Hi!
I've asked Siglent support but after a couple of responses the thread went cold.
Maybe I'm being dumb but I've noticed that there's a frequency (low, around 100Hz) where scope response changes a bit. Below and above it square input looks square. Right about it square input looks slanted.
I tried to do a very slow "sweep" and there's small but visible change in the envelope. So, e.g. with a constant 600mV p2p input lower frequencies measure exactly that while higher ones measure 612mV, so ~2% diff.
Terminated 50Ohm cables (not that it matters at such a low freq) to be sure.
Latest firmware, after full self-cal. Siggen itself seems allright, I have an ancient Tek scope and the siggen output looks Ok there with same input/same cables.
Scope seems happy and fully functional otherwise, few years old though, out of warranty.
Has anyone else seen anything like that? Is this a normal behavior within the expected margin of error?
Thanks!
Thanks but unfortunately this is not a probe cal problem. Note that the issue is seen even in a 50Ohm environment, no probes.