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Displayed information only correct in AC coupling mode

Posted: Wed Nov 13, 2019 3:33 am
by Racc
Hello everyone. I hope you can help me with the troubleshooting. When I am measuring PWM pulses in DC mode (1khz test pulse) the information ( frequency, duty cycle,etc) were not displayed correctly. They are randomly changing. But when I change the coupling to AC the information were displayed correctly. So I have to change from DC to AC coupling just to get the correct data. Not sure why the oscilloscope is behaving this way. Can someone help me with this issue. Appreciate your support. Thank you.