Products > Test Equipment

SainSmart DDS120 & DDS140 USB Oscilloscope

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doctormord:
Right, my software is actually only for the DDS120/Buudai102 as i stripped some code to cleanup and understand whats going on.

May you upload the 1.4 somewhere?

Regards,

Christian

bianchifan:
At the moment I'm a little disappointed..
Ok, 16MHZ can be displayed, but the device/AD is quite noisy, no stable curves, triggring  :palm:
Test signal, what?  :--
Measure window is only a bad joke.
The scaling on Y even, for ex. 5V USB Voltage will show a line at 6.3 V, with 1/10 divider at 0.59 V.

DDS140 V1.4

doctormord:
Are you complaining about the Channel 2 reading? I would suggest to switch this channel on first - it's actually off at both screenshots.

bianchifan:

--- Quote from: doctormord on February 09, 2016, 07:23:33 pm ---Are you complaining about the Channel 2 reading?
--- End quote ---
???? :-//
Of course CH2 is switched off when nothing to do.
But I can tell you, it's quite analog to CH1.
My pics are showing the test signal, should be square... |O
Even a slowfrequent triangle from an old XT2206 has noiserounded edges.

I attach some more pics:
- test signal how it should look like due to help screen
- USB voltage from breadboard supply, should be 5.03 V
- same through probe divider
- noise from shorted CH1 at 1V/div - 200MSamples
- same at 50mV/div
- clock signal at 16MHz crystal of an ATMEGA16 circuit

EDIT:
Forgotten..
CH1 triggers when time base is less/equal 0.1 ms
CH2 triggers never, no way  :-- :palm:
When stopped (triger ext.) it displays a much better waveform, only slightly rounded.

doctormord:
May you upload the 1.4 somewhere?

Have you tried to run a "calibration" with both channels on and shorted? That normally cancels out the offset for each voltage setting. If this doesn't help, i'd blame the multiplexer they use. There were some issues with this in the DDS120 as well.

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