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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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