurement and each instrument. where: UPL = Upper Process Limit LPL = Lower Process Limit UIL = Upper Instrument Limit LIL = Lower Instrument Limit Suitability of Instruments

24 Example: Module transfer process between a space vehicle and the International Space Station (ISS). Measuring heater voltage and resistance. Step 4: Evaluate instruments for Suitability d)Process Accuracy Ratio (PAR) Calculation: Use the following formula to calculate PAR for each measurement and each instrument. Centech for the 57.7 Ω process measurement: Suitability of Instruments

25 Example: Module transfer process between a space vehicle and the International Space Station (ISS). Measuring heater voltage and resistance. Step 4: Evaluate instruments for Suitability d)PAR Calculation: Repeat for all measurements and instruments. Suitability of Instruments

26 Example: Module transfer process between a space vehicle and the International Space Station (ISS). Measuring heater voltage and resistance. Step 5: Intended use: other applications? If you believe the selected instrument may be used in other applications, you must perform this same procedure to determine suitability of the instrument for those applications. Suitability of Instruments

27 Example: Module transfer process between a space vehicle and the International Space Station (ISS). Measuring heater voltage and resistance. Step 5: Cost Factor Centech 37772: $20 PAR: One at 3.6:1 Others > 8:1 Fluke 87V: $400 PAR: All > 9:1 Agilent 34401A: $1k PAR: All > 300:1 Agilent 3458A: $9k PAR: All > 2000:1 Suitability of Instruments

28 One more thought... After you become comfortable with this Suitability process and calculating PAR, you really should consider taking it a step further... Process Uncertainty Ratio (PUR): Takes into consideration other errors being introduced while making process measurements which include: Operator training Gage Repeatability & Reproducibility (Gage R&R) variations Environment in which the instrument is being used Storage conditions for the instrument when not in use Handling conditions for the instrument over its calibration interval These will be touched upon in the other two presentations. Suitability of Instruments

29 In the end, running your business is not only about international, federal, customer, or internal requirements, policies, or procedures – it’s about making a safe, reliable, superior product that fills a need/desire in the market place and is profitable for your company. Measurement Quality Assurance should be designed to help you minimize risks in your decision making process about your product’s safety and quality. Suitability of Instruments is a key part of guaranteeing good measurements! Too often MQA is not fully implemented (all 10 categories), causing the reliability of your Measurement Quality Assurance Program to lose value and become ineffective. If you’re going to put the effort and money into only some parts of this program, or you simply do not recognize all of the factors, it will likely cost you elsewhere through rework, recall, or consumer perceptions. Make your Measurement Quality Assurance Program robust so that it works for you to keep cost and safety issues to a minimum and profits up! Measurement Quality Assurance/Risk

30 Thank you for attending! Questions?


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