AD623 is selected in the system, which is a kind of
instrument amplifier with low-price, high-precision,
high-gain, low-power consumption. Therefore, it’s an
ideal device in the high-resolution data acquisition system.
The gain G of AD623 is set by an external resistor. Gain G
can be set as high as 1000, which brings users great
convenience. Impedance RG between 1 foot and 8 foot of
AD623 decides Gain G using the formula