K
Kelukelu
I have some problems, because I'm going to write for WI.
1.Is it any international standard calibration procedure for Balance, refrigerator ,centrifuge and others?
2. Can I test equipment using the development method that by myself ? (just simple measuring, not like use the hysteresis check, precision, accuracy...etc)
3. Is it correct for the uncertainty formula ?
Uncertainty and standard deviation:
*Uwr =Maximum standard deviation of reading x coverage factor ( 95% confidence)
*Ubr=Instrument uncertainty x coverage factor ( 95% confidence)
*Uc = √Uwr^2 + Ubr^2
e.g.
The acceptance criteria:
speed +-10% of the display
4. What is the role of QA ? Is QA double check the equipment or just verification for the test procedure to match the document (WI).
Or can it the test request one technician only , not need other technician to verification?
The more details for procedure (reference others company) and calculation as below
Balance :
Full calibration : off-centre loading, hysteresis check, precision and accuracy ( Departure from Nominal value).
Half year: precision.
daily: scale value check
each weighing : zero check
Temperature controlled enclosure
- nine point test for two years,
- centre point test for six month
Centrifuge:
Take 10 more reading.
Thank you very much.
1.Is it any international standard calibration procedure for Balance, refrigerator ,centrifuge and others?
2. Can I test equipment using the development method that by myself ? (just simple measuring, not like use the hysteresis check, precision, accuracy...etc)
3. Is it correct for the uncertainty formula ?
Uncertainty and standard deviation:
*Uwr =Maximum standard deviation of reading x coverage factor ( 95% confidence)
*Ubr=Instrument uncertainty x coverage factor ( 95% confidence)
*Uc = √Uwr^2 + Ubr^2
e.g.
The acceptance criteria:
speed +-10% of the display
4. What is the role of QA ? Is QA double check the equipment or just verification for the test procedure to match the document (WI).
Or can it the test request one technician only , not need other technician to verification?
The more details for procedure (reference others company) and calculation as below
Balance :
Full calibration : off-centre loading, hysteresis check, precision and accuracy ( Departure from Nominal value).
Half year: precision.
daily: scale value check
each weighing : zero check
Temperature controlled enclosure
- nine point test for two years,
- centre point test for six month
Centrifuge:
Take 10 more reading.
Thank you very much.