I am using a simple wheatstone configuration to measure resistivity of a material I have.
The problem is that when I am measuring the Voltage (Vg) with a multimetre and it is oscillating(fluctuating). It doesn't let me have an accurate reading since multimetre shows different values change each second.
I checked my circuit by measuring a 10k,12k and 15k ohm resistances without any problem (no fluctuation in the reading), so the circuit is fine.
What do you thing the possible causes of this oscillation on the readings? material structure/composition? the way how I should measure the Vg voltage?
Pd: Vs is DC