Electronics > Beginners

Significant Digits and Uncertainty

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metrologist:
Hi All,

I was looking at a specification and wondered if this is presented correctly:

High Power: 32dBm ± 1dB; Total Uncertainty: 0.5dB
Low Power: 12dBm ± 1.5dB; Total Uncertainty: 0.75dB

I've forgotten if the number of significant digits or measurement resolution should all match?

Thanks

metrologist:
I was reading this:


--- Quote ---A number reported as 10,300 is considered to have five significant figures.
...
If the number is reported as 10,300 ± 53, the number of significant figures is still 4 and the number reported this way is acceptable, but the 3 in the 53 is not significant.

--- End quote ---

https://www.inorganicventures.com/significant-figures-and-uncertainty

David Cutcher CEG:
I'm going to suggest that this is an editing problem, not a significant figure problem.
David Cutcher "Certified Evil Genius"

sokoloff:
I was taught significant figure rules aligned with this page’s rules: https://courses.lumenlearning.com/introchem/chapter/significant-figures/

Where 10300 would have 3 (not 5) significant figures.

David Cutcher CEG:
I agree.
Where 10300 has an accuracy of half of the last significant figure.  Which means range of accuracy is between 10350 and 10250, unless otherwise stated.
If it had 5 sig figs, the accuracy would be between  10300.5  and 10299.5 
David Cutcher "Certified Evil Genius"

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