EEVblog Electronics Community Forum
Products => Test Equipment => Topic started by: Doogs75 on May 14, 2022, 08:45:28 am
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Hi. After work (school) foolishly throwing out a great old CRO (that weighed a tonne), I've delved into the world of digital oscilloscopes, in particular the Rigol MSO-5074 (a product creep/upsell from a 1000 series). I've been very surprised to find that they don't seem to support multiple/different horizontal scales - something the old analogue CRO did well. Looking through the manual seems to suggest "No", and there seems to be no-one who has asked the question (according to Google and my searching on this forum.
Does anyone know if it's possible (hidden feature, hack, big obvious button I'm missing, obscure menu, whatever)? I'd really like to use it (as I used to with the CRO) to show kids to show the method used by PWM dimming of LEDs and trailing-edge dimming of a triac based dimmer.... Funnily enough, 20Mhz and 50Hz don't quite show well at the same scale! Any suggestions, techniques to achieve the above, or ideas greatly appreciated (not sure if I can return/swap it if other makes/models do the job - but I'd try if they're ball-park same price). Absolute confirmation of "No" will also be appreciated, but in a different way.
Thanks in advance.
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The feature you want is called "Alternate Triggering". I don't know of any DSOs that can do it. It's just not the way they work.
There might be one somewhere but the Rigol MSO5000 isn't it.
Cue list of DSOs that can do it... :popcorn:
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Amazing what knowing the correct terms mean.... here's a pre-existing thread on the topic, which makes it sound like I'm actually after multiple timebases, which doesn't seem to exist any more:
https://www.eevblog.com/forum/testgear/out-of-curiosity-are-there-dsos-with-alternate-trigger/ (https://www.eevblog.com/forum/testgear/out-of-curiosity-are-there-dsos-with-alternate-trigger/)
And this thread which degenerates into analogue/digital, but still has some interesting info scattered throughout.
https://www.eevblog.com/forum/testgear/dual-timebase-oscilloscopes/ (https://www.eevblog.com/forum/testgear/dual-timebase-oscilloscopes/)
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The feature you want is called "Alternate Triggering". I don't know of any DSOs that can do it. It's just not the way they work.
There might be one somewhere but the Rigol MSO5000 isn't it.
Cue list of DSOs that can do it... :popcorn:
Alternate triggering is useful to look at signals that are similar in frequencies but not related so you need to trigger on then separately 1 -2 ,1-2 ..
If one signal is millions of time faster, you need alternate trigger and separate timebases (or two different zoom ratios....).
If you are looking at PWM that gets demodulated to 50 Hz, you trigger on demodulated signal, that one will be synchronous with PWM modulation, and look at high frequency signal in zoom window....
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Hello,
the DSO 2074G can trigger from all active channels with individual timebase
https://www.eevblog.com/forum/testgear/experience-with-dso-2074g/msg1194745/#msg1194745 (https://www.eevblog.com/forum/testgear/experience-with-dso-2074g/msg1194745/#msg1194745)
egonotto