I am getting variations in output order to amplify the output of shunt resister.
I am giving voltage across shunt resistor as input to the op amp LM324. But at different instant of time getting different outputs. I also replaced opamp many times but could not yield the required output. I am dividing the further output by voltage divider.
When no input is provided to opamp then output voltage across voltage divider= 0.8V
total opamp voltage= 0.24 when shunt voltage is zero.
shunt voltage in mV and opamp Vltage is in Volts.
It is not following the formula of output voltage V=-(Rf/R1)*Vin
1st observation
Shunt
Voltage
(i/p
to
opamp Output of apamp
across voltage divider
1.5 0.32 means output voltage of opamp =3*0.32=0.96V
1.6 0.29
2.0 0.36
2.5 0.43
3.0 0.51
3.5 0.57
4.0 0.64
4.5 0.71
5.0 0.78
6.0 0.93
7.0 1.09
8.0 1.22
10 1.53
14.0 2.03
15.0 2.57
18.0 2.78
19.0 3.09
22.0 3.57
After some time (around 15 min)
Observation 2
Shunt
Voltage
(i/p
to
opamp Output of apamp
1.7 0.28
2.0 0.30
3.0 0.41
3.5 0.46
4.0 0.53
4.5 0.58
5.0 0.64
5.5 0.69
6.0 0.76
7.0 0.88
8.0 0.96
10 1.09
12.0 1.30
18.0 2.52
22.0 3.03
input is in mV and output is in Volts.
i have taken 5 observations in the interval of 15-30 min each. and i got 4 different values
PLz reply asap.
I am giving voltage across shunt resistor as input to the op amp LM324. But at different instant of time getting different outputs. I also replaced opamp many times but could not yield the required output. I am dividing the further output by voltage divider.
When no input is provided to opamp then output voltage across voltage divider= 0.8V
total opamp voltage= 0.24 when shunt voltage is zero.
shunt voltage in mV and opamp Vltage is in Volts.
It is not following the formula of output voltage V=-(Rf/R1)*Vin
1st observation
Shunt
Voltage
(i/p
to
opamp Output of apamp
across voltage divider
1.5 0.32 means output voltage of opamp =3*0.32=0.96V
1.6 0.29
2.0 0.36
2.5 0.43
3.0 0.51
3.5 0.57
4.0 0.64
4.5 0.71
5.0 0.78
6.0 0.93
7.0 1.09
8.0 1.22
10 1.53
14.0 2.03
15.0 2.57
18.0 2.78
19.0 3.09
22.0 3.57
After some time (around 15 min)
Observation 2
Shunt
Voltage
(i/p
to
opamp Output of apamp
1.7 0.28
2.0 0.30
3.0 0.41
3.5 0.46
4.0 0.53
4.5 0.58
5.0 0.64
5.5 0.69
6.0 0.76
7.0 0.88
8.0 0.96
10 1.09
12.0 1.30
18.0 2.52
22.0 3.03
input is in mV and output is in Volts.
i have taken 5 observations in the interval of 15-30 min each. and i got 4 different values
PLz reply asap.
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