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# Tomography_Resistivity Measurement System using Four Point Probe

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The resistivity measurement system that used was based on the four point probe Schlumberger configuration

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### Tomography_Resistivity Measurement System using Four Point Probe

1. 1. Exercise 1: The resistivity measurement system that used was based on the four point probe Schlumberger configuration and it is shown in figure 1 Figure 1 :The Measurement System The circuit diagram of a constant current source is shown in figure 2.If we apply input voltage Vin ,this circuit produces the same output current irrespective the changes in load resistor Rload .Since the output current Io equals the current through R on the resistor R,hence the the circuit shown here has a nearly infinite load resistance. For Vin=0.6V and R=3000 ohms ……{given} current Io can be calculated as follows Io= Vin/R Io= 0.6/3000 = 0.0002A or 0.2 mA Actually by changing the load resistance Rload the opamp output changes its voltage to keep the current Io remain constant. Vin = 0.6V Vload R=3KOhm Figure 2 : Constant current generator