PSN-L Email List Message
Subject: Re: Advantages of more ADC bits
From: Brett Nordgren brett3nt@.............
Date: Fri, 06 Feb 2009 23:38:59 -0500
The main advantage of more bits is the *possibility* of greater
sensitivity. Very weak signals will appear to be less 'stairstep'-like.
When properly set up, the sensor voltage output should clip at the same
level as the max A/D count. That means that with a 24-bit A/D, each bit
represents a much smaller signal than you would get with a 16-bit
device. However, everything depends on the noise level of the sensor and
of the site, and only the best require the sensitivity available from 24
bits. The microseism, instrument and cultural noise level at most amateur
sites would very likely not justify the additional sensitivity of a 24-bit
BTW, most 24-bit digitizers actually achieve something less than 24,
depending on the sampling rate.
At 07:57 PM 2/6/2009 -0800, you wrote:
>I have been considering what advantage the amateur seismologist might see
>if making an upgrade to more bits in the A/D converter.
>First, some background. If any of this is incorrect, please offer
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