Is the internal setting of the signal connect port of the saleae equipment set?
For example, pull-down or EOS diode, etc.
If I connect the saleae equipment and take an oscilloscope shot at the same node, I can see some noise on the measurement signal.
@ukjae.yu You may want to take a look at your Saleae Logic’s input impedance. Our datasheets can be found in the link below in case this helps!
Something to keep in mind is that all ground pins on our Saleae Logic analyzers are shorted together, which are also shorted to your connected PC’s USB ground.