It has to be inverting or the correction loop would be unstable.
The entire amplifier is configured as an inverting amplifier with the
feedback resistors setting the gain and hence the output.
The chopper amp merely nulls the summing junction voltage by applying a
correction to the noninverting input of the amp.
The feedback is only negative if the chopper amp is inverting.
Bruce
Dick wrote:
Thanks, Bruce. Very helpful; still can't see it, tho'.
Dick
Message: 2
Date: Tue, 04 Dec 2012 22:47:56 +1300
From: Bruce Griffiths<[email protected]>
To: Discussion of precise voltage measurement<[email protected]>
Subject: Re: [volt-nuts] Fluke 332D
Message-ID:<[email protected]>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Dick wrote:
I need a little circuit help here -- I'm looking at the schematic of the
chopper amp, A5A4, and I'm trying to figure out if this amp is inverting or
non-inverting for DC signals, that is from pin 6 input to pin 4 output. I'm
looking at the simplified diagram on page 102 of the PDF manual, Fig 8-1, 3 of
3. The detailed circuit for the chopper is on page 104.
Best,
Dick Moore
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Inverting.
Bruce
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