What is the measurement error in temperature differential if the indicated value is taken directly corresponding to millivoltmeter readout?
Understand the Problem
The question is asking us to determine the measurement error in temperature differential when using copper-constantan thermocouples and a millivolt recorder. It is important to analyze how the error in millivolt readout relates to the temperature differential of 5°F being measured at 200°F.
Answer
The error can be calibration-based or ± one-half of the last digit.
The measurement error in temperature differential when indicated by a millivoltmeter readout could be due to calibration errors generally expressed as a fraction of the full scale reading. For digital readings, the error is often ± one-half of the last digit.
Answer for screen readers
The measurement error in temperature differential when indicated by a millivoltmeter readout could be due to calibration errors generally expressed as a fraction of the full scale reading. For digital readings, the error is often ± one-half of the last digit.
More Information
Calibration errors in measurement can result in greater absolute errors as values increase, while digital instruments typically have a reading error of ± half a digit.
Tips
A common mistake is not considering the calibration error which can affect the accuracy especially at larger values.
Sources
- Measurements and Error Analysis - WebAssign - webassign.net
- Error Analysis in Experimental Physical Science - faraday.physics.utoronto.ca
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