Dear Wildcat,
thanks for your quick reply. After reading your words, I suspect that I might have a hardware problem. After investigating a bit further, I was able to break it down to the use of “NORML” trigger mode, as I usually leave it to “AUTO” and it gets switched to “NORML” in A&B mode, just as stated in your manual.
Attached my used config file and four screenshots, where I used “NOISE” as signal input (in real life I came across this while measuring PWM signals). It has been the same in wc3.4 and wc5.1 (factory app doesn’t support A&B mode, so I cannot test with that). In all screenshots the signal generator was connected to both channels. “NOISE” I only used because it’s directly next to “OFF”, the problem persists with any signal form.
When switching from TR D (rising edge) to A&B, channel A is dead most times (nearly always)
When switching from TR A (rising edge) to A&B, channel B is dead (sometimes)
When cutting input signal while in A&B (rising edge) and activating signal again, both channels are dead (most times)
Seldomly I am able to display both signals in A&B mode, but sometimes this is the case (see IMAG007.bmp, but it took about 10 tries to achieve this).
In AUTO mode, there’s absolutely no problem. Also, as long as the signal isn’t cut off, it doesn’t freeze once it works.
Possible causes I currently see:
- my device has a hardware fault that leads to faulty triggering in NORM mode
- my config file is corrupt
- it’s normal for this mode, and I misunderstand the concept behind this
Please don’t investigate too much, as I see it as a minor bug (in fact I accidentially activated A&B mode in wc3.4 and wondered why my channel suddenly seemed dead, mostly I use AUTO trigger mode for single channel). Unfortunately I have no option to test a different DSO203, as I only have this one available.
Again, thanks for your great work!