Other Parts Discussed in Thread: INA237, INA238, INA228, INA229, TLV700, INA186, ADS1100, INA191
Can you suggest some hardware or electronics for voltage source V1 ,V2 and DAS in the below circuit to work.
I have attached the circuit and also pasted it here.PIM_Fixture_DEC_04.pptx
Please find below and attached, the proposed circuit to measure the RESISTANCE of the SAMPLE, which is a metal strip (referred below as “SAMPLE UNDER TEST”).
- We have estimated that the PIM (SAMPLE UNDER TEST) sample has a resistance in the range of a few 100 micro ohms (< 1 milli ohm).
- Hence, we intend to use the PIM sample itself as a shunt resistor.
- In the below test fixture, following are the settings:
- We use a Variable power source that can be set to deliver a constant current (10A in this case) at a low voltage (1V)
- We use another voltage source to provide 5V or 10V to the INA190A5 current sense amplifier. INA190A5 (Gain = 500) is used to measure the current flowing through the PIM sample.
- The voltage output from the INA 190 A5 is measured by the Data Acquisition System (DAS).
- Using the measured voltage from INA190 A5, we determine the resistance of the PIM sample, as follows
- Since we expect the PIM resistance to be less than 1 milli ohm, we expect the Vout to be not greater than 5V.
i. Set current = Iset = 10A
ii. Gain of the current sense amplifier (INA186A5) = Gain = 500
iii. Measured voltage at OUT pin of INA186A5 = Vout
iv. Resistance of the PIM sample = R
v. Hence R = (Vout) / (Gain x Iset) = (Vout) / (5000)