hi all,
m designing a ph meter using ca3140 for the first stage where we in m directly connecting the probe of the ph electrode to pin 3 of the opamp and thru pin 2 feedback is attached... and also tried attaching 100k & 10M resistance in between pin 3 and electrode... but since the impedance of the probe is high m not getting proper results...what should i do? please help me out
m designing a ph meter using ca3140 for the first stage where we in m directly connecting the probe of the ph electrode to pin 3 of the opamp and thru pin 2 feedback is attached... and also tried attaching 100k & 10M resistance in between pin 3 and electrode... but since the impedance of the probe is high m not getting proper results...what should i do? please help me out