Again, this video shows the Vrms problem in the latest firmware CONFUSED by a boy who has NO IDEA how to operate his scope!!! He is using regular coax cable but keeps changing the Probe setting from the 1X setting it should be.
Can't you see youtube annotations/subtitles?...
If you cannot, please try watch my video directly on youtube or try palemoon browser (harmless firefox custom browser). And please check on youtube settings annotations on.
First, they are not bnc cables, they are 1x/10x 250Mhz probes.
And RMS issue is something like:
Say you made an amplifier ie. 100x gain and want to measure input vs. output RMS value with rough distortion check with rigols shitty FFT.
If you use single channel for only RMS measurement everything is fine, but FFT level is wrong because it's also showing RMS level! (again can't you see youtube annotations?).
Then you want to see RMS values, input on ch1 and output on ch2 (ie. ch1 probe set 1x and ch2 set 10x).
This leaked RMS error voltage seen on ch2 (even input grounded!!! or nothing connected!!!) = ch1's leaked value + someshit x ch2 probe compensation settings (regardless input on ch2).
like ch1 (at 1x) RMS =1V, ch2 (at 10x) RMS leaked let's say =10.5V (patience there is nothing connected on ch2 yet and flat line on screen
), when our imaginary amp output is connected on ch2 now RMS =110.5V!!!
If you are using 100x probe on ch2 error leaked value you gonna see is 100x!!!
Let's set some cursor on ch2 RMS value, cursor/settings/auto/quick2, even nothing connected cursor jumps over on ch1's signal and horizontal settings affect this cursor position.
Sorry it is not finished yet... If you dare to open other channels same time for RMS measurement, oh boy
.
For clear the things i am not accusing anyone, i like very much rigol devices (i have ds5022m,ds1052e,ds1054z,ds2000a and wens 820 portable scope), i am not after precision or accuracy with 8bit adc, what i am saying is this device under warranty and our local rigol dealer does not give a sht. besides something very bad happened at rigol software side since last year. Becasue they are not that bad in my opinion, and i'm wondering what happened their support and development line.
Last, i know how to use a scope markF....
No hard feelings, i wish you well and sorry for long post with my crappy english.