Can anyone help me in finding whether AD620 is in working condition?
The simplest way to check that the AD620 is in working condition is to do a functionality test. Power up the device with your preferred supplies. If you will use dual supplies, you can ground the reference pin. You can then apply a dc voltage to the input and check the output. WIthout a gain resistor installed, you should just have a gain of 1.
If you are already working with a schematic, it would be good if you can provide it so I can get an idea of what your circuit looks like. Also if you are experiencing a problem with your circuit, a description of the results you are getting would be very useful.
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