Hello, I have made a strange project i think its final purpose is not relevant so i will keep it simple. I want to measure the resistance (R2) by measuring the voltage drop across it and the current that is flowing through it. Now, i want to determine what is the resolution i need of both meters to determine to be able to distinguish between all R2 values i will have to measure. Their values i will be addressed shortly.

So the circuit simplified is the following:

The voltage source puts around 1.2V, the R1 range is [97 to 27052] and R2[ 15- 9000].

The trick part comes now, when one resistor varies the other varies too. And i don't need the same R2 resolution across all range, for instance, the difference between the first 2 resistors i want to measure is 500 ohms and between the last two is 0.13 ohms.

To make it easier to understand i made a table of the R2 values i want to measure and its corresponding value R1:

https://docs.google.com/spreadsheets/d/1iled8cYflFFZxyY9-t5CpszbZV1-1W-XvF9_N1zMdqE/edit?usp=sharing

What i would like to know, is how can i determine the resolution of my voltmeter and ammeter to distinguish the between all R2 values. Thank you

So the circuit simplified is the following:

The voltage source puts around 1.2V, the R1 range is [97 to 27052] and R2[ 15- 9000].

The trick part comes now, when one resistor varies the other varies too. And i don't need the same R2 resolution across all range, for instance, the difference between the first 2 resistors i want to measure is 500 ohms and between the last two is 0.13 ohms.

To make it easier to understand i made a table of the R2 values i want to measure and its corresponding value R1:

https://docs.google.com/spreadsheets/d/1iled8cYflFFZxyY9-t5CpszbZV1-1W-XvF9_N1zMdqE/edit?usp=sharing

What i would like to know, is how can i determine the resolution of my voltmeter and ammeter to distinguish the between all R2 values. Thank you

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