Products > Test Equipment
SainSmart DDS120 & DDS140 USB Oscilloscope
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coromonadalix:
@bianchifan

Did you check for probe calibration compensation  ???, a small adjustable capacitor in the base bnc connector of the probe

I had this problem before, badly calibrated probes were messing measurements, and had poor results in voltages.
bianchifan:

--- Quote from: doctormord on February 14, 2016, 06:56:10 pm ---I would return it, this device is pretty much out of spec.

--- End quote ---
OK, at least I did so.
NO answer from Amazon, nothing...but wait.. since 2 days they are offering a warehouse DDS140 ;)

Meanwhile I checked my new DDS140 and this device seems ok.



--- Quote from: ganzuul on May 20, 2014, 04:29:20 pm ---The two probes are of the model TP6100, which when sold separately reportedly cost $9 on eBay. They are probably not true 100MHz probes, but one review of them that I saw referred to them as "good stuff".

--- End quote ---
IMHO the probes are "bad" stuff, I wasn't able to calibrate the 1kHz rectangle correctly.
With my TP6100 probes all is fine in 1:10 position.
USB voltage is measured at around 4.9V, fine also.
At the moment I hope to work with.
doctormord:

--- Quote from: bianchifan on February 14, 2016, 04:35:47 pm ---DDS140 V1.4
--- End quote ---

Not working anymore.  :-\
bianchifan:

--- Quote from: doctormord on March 12, 2016, 02:48:46 pm ---
--- Quote from: bianchifan on February 14, 2016, 04:35:47 pm ---DDS140 V1.4
--- End quote ---

Not working anymore.  :-\

--- End quote ---
It works for me, just even tested.

Nevertheless an alternative:
https://mega.nz/#!pgdHHQIY
_________________

I wonder about the options 5V/div and 2V/div..IMHO they are nonsense >:D
Feeded with Voltageges about 6V or more will cause the scope to strike.
A red line will be displayed combined with loud beeping.

merbanan:
@doctormord can I get you permission to upload your image of the DDS120 pcb to the sigrok wiki website ? Earlier this week the Hantek 6022BE got supported with a driver and a firmware. I would like to extend that to support the DDS120. Right now I want to  document the hardware first.
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