How to read a calibration certificate for thermo hygrometer

#1
Hello. Does anybody knows how to read a calibration certificate for thermo hygrometer? I understand that Measurand mean reading is from the device being tested and standard mean reading is from the standard device. If for example, the measuarand mean reading is 21.0 deg Celsius and the standard mean reading is 20.4 deg Celsius. Ans the correction is -0.6, and the uncertainty of measurement is +/- 0.70.. What does it mean? I'm really sorry if my question seems simple enough for most of you but I'm really having a hard time explaining this to my superiors. Thank you for your time and understanding.
 
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dwperron

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#2
Hello. Does anybody knows how to read a calibration certificate for thermo hygrometer? I understand that Measurand mean reading is from the device being tested and standard mean reading is from the standard device. If for example, the measuarand mean reading is 21.0 deg Celsius and the standard mean reading is 20.4 deg Celsius. Ans the correction is -0.6, and the uncertainty of measurement is +/- 0.70.. What does it mean? I'm really sorry if my question seems simple enough for most of you but I'm really having a hard time explaining this to my superiors. Thank you for your time and understanding.
Standard Mean Reading is the actual temperature applied to your unit being calibrated.
Measurand Mean Reading is the result displayed on your unit being calibrated.
Correction is the difference between the Measurand (your instrument) and the Standard (actual temperature applied)

Uncertainty is a discussion all by itself. The simple answer is that no measurement is perfect, and has some amount of uncertainty that needs to be considered. For the equipment being used for this calibration the lab determined that the result produced by the unit being calibrated will be within ± 0.7° of the true value of the temperature 95% of the time.
 

dgriffith

Quite Involved in Discussions
#3
m2pineda,
At the risk of being presumptuous, be mindful of the words correction and error. Your cert has a signed correction to add, and as you can see, that is the standard minus the UUT (20.4 - 21.0 = -0.6). Adding the correction -0.6 to 21.0 returns the 20.4 reference temperature.
Signed error (deviation) is UUT - Ref, which returns the error with proper sign (21.0 - 20.4 = +0.6). Be careful when graphing calibration results and don't mix them together. All of this assumes same dimensions.
 
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