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Review: Hantek DDS 3X25. Anyone own one?

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Mechatrommer:
update:

1) my 3x25 went wacky this night. it happened when i screwed (burnt) some opamp circuit, probably some kickback making the fpga (i believe) intermittently hanging more than before. opened up, resolder everything, now better, but still happening sometime. morale, fondle your 3x25. any idea how to protect the opamp/fpga output from things like esd and spikes? any idea on how to download, save or upload and refresh the fpga FW?

2) latest SW version 3.2.1.9 available http://www.hantek.com/Product/DDS-3x25/DDS3X25USB(3.2.1.9).rar, for who want to try, i wont bother to download (i owned ver 3.2.1.7) but would love to hear if any major changes.

edit: forgot to tell, i disabled the "set wave on device startup". enabling it making thing worst, ie the unit will hang even if we disconnect and reconnect it to usb, even several time.

marmad:
Hey Shafri -

Thanks for the heads-up about the new software version - I will check it out and report back if there are any noteworthy changes.


--- Quote ---edit: forgot to tell, i disabled the "set wave on device startup". enabling it making thing worst, ie the unit will hang even if we disconnect and reconnect it to usb, even several time.
--- End quote ---

Yes, I tried to use this feature many times - and it's REALLY buggy... best to avoid unless desperate for the functionality.

Edit: BTW, your link address has a comma in in - causing a 404 error - corrected is:  http://www.hantek.com/Product/DDS-3x25/DDS3X25USB(3.2.1.9).rar

Edit2: I don't see any changes in the software - and there's no change log provided - so I assume it's just bug fixes in the new version.

marmad:
BTW, when using "set wave on startup device", are you following the manual's instructions for disabling it when you don't want to use it anymore (quoted below)?  Since it assumes you are not using the USB (for control or power) it seems to 'lock' out the interface, requiring manual override:

"If you don’t want to generate the waveform which is saved in the hardware memory, connect the “CONTROL” BNC end to ground before inputting power to this instrument. You can use a Short-Circuit Cap as shown in below."

marmad:
One other funny thing I noticed when comparing different versions of the manual for the device:

The users guide that comes with the software has, in the Hardware Specifications section:
Frequency Resolution = 0.1%

The users guide which is downloadable separately at the Hantek site has:
Frequency Resolution = ....

I guess there are different ways we could interpret that  ;D

Mechatrommer:
good to hear from you Mark. i thought you'ar dead :D


--- Quote ---BTW, when using "set wave on startup device", are you following the manual's instructions for disabling it when you don't want to use it anymore (quoted below)?
--- End quote ---
not sure. i enable/disable it by software/api discussed last time. i did use 0ohm terminator at the back all the time, and wave is saved in HW memory all the time, ie if i pull the terminator away, the wave will start on startup. i have no issue whatsoever with goltek software "wave on startup" before, until last night.

i suspect the fpga is vurnerable to spike/transient from outside (output port or usb power? connection), and now mine is more vurnerable than before. it happened several time this night, but luckily i can revive it by unplug/plug usb. i remember i had to unplug/plug 3 times on one occasion and/or unplug and wait a moment and plugin again to make it work. i also had an occasion where during changing the square wave to sine wave, the fpga converted it halfway, so the output is half square and half sine and then hanged (wave output still ON but unable to comm with software, ie hanged), i had in another occasion, the fpga simply output random shape when commanded, inverted square, uneven rounded sawtooth wave etc (and ofcourse hanged afterward). another symptom, during usb plugin, the signal goes high and stayed there and hanged. i feel its unlikely the symptoms came out of output opamp or DAC, it must be from the fpga, whatelse? i highly suspect. is it possible the FW inside the fpga got corrupted? i wish there is a way to refresh it. the fpga name has been scratched out, so we dont know what fpga it is, damned Hantek!

i did mod the usb power to add a smd ferrite (after the 0ohm smd jumper), reflow all the fpga caps. but its still happening, but better than last night. last night i thought i've lost the 3x25, but luckily not, i dont know for how long this will stand. thanks Mark for clarifying the newer vendor's SW version. i guess i will skip that. cheers ;)

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