Hi Jens,
You only have a gain adjustment, nothing to compensate for offset.
Your opamp has a small offset and is also multiplied by the gain of the
circuit.
At zero current, what voltage do you have on pin 2 of your DAC.
It should be 0V. From your previous measurements I suspect a
small negative offset there, 20mV perhaps.
Best wishes,
Frank
----- Original Message -----
From: "jb-electronics" <[email protected]>
To: <[email protected]>
Cc: "threeneurons" <[email protected]>
Sent: Saturday, March 19, 2011 1:09 PM
Subject: Re: [neonixie-l] Re: Nixie tube amperemeter
Hi all,
here is the schematic for my amperemeter.
http://www.jb-electronics.de/tmp/amperemeter_schematic.png
Jens
Am 18.03.2011 02:25, schrieb threeneurons:
On Mar 17, 6:13 am, jb-electronics<[email protected]>
wrote:
Got any pictures ? I think in pictures.
A quick and dirty schematic of your setup would be nice.
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