tictac
Full Member level 5
Hi
I want to measuring 0v to 3000 volt with atmega32. I use divider resistor for adjusting the high voltage betwean 0 and 5 volt.
Rup=5 M-ohm , 30 watt
I can easily measuring the voltage below than 2400 volt with 3 volt accuracy. but for the voltage that higher than 2400 volt I have some problems.
for the first minute of showing the voltage with the mega32 it has a good accuracy but after a while the measured voltage goes up slowly !!! I think its because of resistors that is warm. what can I do to prevent the measured voltage goes up ?
Regards
I want to measuring 0v to 3000 volt with atmega32. I use divider resistor for adjusting the high voltage betwean 0 and 5 volt.
Rup=5 M-ohm , 30 watt
I can easily measuring the voltage below than 2400 volt with 3 volt accuracy. but for the voltage that higher than 2400 volt I have some problems.
for the first minute of showing the voltage with the mega32 it has a good accuracy but after a while the measured voltage goes up slowly !!! I think its because of resistors that is warm. what can I do to prevent the measured voltage goes up ?
Regards