Re: hi.in ADI Water Analysis Solution for pH Meters.pdf there is a block in the name of programmable ac current in conductivity meter . i can not understand why there is not a single current source for that

hi erbi i think there is aproblem with this scheme using for the source of current because most of water conductivity meters have the impedance of 2000 to 3000 Mohm and they can be to about 100 Mohm or .01 usiemence in their range so these unbalance can cause error due to the adc measurements. could you give me a solution to get those impedance?erbe