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I just have some very simple questions to ask.

I'm testing a basic 3 OP instrumentation amplifier

I have to short V2 to ground and test V1 from -2V to 2V, in 0.25 increments.

I then have to short V1 to ground and test V2 from -2 to 2V in 0.25 increments.

the results i have for V1 are for example:

2 vout = ~12.2

1.75 vout = ~11.4

1.5 vout = ~ 10.8

1.25 vout = ~ 9.2

.

.

...

i then have this equation to find the gain:

∂vout/

∂vin1

when i'm doing this equation, i'm not undestanding the ∂. do i add up all the results and then divide it by all the vin1's added up like:

12.2+11.4+10.8.../2+1.75+1.25...

or will i just take one result like 11.4/1.75.

i know this is stupid question, i just wanna know if i'm doing it right. either way i do it, i get like ~6.

when i do both the tests, each gain is ~6. do both the gain of each of the buffer amplifier add up 6+6=12 and 12 is the overall gain for the INA?

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# Homework Help: Testing instrumenation amplifier

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