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Rigol MSO 5000 hardware/software revisions

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skander36:
With fw. 03 I have tested level on which ch.3 is activated and I have found that over 23,5 mV on ch1 , ch3 is activated . Under 23,5 mV ch3 is not activated. So ch1 activate ch3 (and some time ch4) .

typoknig:
I just got my MSO5074 this week. It is HW rev 01.01.000 and came with FW 00.01.01.04.08. I ran the following tests, updated the FW to 00.01.02.00.03 without performing a self calibration, ran the tests again, then performed the self calibration, and ran the tests one last time.  I got the same results in all three scenarios and never saw a single ghost channel. Only when a grabber was on the probe was that probe's channel activated:

All probes disconnected, rubber caps over BNCs, pressed AUTO 10 times

All probes disconnected, rubber caps off BNCs, pressed AUTO 10 times

Each probe connected by itself with grabber and ground lead, pressed AUTO 10 times

Each probe connected by itself without grabber, but with ground lead, pressed AUTO 10 times

Each probe connected by itself with grabber, but without ground lead, pressed AUTO 10 times

Each probe connected by itself without grabber or ground lead, pressed AUTO 10 times

All probes connected with grabbers and ground leads, pressed AUTO 10 times

All probes connected without grabbers, but with ground leads, pressed AUTO 10 times

Is it possible those of you seeing the ghost channel have had a less than perfect self calibration? Maybe some interference like LED lights or a leaky wireless device caused the self calibration to be inaccurate?

NoisyBoy:
I'll be damned, typokbnig is on to something I never considered - WiFi interference!

I have a high power mesh network running in my home, I have been seeing a consistent 1+ mV noise on my scope, oddly, only on channel 2 but none of the others.  I was about to send the scope back to Rigol for repair.

When I powered the scope up tonight, channel 2 became the ghost channel that would always come on when I press Auto (which did not surprise me as I know about the Channel 2 noise issue).  Thanks to typoknig's suggestion, I powered down the mesh satellite closest to the scope, and guess what, the noise is gone, and no more ghost channel issue!

I am not surprised about the interference, I should have known better, but I am surprised that it only manifested in a single channel, perhaps it is less shielded than the others.  Anyway, armed with this new finding, I will leave the WiFi satellite off and run a full calibration this evening.

Back to skander36's comment, I have supplied signal of varying voltages to channel one up to 5V p-p, and I have not been able to get any ghost channel to come on.  So the suggestion of trying it outside of WiFi range and LED lights may well worth a try and see if it makes any difference.  However, like you, I have not seen this issue in firmware 04.08, so I would agree Rigol might have lowered the turn-on threshold just enough for this problem to manisfest in our scopes.

Just finished a self cal, noise level is consistent across all 4 channels, right at around 303uV (at 2mV/div) with +/- 3 uV across channels. 

Gandalf_Sr:
Wow, graet wrok typoknig!

skander36:
Hi , @typoknig and @NoysyBoy ,
Thank you for your suggestions. I also give that tips to others but I was not able to follow for myself  ... :)
I moved the scope away from bench (into other room) and after calling default settings (Restore Defaults)  from boot menu (single key), I was doing a self calibration .
Now the ghost channel activation does not appear anymore .

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