I have been using my Rigol 1054z for almost a year now, and I've practiced safe scoping habits the whole time. I haven't had any problems until after yesterday, when I last night did a self-cal. I didn't see anything unusual afterwards, and I only measured low voltage signals (signal gen output, so limited to +/- 20V). But today when I sat down...
I noticed that the signals from a DUT didn't seem as large as I remembered, so I tested.
1) Yellow probe against cal. port. Result: very weak (low voltage) waveform, badly distorted. Adjusting probe does nothing. Blue probe changes nothing.
2) Multimeter check CH1 input: Open.
3) Multimeter check CH2 input: 1.00 MOhm. When turning on CH2, small temporary jump to 1.05 MOhm or so.
4) All other inputs work like CH2.
5) Then I realized that I don't hear any clicks when I turn on CH1!
6) The relay that clicks when going from the 2V to 5V range seems to work, but the clicks sound different than the same clicks on CH2-4.
So looking at the
input schematic, something must be broken...
Any ideas where to start? I don't have a 2nd oscilloscope. Very sadly, I probably don't have a warranty either: I opened my unit for the EEVblog forum since I had a
new (and at the time, unseen) board revision. It turned out that they simply removed the pads and whatnot for the logic analyzer section, so nothing was gained from that. So unless one of you has a Rigol hologram sticker to donate, or knows where to get one...
I
can't imagine that a self-cal could have broken the input section, could it?
edit: I broke the input section. The self-calibration will
PASS with a blown input section. See below for actual details.