Author Topic: EEVblog #1260 - $70 100MHz Oscilloscope?  (Read 5159 times)

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Offline cliffyk

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Re: EEVblog #1260 - $70 100MHz Oscilloscope?
« Reply #25 on: November 17, 2019, 08:01:16 pm »
No oscilloscope lacking variable holdoff can reliably trigger on aperiodic or burst signals.

I disagree, the JYETech DSO112A I referenced above does quite nicely on anything I've thrown at it--used it recently to monitor the "Echo" pulse from an ultrasonic sensor, quite nicely and reliably. It also passes the 10 cycles of 10 kHz burst test the 5012H chokes on...
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Online CatalinaWOW

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Re: EEVblog #1260 - $70 100MHz Oscilloscope?
« Reply #26 on: November 18, 2019, 12:47:48 am »
For what these scopes are costing you can get a high quality used scope.  The used scope will likely have high quality documentation (both use and repair) available and be repairable.  The only advantage for these scopes is their small size and the isolation from battery operation.  Newbies looking for a new scope who do not live in a closet will probably be better off going used.  But these things do have uses, just as the pocket size multi-meters can be very useful for some things.
 

Offline David Hess

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Re: EEVblog #1260 - $70 100MHz Oscilloscope?
« Reply #27 on: November 18, 2019, 02:17:26 am »
No oscilloscope lacking variable holdoff can reliably trigger on aperiodic or burst signals.

Th issue with 5012H is that it never properly triggers on single time events. Not eve once. There is a firmware bug.

The triggering could still be broken by design and admittedly some "toy" DSOs I have checked out were awful.  I am just saying even a perfect trigger can fail on aperiodic or burst signals.

I disagree, the JYETech DSO112A I referenced above does quite nicely on anything I've thrown at it--used it recently to monitor the "Echo" pulse from an ultrasonic sensor, quite nicely and reliably. It also passes the 10 cycles of 10 kHz burst test the 5012H chokes on...

Could it have had just exactly the right combination of sample rate and record length to produce a trigger rearm time long enough to produce good results on those specific tests?  I wonder what kind of algorithm for a DSO would allow automatic triggering on burst signals without user adjustments.

Back when I used analog oscilloscopes which lacked a holdoff adjustment, one of the tricks to triggering on a difficult signal if I was desperate was to adjust the variable horizontal control to trim the time/div to a point where the trigger rearm time was just right.  This left the horizontal scale uncalibrated but provided a stable display.
 

Offline Fungus

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Re: EEVblog #1260 - $70 100MHz Oscilloscope?
« Reply #28 on: November 18, 2019, 04:50:14 am »
Does anyone have opinions about the 2-ch SainSmart Mini Digital Oscilloscope DS212 or 4-ch DSO213??

yeh, the DSO213  seem the most interesting of the cheapie portable ones, and also quite expensive for the specs,  so perhaps do work better.

Assuming it's the thing that used to be called "DSO Quad" then the DSO2103 is a great little device, mostly hampered by the user interface.

They're not cheap but if you need something tiny and battery powered then it's the one to go for. I'll definitely get another one if mine ever breaks.

Edit: There's various firmwares available for them, I'm not sure which firmware the eBay ones ship with but it makes a huge difference.
« Last Edit: November 18, 2019, 04:57:20 am by Fungus »
 


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