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Review: Hantek DDS 3X25. Anyone own one?

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marmad:

--- Quote from: marabut on June 15, 2013, 02:15:08 pm ---marmad,
thank you for sharing the knowledge. I'm glad that my suspicions weren't distant from truth.  :)
Is there a function to read digital pins too?
My biggest concern is now speed of USB communication through Hantek's dll: implementation of any serial protocol that way means sending and receiving single bits using Hantek's provided commands. I've got an idea how communication works from asbokid's post earlier in this thread - but know nothing about achievable update frequency.
Have you done any "responsivity" tests?

--- End quote ---

Yes, DDSGetDigitalIn, but on the DDS-3X25 (at least), the IO pins are separated: 6 input and 12 output.

I have done tests with the speed but I don't have any recorded numbers left anywhere. I just remember it was painfully slow (in computer terms), making it very difficult to do things 'quickly'.

For my own purposes, eventually I realized that it makes more sense to get a proper SCPI-controlled device - instead of plowing more hours into trying to 'force' the Hantek into doing things that either it can't do well - or were never properly documented for us mere 'customers'.

For example, how is the Hantek software doing smooth, glitch-free, zero crossover sweeping? With the documented DLL commands, this is impossible - causing either a glitch when a new waveform is downloaded to the AWG - or non-zero crossings when just changing frequency.

marabut:

--- Quote ---I just remember it was painfully slow (in computer terms), making it very difficult to do things 'quickly'.

--- End quote ---
Rather discouraging.  :(
Maybe I will be able to send single bytes, but nothing more. It should be enough to control attenuator and LPF but not enough to sniffing I2C or get amplitude measured through the same interface.
Well, we'll see - I'm buying 1025G on Monday.
Thank you all for your help.

Winston:
I'm considering buying a 1025G.  In the "user manual" (and I use that term very loosely), there is one reference to a sweep dialog selection in the drop-down utility menu, but that box is never shown.  Is that a sweep frequency setting dialog and, if so, what are the sweep options available?

marabut:
This option in Hantek's supplied software is rather limited. The dialog box itself looks like that i've attached. Only basic settings and you can use only sine waveform (sweep option is grayed out with all other waveforms).

Winston:

--- Quote from: marabut on June 27, 2013, 04:52:54 pm ---This option in Hantek's supplied software is rather limited. The dialog box itself looks like that i've attached. Only basic settings and you can use only sine waveform (sweep option is grayed out with all other waveforms).

--- End quote ---
Thanks for that screen shot.  Scanning over this long thread, it looks as if the 1025G is inferior to their older 3x25 in many ways, including older, less capable Windows software, loss of some I/O capability, and the need to draw all power from USB which may be problematic on some laptops.  Would I be better off just buying a new in box 3x25?

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