Issues
1) 100PLC boot problem, screen freeze.
(change PLC during frozen screen and reboot)
True, but not very annoying as not or hardly ever used I guess.
2) 512k readings memory isn't present/useable, should be according to specifications. (it's only 5000 samples)
Yep, at first I thought they just made a typo in their literature, they maybe meant 512K of sample memory or something.
But even then, 100 bytes per sample seems unlikely.
That said, if they wanted to say 512kbits, then it begins to make sense.
6) Webpage doesn't work (anymore) ? (commands are ok reading doesn’t work)
This one is actually the usual locale problem with java programmers who hard-code their dot and comma separators, instead to ask the API for the current locale.
Try to set your local to US english and it'll work.
I've reported this Bug to Rigol a few month ago, but there was no new release since, so let's hope it will be for the next one.
9) My cooling fan seem to sit a bit lose since it makes a silent rattling noise sometimes.
Mine is whisper quiet, it's actually the quietest fan of all my Rigol gears.
Remarks & Improvements
a) Second function only frequency, some DM3058(E) screenshots are shown on DM3068 pages. (The DM3058 has second measurement)
This made me regret to have chosen the 3068, the last digit is kind of useless anyway as this DMM is so noisy that you can't make any use of it, so better go for the added functionality of the 3058.
Frankly, I don't understand why the 3068 has less functionality that the 3058, except for the trending.
i) Current source diode test, 0.997mA and 99.7µA etc.
This has been added in the latest firmware. The voltage is also increased so that you can now test leds.