Input impedance of Analog inputs

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Posted ByWill White on November 16, 2001 at 10:57:21:

Hello! I need to know the input impedance to the analog inputs. I am trying to interface a high voltage probe to the PLC's analog input and the probe needs to see a 10 MOhm impedance to properly measure the voltage (it is really just a compact voltage divider). I have tried measuring the input impedance to analog input 1 and come up with a value of about 330 kOhms. Is this correct?

Thanks,

Will

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