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Siglent SDS1104X-E In-Depth Review
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Performa01:
Sorry, but I’m unable to reproduce this behavior. Everything works as expected with firmware 7.6.1.20R1.

Just to make sure it isn’t a problem with one specific channel, I’ve used all 4 channels in parallel, each of them fed with the same 50Hz sawtooth signal (for easy recognition of the signal polarity) and channels 2, 3 and 4 inverted.

First at 100ms/div:


SDS1104X-E_INV234_100ms

Now at 5ms/div:


SDS1104X-E_INV234_5ms

Quite obviously this works as expected.

Well, these tests are with a properly triggered signal in standard Y-t mode, so I tried to resemble the original scene with its somewhat unusual trigger settings (which don’t provide any trigger at all in this case anyway) and invoked roll mode. This results in untriggered roll mode at 100ms/div. Even changed the channel units to Ampere, just to make sure there is no hidden bug related to that:


SDS1104X-E_INV234_100ms_untriggered_roll

Now switching timebase to 10ms/div results in randomly (auto) triggered acquisitions, yet the signal polarity hasn’t changed on any channel.


SDS1104X-E_INV234_10ms_untriggered

tautech:

--- Quote from: Wessel Lemmer on March 23, 2018, 10:13:57 pm ---Thank you, i tried looking for where to find updates, obviously without success. I've applied the update 7.6.1.20R1 now but i'm afraid its still happening.

--- End quote ---
Just check 20R1 is showing in the System info page. If not apply it again.
Wessel Lemmer:
Wow, thanks for the efforts. yes the version is now 20R1 in the system page.
There is a real possibility that i'm just an idiot, but here's what i did to replicate

Default
ch1 set to 5v/div
switch on ch3
ch3 invert on
ch3 set to 50mv/div
timebase all the way to 1ns
timebase back to 2ms,it happens when i go from 1ms to 2ms
Performa01:

--- Quote from: Wessel Lemmer on March 24, 2018, 04:29:08 am ---Wow, thanks for the efforts. yes the version is now 20R1 in the system page.
There is a real possibility that i'm just an idiot, but here's what i did to replicate

Default
ch1 set to 5v/div
switch on ch3
ch3 invert on
ch3 set to 50mv/div
timebase all the way to 1ns
timebase back to 2ms,it happens when i go from 1ms to 2ms


--- End quote ---

No, not an idiot at all :) - you have just found a bug that isn't easy to spot.

Following your sequence, I could reproduce it.

I've notified Siglent R&D about the issue and expect a fix with the next firmware version.
Wessel Lemmer:
Thanks, and apologies if this wasn't the right place to post. Excellent review by the way and i have to say i love this scope. 
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