Uncertainty Calculation for 6mV Input on Linear Force Measuring Device

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SUMMARY

The discussion centers on calculating the uncertainties for a linear electrical output force measuring device with a specified input range of 0-100 lbf and a full-scale output of 30mV. The temperature effects on zero and span are both 0.002% per degree Fahrenheit. Given an input of 6mV, the expected uncertainty is +0.015/-0.012. Participants express confusion regarding the relationship between input and output values and how to apply the temperature effects correctly to derive the uncertainties.

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  • Familiarity with electrical output specifications
  • Knowledge of percentage calculations in relation to full scale
  • Basic principles of temperature effects on measurement accuracy
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Engineers, technicians, and students involved in measurement systems, particularly those working with force measuring devices and seeking to understand the impact of environmental factors on measurement accuracy.

pinkcashmere
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Homework Statement


A nominally linear electrical output force measuring device has the following manufacturer
specifications:

Input range : 0-100 lbf
Full Scale output : 30mV

Temperature effect on:
Zero 0.002 % full scale/degrees Fahrenheit
Span 0.002 % of reading/degrees Fahrenheit

The device is used in an environment where the ambient temperature is not controlled
and can vary between 50 and 95°F.

For an input of 6mV, what are the uncertainties from these effects?

Homework Equations

The Attempt at a Solution


I am supposed to be getting +0.015/-0.012 as the answer but I don't know what I should do to get this. I have tried 0.002 % of 100, 30 , 60 but nothing is working
 
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pinkcashmere said:

Homework Statement


A nominally linear electrical output force measuring device has the following manufacturer
specifications:

Input range : 0-100 lbf
Full Scale output : 30mV

Temperature effect on:
Zero 0.002 % full scale/degrees Fahrenheit
Span 0.002 % of reading/degrees Fahrenheit
Can you elaborate a bit on what these mean?
pinkcashmere said:
The device is used in an environment where the ambient temperature is not controlled
and can vary between 50 and 95°F.

For an input of 6mV, what are the uncertainties from these effects?
I'm confused. Above you say that the input range is 0 - 100 lbf (pound feet?), and the max output is 30mV. Just above you say that the input is 6mV. Do you have the inputs and outputs switched?
pinkcashmere said:

Homework Equations

The Attempt at a Solution


I am supposed to be getting +0.015/-0.012 as the answer but I don't know what I should do to get this. I have tried 0.002 % of 100, 30 , 60 but nothing is working
 

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