Hello Friends,
I am using LM358 as differential amplifier..
Input to -IN is 103.6mv and +IN is 104.6.
gain of the differential amplifier is unity..
so my question is with this input accordigto the trnsfer function it should give me 1mv output..
But when I check with Multimeter it shows me -5.5mV..
Why this is happening? and even my VDD is +5V and Vss is ground then how can it shows me -ve voltage????
I kept 100Ohm fixed resistor inplace of RTD(PT100)
As you can see the circuit..
My voltage measurmnet is as follows..
Test Point Voltage
T0 103.6mV
T1 104.8mV
T2 83.3mV
T3 53.2mV
I am using LM358 as differential amplifier..
Input to -IN is 103.6mv and +IN is 104.6.
gain of the differential amplifier is unity..
so my question is with this input accordigto the trnsfer function it should give me 1mv output..
But when I check with Multimeter it shows me -5.5mV..
Why this is happening? and even my VDD is +5V and Vss is ground then how can it shows me -ve voltage????
I kept 100Ohm fixed resistor inplace of RTD(PT100)
As you can see the circuit..
My voltage measurmnet is as follows..
Test Point Voltage
T0 103.6mV
T1 104.8mV
T2 83.3mV
T3 53.2mV