modified 11 years ago

Again measuring water resistance

01:05:41

This time, I measure the middle resistance with a DC signal by rectifying the AC input. Next I take the input and amplify it. 
The other two supplies are for helping the system reach its values at 20 kOhms faster. 
I'd like some advice on how to improve the time response of the capacitive filters.

published 11 years ago

hurz

11 years ago

I don't know what this is, but just add a 90degree phase delay to the AC source and EC will give you a faster answere to you problem

Amauri

11 years ago

Thank you!

Amauri

11 years ago

It worked, but the voltage at the first resistor used to be 184 mV and now it shows about 300 mV.

Amauri

11 years ago

Which one is correct then?

hurz

11 years ago

I measure 267.5mV peak and i think your 184mV is suppose to be given as rms value. So everthing is perfect!

Amauri

11 years ago

Still have problems with the response. If I vary the value of the middle resistance (water's), I will need the output to quickly show the difference.

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