I just purchased a new Siglent 1104X-E and was looking at an external PPS signal and for some reason if I connect two probes to the same signal on channels 1 and 2, the two traces over lap as you would expect, but as soon as one probe is moved to chan 3 (or chan 4) there is a ~30ns offset between the two. In the attached image, the Purple and Yellow trace are chan 1 and 2 and the Blue trace is chan 3. They are all connected to the same signal. Does anyone have any ideas? is there something wrong with the calibration? or am just missing something. Any help would be appreciated.
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