Amplifier Test

 

The ratio of rms/gain represents the noise of the amplifier.   Since real movement must be measured over this noise,it is desired that rms/gain be low. This graph illustrates the fact that increasing gain decreases the noise.

Data

     Vin (mV)

           Gain

             rms

      rms/gain

80

50000

11.5

0.00023

40

20000

7.5

0.000375

40

10000

6

0.0006

30

5000

5

0.001

15

2000

2.3

0.00115

10

1000

2

0.002

5

500

1.3

0.0026

3

200

0.43

0.00215

3

100

1.5

0.015

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