![]() Is the current method I am using valid? Can I measure nanovolt differences using this method. I am only interested in measuring the difference i.e voltage drop across silver foil before solution mixed and after solution mixed (does not have to be accurate). Ie if you have a voltage drop across the foil of a few mV and the input offset of the opamp is +/- 3mv, with a temperature coefficient of so many ppm/degree, what does your measurement mean?īut start by finding out your foil material and thickness and go from there. ![]() In such a scenario you may be better delivering an ac current and measuring an ac voltage - this also deals with the problem of removing the input voltage offset of the amplifiers you use. If you know the thickness of the foil, you can calculate the resistance of your strip from the bulk resistivity of the metal - that would be very useful.Īnd do you really mean silver ? Ag ? or aluminium - cooking foil ?Īt these very low resistance values you should use Kelvin connections for measuring the voltage drop - the resistance of the connecting wires will be significant.Īnd if you're etching the foil with highly ionic chemicals any contamination of the connections will set up galvanic voltages which could be much bigger than the small voltage you're trying to measure. Is there any other more effective and reliable methods of measuring differences with nanovolt resolution? ![]() When the silver foil will be mixed with some chemicals, its electrical properties will change slightly and hence its conductiivity as well. The Arduino ADC gives an output, visualized with the serial monitor. So I am taking the Vout from this divider i.e the drop across the silver foil(R2)(I know the jumper wire resistance will contribute to this drop as well) and then amplifying it using an opamp set to 100 gain. These R1 and R2 are connected in series using jumper wires in the breadboard. I have a voltage divider circuit set up with R1 being a 4 ohm resistor and R2 being a 5cm pure silver foil with dimensions 5cm length and 1cm width(presumable having a resistance in the milliohms range). ![]() ![]() Hi for a project I am doing, it would be useful to measure voltage fluctuations in the microvolt/nanovolt area. ![]()
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