picstudent
New Member
Hai
The circuit attached is the setup I am using to measure current through R15 and R9.(0 to 500ma) OP07 (U2) opamp Amplifies this voltage 10 times and U3 (Op07)offsets this voltage to my ADC's range. (.798 to 3.298) U4 acts as a low pass filter.
The ADC programming and all is ok at the MCU part and reading is Ok for my purpose. My problem Is I find it difficult or not possible to calibrate it for my range.
I have to adjust RV3 RV4 and RV5 to tune amplification and offset. But when I adjust for 0, it is not ok at 500ma Area.
How I should tackle the situation. What is the procedure here to fine tune gain and offset so that my reading is consistent.
Please suggest
The circuit attached is the setup I am using to measure current through R15 and R9.(0 to 500ma) OP07 (U2) opamp Amplifies this voltage 10 times and U3 (Op07)offsets this voltage to my ADC's range. (.798 to 3.298) U4 acts as a low pass filter.
The ADC programming and all is ok at the MCU part and reading is Ok for my purpose. My problem Is I find it difficult or not possible to calibrate it for my range.
I have to adjust RV3 RV4 and RV5 to tune amplification and offset. But when I adjust for 0, it is not ok at 500ma Area.
How I should tackle the situation. What is the procedure here to fine tune gain and offset so that my reading is consistent.
Please suggest