Products > Test Equipment
New toy(?) scope, DSO154pro, 1ch, claimed 40MS/s
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videobruce:
This "thing" wouldn't even qualify for a "toy" !!
Fungus:

--- Quote from: videobruce on March 06, 2024, 02:50:41 pm ---This "thing" wouldn't even qualify for a "toy" !!

--- End quote ---

Nonsense, they're awesome for what they are. Nobody's forcing you to read this thread.

This is exactly what you'd expect from a device that can only "see" the first two harmonics of a square wave:


ie. It can see the 5Mhz and 15Mhz sine waves in the signal but not the 25MHz sine wave (or higher)
Dave_g8:
Hi,
I agree that the DSO154Pro is excellent for the price, but you do need to be aware of its limitations.

The pre-shoot and overshoot on the square wave from the external signal generator is an effect of the sin(x)/x interpolation which is used by the oscilloscope to construct the displayed waveform.
The rise/fall time of the external signal is approximately 10ns.
The images below shows the Rigol (sampling 1Gsa/s) and DSO154Pro (sampling 40Msa/s) displayed waveforms for the 1MHz signal from the external signal generator.



There is no evidence of an anti-aliasing filter on the front end of the DSO154Pro which would limit the bandwidth to the ADC, so the results are as expected.

With the in-built signal generator at 1MHz, there is less ringing because the rise/fall time is limited by the waveform generator circuit and therefore the displayed waveform is closer to representing the actual signal.



If the time-base on the DSO154Pro is set to 200us/Div or greater, the sin(x)/x interpolation appears to be turned off. The trace below shows the displayed waveform with the external 1MHz square wave signal. In this case the trace is joining the dots between samples.


mojoe:
I had the rise time set to the fastest, which is 8.9 ns, if I remember. Thus, the Bart Simpson look.

I'll have to try changing the timebase to get "connect the dots". BTW, "200us/Div or greater" would imply to me more time per divison, not less. It's a matter of perspective. Once I looked at your screen grab, I knew what you meant.

Just a bit ago, I used my "toy" scope for something useful, without having to either take everything to the bench, or find room for a larger scope at the computer (not enough room). I bought some DS3231SN RTC modules, and wanted to test them to make sure they were actually the SN version, and not the M version. The M version only outputs 1 Hz, and cannot do 1024, 4096 and 8292 Hz, like the SN will. Also, the M has slightly worse long term accuracy.

I had previously ordered what were listed as SN, but received M. They were returned.

This type of use is exactly why I bought this tiny scope. I can take it in my carry-on luggage, along with some microcontroller stuff, to have something to do while I'm away for long periods for work.

Fungus:

--- Quote from: Dave_g8 on March 07, 2024, 07:24:24 pm ---I agree that the DSO154Pro is excellent for the price, but you do need to be aware of its limitations.

--- End quote ---

That's also true of $20,0000 oscilloscopes.
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