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DMM # of digits versus ADC bits
Hi guys,
I was wondering how to compare DMM # of digits versus ADC bits. Let me explain. Suppose I have a 5.5 digit DMM. On the 10V range the last digit would then indicate 00.001V is 1mV. If I have a 16bit ADC that is almost 100dB dynamic range, lets take 100dB for the discussion. That’s a factor 10^5, so if I input 10V to the ADC the LSB would be 0.1mV.
I was wondering how to compare DMM # of digits versus ADC bits. Let me explain. Suppose I have a 5.5 digit DMM. On the 10V range the last digit would then indicate 00.001V is 1mV. If I have a 16bit ADC that is almost 100dB dynamic range, lets take 100dB for the discussion. That’s a factor 10^5, so if I input 10V to the ADC the LSB would be 0.1mV.
Is that reasoning correct?
Background: I have a 16bit USB scope and the software can also display the signal in a voltmeter format. That voltmeter shows 6 digits, with the last one fluctuating all the time. I can set it to 5 digits and then it is steady. Just trying to get my head around the numbers and accuracy.
Jan
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