zsolt1
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Negative input voltage is clipped by the OP input diodes. So you don't see the expected AC voltage with a multimeter.
?????the opamp i/p was in parallel not in series thus it must not be causing problem
no idea what you're exactly doing.why it is not following voltage divider formula...??
How are you generating variable AC voltage?
How are you measuring the divider input and output voltage?
Your readings look more or less linear is that not enough to measure a 500V??
0.377 / 70 * 100 = 0.538 you are getting 0.52, I believe after this 100V the curve will be more linear...
If you put the first and second series of measurements into a diagram, you'll notice a systematic offset that changes between both series. A QA engineer would take this as sufficient indication that your multimeter or another part of your setup is defective. (Or just the battery exhausted, whatsoever)here are further readings
Obviously, further guessing from a distance becomes meaningless at this point.
If you put the first and second series of measurements into a diagram, you'll notice a systematic offset that changes between both series. A QA engineer would take this as sufficient indication that your multimeter or another part of your setup is defective. (Or just the battery exhausted, whatsoever)
Obviously, further guessing from a distance becomes meaningless at this point.
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As far as I understand, there's no opamp involved at this point, just a voltage divider and a multimeter.But both the readings shows more or less linear operation of the opamp (something changed in the surrounding)............
so you use a transformer after all in your system ..... which is your ac main supply . Even autotransformers can saturate .... (i guess that the variable transformer you refer to is an autotransformer with cursor) I still suggest to use a low pass filter somewhere around the voltage divider . (EMI perturbations and harmonics affect all instruments.....)
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