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Rigol MSO 5000 hardware/software revisions
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sb42:

--- Quote from: NoisyBoy on March 16, 2020, 01:45:27 pm ---What is your hardware version?

--- End quote ---

01.01.000, MSO5074.


--- Quote ---I tried calibration last night, but skander36 is right, it made no difference.  Channel 3 came on with nothing attached.

I wonder if Rigol lowered the turn-on threshold with Auto across 5000/7000/8000, and the noisier front end on some 5000 triggers this problem. 

Regardless, the channel should not come on when there’s nothing attached.

--- End quote ---

I'll see if I can post some noise measurements.
skander36:

--- Quote from: sb42 on March 15, 2020, 03:38:25 pm ---As noted earlier, I'm on firmware 00.01.02.00.02 and cannot reproduce the auto problem.  Because NoisyBoy says it's a random event, I wrote a little script to test this repeatedly:


--- Code: ---#!/bin/bash

addr="192.168.8.32"
check="2 3 4"
wait="3"
repeat=5000

for ((i = 0; i < repeat; i++)); do
    lxi scpi -a $addr ":autoscale"
    sleep $wait
    for c in $check; do
        res=$(lxi scpi -a $addr ":channel${c}:display?")
        if [[ "$res" == "1" ]]; then
            echo "failed at iteration $i: channel $c is on" >&2
            exit 1
        fi
    done
done

--- End code ---

So, activate AUTO, wait 3s, check if channels 2-4 are active. With the scope rebooted and set to defaults, the script has been running for an hour with no spurious channel activations so far.

Looking at the screen however, I notice that activating AUTO will occasionally (say 5-10% of the time) display a (flat) waveform for channel 2 for just a moment, which then disappears when the display settles. All channels other than CH1 stay off and their buttons are not lit. If I toggle channel 3 on and off before running the script, then it's that channel's waveform that flickers on and off instead; likewise for channel 4.

TL;DR - I still can't reproduce the problem but there's now some other thing that I don't know what to make of :-//

--- End quote ---

Try this :
Set Default -> Activate G1(default settings) connect a cable from G1out to CH1 input->Press AUTO

Let us know what's happened.
Maybe some scopes are defective .
sb42:

--- Quote from: skander36 on March 16, 2020, 08:12:45 pm ---Try this :
Set Default -> Activate G1(default settings) connect a cable from G1out to CH1 input->Press AUTO

Let us know what's happened.
Maybe some scopes are defective .

--- End quote ---

That displays the sine wave on CH1, the other three channels stay off.
sb42:
Here's a quick measurement from a rev 01.01.000 MSO5074 running a modified 00.01.02.00.02:



Not too impressed with those noise levels, Rigol :--

It looks like CH3 is "special", so maybe that's a clue. I tried AC-coupling it to no avail.

Anyone else want to try this or tell me where I goofed? :)
NoisyBoy:
Interesting!  I just ran the same test, VRMS on the 1.00 hardware is around 302uV for channel 1/3/4, channel 2 is about 323uv.  It may very well be a manufacturing variance.
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