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| Review: Hantek DDS 3X25. Anyone own one? |
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| Mechatrommer:
try to sniff at dll level. i made a dummy DDS3X25Dll.dll and dump anything the hantek software is sending to it. the app layer will be like App->DDS3X25Dll.dll->USB driver. YMMV. freq change at zero crossing is one thing, signal sweep "flatness" is another, that can be a challenge since ds3x25 is not flat at >5MHz. i cant find the post or file in my HDD showing the flatness respond for my ds3x25. my Goltek provides option for flatness control, by carefully tuning and profiling your ds3x25 output curve. i also have not been able to solve the zero crossing freq change (or at least changing freq without changing signal phase or voltage level, i need to study back on this when i have time. i'm counting on marmad and other brilliant members on this. as for dave's video for bode plot, 1st it cant show phase shift 2nd is not a log scale vertically and horizontally. and 3rd it needs super flat FG. as someone posted in the thread, its a poor man "pocket" method after buying an DSO and FG at premium price. |
| marmad:
--- Quote from: Mechatrommer on December 14, 2012, 02:20:07 am ---i also have not been able to solve the zero crossing freq change (or at least changing freq without changing signal phase or voltage level, i need to study back on this when i have time. i'm counting on marmad and other brilliant members on this. --- End quote --- I think I'm done sinking hours into this device - let's face it, it's a pain in the ass to work with - and I've pretty much given up on the Hantek company. Their software is crappy; they don't release needed documentation on interfacing (as evidenced by the fact that their software can do zero crossing changes - but they've never explained how); and they won't release the source code even though they're hardly supporting their own products. And now there's the Rigol DG4062 2-channel AWG for €650 - a much greater value for the money - and I hear that it can be hacked to 160 or 200MHz :D It seems more economical in the long run to put the time into something that earns money towards one of the new Rigols ;) --- Quote ---as for dave's video for bode plot, 1st it cant show phase shift 2nd is not a log scale vertically and horizontally. and 3rd it needs super flat FG. as someone posted in the thread, its a poor man "pocket" method after buying an DSO and FG at premium price. --- End quote --- But I don't think anyone was suggesting that it was anything more than a simple method for getting a simple picture when you don't have another method immediately at hand. |
| T4P:
Of course, it's good as a 150$ AWG ;) No 150$ gen can come even close. in fact there isn't a 150$ AWG apart from hantek but hey. Crap but it works for 150$ fantastic as a "First AWG" :P If one is quite broke ATM |
| marmad:
--- Quote from: T4P on December 14, 2012, 05:33:32 pm ---Of course, it's good as a 150$ AWG ;) No 150$ gen can come even close. in fact there isn't a 150$ AWG apart from hantek but hey. Crap but it works for 150$ fantastic as a "First AWG" :P If one is quite broke ATM --- End quote --- Absolutely! No disagreement at all. It's just that I (and Mecha and others here, of course) have devoted dozens of hours of time trying to 'iron out' the annoying kinks - and add missing functionality - which keep it from being great. Speaking only for myself, I need to consider investing my time elsewhere and upgrade my AWG ;) But it certainly got me through some work I had to do with an AWG in the meanwhile. |
| zibadun:
--- Quote from: Mechatrommer on December 14, 2012, 02:20:07 am ---ds3x25 is not flat at >5MHz. i cant find the post or file in my HDD showing the flatness respond for my ds3x25. my Goltek provides option for flatness control, by carefully tuning and profiling your ds3x25 output curve. --- End quote --- I've tried GOLTEK generator and out of the box it generates a fairly flat sine. Unlike the Hantek software! Very good job! The problem is I need to do some extra things during the sweep every N steps (i.e. retune the LO of an SDR). Is it possible control the goltek via an API? If I can tell GOLTEK to output Freq X at amplitude Y via a DLL or something - that would solve my problem too, and save a lot of time banging the head against the wall ;) |
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