| General > General Technical Chat |
| Review: Hantek DDS 3X25. Anyone own one? |
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| saturation:
I concur with mecha, but to simplify it, for square waves, for a nice clean sharp edge, I've got at least 10 MHz, and with sinusoids at least to 70 MHz, and useful up to its limit of 100 MHz. This is the limit of what I can see myself, using my scope, not that its truly the limit of the 3x25. I start to see edge roll off at about 20 MHz, where the harmonics are over 100 MHz, beyond my unmodded Rigol 1052e capabilities. Compare to what you get with other function generators of 20 MHz, such as the Rigol 1022 at $400+, and you see you get a good bang from the lowly 3x25. The cleanest waveforms for all types are in definitely in the 10 MHz and lower region. So it gives good high frequency for general purpose use well matched to a home lab scope. --- Quote from: Lunat1c on May 12, 2011, 08:25:26 am ---oh. If the problem is during transition only I can't see it affecting me that much at this point. At least I hope not :) One question, what's the maximum frequency of all waveforms with the latest modifications you have posted? --- End quote --- |
| torch:
OK, pictures. Channel one is OUTPUT, Channel 2 is SYNC OUT. 5MHz 10MHz 25MHz |
| saturation:
Thanks torch, looks pretty good given the rise time is 4.7ns on the sync signal. I recall there is a filter on the V-out so it causes more rise time delays but your unit looks like its performing as it should. --- Quote from: torch on May 12, 2011, 12:49:02 pm ---OK, pictures. Channel one is OUTPUT, Channel 2 is SYNC OUT. 5MHz 10MHz 25MHz --- End quote --- |
| Mechatrommer:
confirmed mine is the same as torch's. maybe for my definition a good square will be up to 2MHz or at most 3MHz. but thats subjective and depend on what you are doing. so far, i still use the sine signal the most, so no issue at higher freq. |
| torch:
--- Quote from: Mechatrommer on May 12, 2011, 05:46:28 am --- and pls dont blame anybody (incl me) if you found out this unit is not for you. --- End quote --- Absolutely not! Please don't misunderstand, I'm not saying anything of the sort! Thanks for all your work on this. I'm new to all this and so I was not sure if this was a normal waveform distortion or not. I thought it might be abnormal because the SYNC OUT waveform was obviously much more square at higher frequencies than the OUTPUT waveform. I thought it should be the other way, if anything. But if this is normal and this unit does the job for so many who know more than I, then I'm happy with the deal -- as you pointed out, this is far cheaper than any comparable product. BTW: I should mention that the sinusoidal waveform is very clean all the way up to 100mhz, and at that speed, the SYNC OUT is also sinusoidal. |
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