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Review: Hantek DDS 3X25. Anyone own one?
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asbokid:
We need an AWG for generation of Gaussian white noise.   Are these any good for that?  Is there an in-built white noise function?   The sample size is just 4KSa, so for white noise injection for our minimum test period (1 second), the samples would have be transparently looped.  If that's possible.  Also, for this project, bandwidth is needed up to 20MHz really.   Not sure whether it would be suitable for our special needs  :P  which is adding background noise to a transmission channel to test comms transceivers.  If it is good, I will write a Linux driver, if no one has already done/doing so?

Any special deals available?    Saelig sold out long ago at US$100. Though today there are plenty vendors on fleabay charging US$145 shipped.   Taobao (China merchant site) has the DDS 3X25 listed for US$116 plus shipping.

There is also the DDS-3005 at US$230, with a higher bit depth than the DDS-3x25 - (14 bits instead of 12), higher sample size (256 KSa instead of 4KSa) but a lower maximum frequency (5 MHz instead of 25MHz).

Any thoughts?  What about other manufacturers of budget USB-based AWG/FGs?

cheers, a


(Click to enlargify)
torch:
Yes, both the supplied software and Mechatrommer's "Goltek" software have noise generators. The supplied software actually has two: gaussian noise and white noise. They both run continuously.  You can run either Hantek or Goltek without the DDS 3x25 physically present in a demo mode to see if that meets your needs.
alm:
As far as I know the DDS-3x25 is not very flat across its spectrum, so the white noise may not be so white. The limited sample size may also limited the low frequency power unless the software can update the sample memory fast enough.
asbokid:
Way-dee-day!   Thanks guys for your insights.  I shall give it some thought.  Dunno how pure white the noise really has to be. It's complex with a (DSL) transmission channel when it undergoes so many transformations to understand the final effect of the noise  :o

I will go and make some f****ing noise with the demo programs!

cheers, a

Mechatrommer:
goltek will not be able to create white noise for you, its only to send arb signal to dds3x25, try using tektroniks ArbExpress to create white noise. if you really serious about white noise, the 3x25 memory might not be enough for you. do you mean your white noise requirement really maxed to 20MHz?
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