General > General Technical Chat
Review: Hantek DDS 3X25. Anyone own one?
saturation:
Please add your review when you get it!
--- Quote from: Mechatrommer on February 09, 2011, 02:01:21 pm ---damned! i just hit it, buy it now from ebay chinese seller. wish me luck.
--- End quote ---
Mechatrommer:
--- Quote from: saturation on February 09, 2011, 03:18:38 pm ---Please add your review when you get it!
--- End quote ---
i dont think i can do any better than yours. and i'm not in rush, just want to make early preparation before i can start any project. maybe i will just have a rough look when the thing arrives. and to see if there is any prospect from pc programmability point of view. i hope i'll come out with something ;)
frogblender:
I took delivery of a DDS-3x25 a week ago. After 1 hours of fiddling:
- Same ±5.5nS jitter on square waves as others have noted above.
- Sine wave generation seems OK. Above 30 or 40Mhz it starts to become visibly distorted, but not horribly so.
- I haven't messed with sync out
- Software is not very good (me=Win7-32pro)
- virtual frequency adjust knob (on the screen), when turned by the mouse, changes freq in ONE Hz increments - Useless above 100Hz.
- many options grayed-out in the software, reason unknown. Can't sweep.
I also bought a Hantek DSO5202B 200MHz scope, which is not bad at all for the price. Although this is off-topic, I had a wild dream about using the generator and scope together as a Network analyzer (would give me a nice graph of amplitude and phase response as a function of freq for my device-under-test) - anyone have any ideas how to do this? I also have this scope-and-generator-in-one:
http://syscompdesign.com/CGR101.html
which produces beautiful bode plots - but only up to 2MHz - I need something up to 10MHz. Any ideas?
saturation:
LARGE Hi res PCB photos are here, I did not take them, just found it by accident:
http://biot.com/p/
Small versions as teasers
saturation:
Good you brought these up:
I don't have the unit at hand, but I recall the knob can be spun fairly quickly. BUT, you'll find that is uses only the first 5th or 6th most significant digits, but software will allow you adjust in any position before it, and thus, will not result in any output.
Options are greyed out until you select the mode, then only the appropriate menu appears. For example, until you select square waves, the subfunctions for square waves are not available, such as adjusting duty cycle. The same thing for sweeping for AM and FM.
You can use a signal source and a scope in the X-Y mode of the scope, and evaluate Lissajou patterns. It will provide phase, amplitude and frequency relationship between 2 channels.
One advantage of USB scopes is that the raw data can be imported into software for presentation in any format, such as Bode plots. But if you were trying to test your hardware for its frequency and phase response for practical reasons, you now have basic tools to make that assessment. For example, the syscomp image would appear as a very squashed line at 12kHz in phase, then a turn to equal proportions at X=Y amplitude, and begin to move from a circle to an ellipse as the phase shifted.
http://en.wikipedia.org/wiki/Lissajou#Practical_application
--- Quote from: frogblender on February 09, 2011, 04:02:08 pm ---I took delivery of a DDS-3x25 a week ago. After 1 hours of fiddling:
- Same ±5.5nS jitter on square waves as others have noted above.
- Sine wave generation seems OK. Above 30 or 40Mhz it starts to become visibly distorted, but not horribly so.
- I haven't messed with sync out
- Software is not very good (me=Win7-32pro)
- virtual frequency adjust knob (on the screen), when turned by the mouse, changes freq in ONE Hz increments - Useless above 100Hz.
- many options grayed-out in the software, reason unknown. Can't sweep.
I also bought a Hantek DSO5202B 200MHz scope, which is not bad at all for the price. Although this is off-topic, I had a wild dream about using the generator and scope together as a Network analyzer (would give me a nice graph of amplitude and phase response as a function of freq for my device-under-test) - anyone have any ideas how to do this? I also have this scope-and-generator-in-one:
http://syscompdesign.com/CGR101.html
which produces beautiful bode plots - but only up to 2MHz - I need something up to 10MHz. Any ideas?
--- End quote ---
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