Multiply, amplify, divide - that's ok to get it calibrated.
But adding 20 values... why is that?
In fact, it isn't even easy to create a non linearity. Better to
focus on gain ( as in multiply, amplify, divide) and offset (adding,
subtracting constant values).
Make 3 measurements, 1mA, 5mA, 10mA. Plot them on paper.
If you can draw a straight line through these 3 points, your meter
is linear. From there, you can figure out the error in gain and offset,
and find a way to fix that.
Best wishes, Frank
----- Original Message -----
From: "Jens Boos" <[email protected]>
To: "neonixie-l" <[email protected]>
Sent: Wednesday, March 16, 2011 10:42 PM
Subject: [neonixie-l] Re: Nixie tube amperemeter
Background: I use a 10 Bit ADC (MAX1242) at the internal reference of
2.5V, amplify the voltage drop over my 5 ohms shunt resistor by 15.6,
add 20 values and then divide by 64.
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