Poll

What is your interest in the Hantek DDS 3x25?

I own one
33 (25.6%)
I am considering getting one
40 (31%)
Curious about the hack
15 (11.6%)
Just passing through
41 (31.8%)

Total Members Voted: 107

Author Topic: Review: Hantek DDS 3X25. Anyone own one?  (Read 237163 times)

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Offline Sebi11

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Re: Review: Hantek DDS 3X25. Anyone own one?
« Reply #525 on: November 08, 2013, 12:57:04 pm »
Hi all,

It seems I have some progress since my last post and now I have a lock in amplifier working by using the Hantek function generator. However, when I scan frequency the lowest frequency step I can reach with Hantek is 125 Hz. Is this a characteristic of this module or am I doing somewhere a mistake?
 
 

Offline domasj

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Re: Review: Hantek DDS 3X25. Anyone own one?
« Reply #526 on: December 22, 2013, 05:52:32 pm »
Hi,
I wrote a Python library to access Hantek DDS 3X25. It was inspired by tymm. It works in Linux (tested in Debian) and should work in Windows.

What works:
  • (unreliable) waveform sending
  • clock divider setting
  • digital IO pins
  • frequency and pulse counter

Library: https://bitbucket.org/kuzavas/dds3x25/src
Information on the hardware and protocol: http://sigrok.org/wiki/Hantek_DDS-3X25
 

Offline bob808

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Review: Hantek DDS 3X25. Anyone own one?
« Reply #527 on: December 22, 2013, 06:19:45 pm »
Would this work on a raspberry pi? :)
 

Offline domasj

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Re: Review: Hantek DDS 3X25. Anyone own one?
« Reply #528 on: December 23, 2013, 07:01:33 am »
It should work on Raspberry Pi.
 

Offline bob808

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Review: Hantek DDS 3X25. Anyone own one?
« Reply #529 on: December 23, 2013, 10:56:41 am »
I'm thinking if I could make a standalone unit with a raspberry pi and a LCD. Need to finish my current projects and I might see if it's worth a shot.
 

Offline vehf277

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Re: Review: Hantek DDS 3X25. Anyone own one?
« Reply #530 on: February 07, 2014, 03:45:28 pm »
Hi everybody!

I am newbie in this thread.
I bought Hantek 3X25 a few days ago and found some strange/wrong in coming out signals.
I checked three wave types - sine, triangle and saw. All three signals are 500mV 1000Hz. The signals are looking as normal but a signal envelope looks like not a flat bar but a mixture(not a modulation) of signals, 1kHz and much lower frequency. You can see the screen captures made by OWON SDS7102.
The question is: is it normal for Hantek 3X25 or not, did anybody see this the same and if it's wrong how to fix it?

Thank everybody in advance for help!:)
« Last Edit: February 07, 2014, 06:24:18 pm by vehf277 »
Excuse me for my English:)
 

Offline saturation

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Re: Review: Hantek DDS 3X25. Anyone own one?
« Reply #531 on: February 12, 2014, 08:19:13 pm »
It looks like you cabling issues as your 'carrier' is modulated or mixed with what looks like line frequency, ~ 60 Hz.  The Hantek output is quite clean if properly hooked up.
Best Wishes,

 Saturation
 

Offline vehf277

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Re: Review: Hantek DDS 3X25. Anyone own one?
« Reply #532 on: February 23, 2014, 12:46:20 pm »
Thank you!:)
Excuse me for my English:)
 

Offline TriodeTiger

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Re: Review: Hantek DDS 3X25. Anyone own one?
« Reply #533 on: June 28, 2014, 05:34:53 am »
The thread spawned an interest in me to purchase one of these on a small eBay sale for $120 :) It's got its quirks, but suits me for anything I can possible think of on the lower frequency end.

With my new scope to be written about, I measured the sync phase offsets on a sine wave with the beautiful GolTek software (the original supplied software wouldn't let me write a DLL file to system32, even with admin privileges or manual copying of it beforehand :palm:)

Code: [Select]
  100kHz: Sync Phase: -1 degrees / -20ns
  1MHz:   Sync phase: -9 degrees, -25ns, sync jitter: +/- 5ns or 3 degrees
  10MHz:  Sync phase: -70 degrees, -20ns, sync jitter: +/- 4ns or 10 degrees, (sine at this point)
  20MHz:  Sync phase: -160 degrees, -25ns, sync jitter: +/- 1 ns or 5 degrees
  20MHz+: (Mostly noise at this point.)

That seems pretty useless for anything over 1MHz for sync.

Ah well, all for now.

EDIT: Odd, his phase correction turned off reduced the error by ~10x, 1 and 10MHz offset becomes ~2ns now. What's up with that? That's significant for 10MHz, since phase is now only +/- 5 degrees instead of 70.

A goodie shot, transfered through a 3.5'' medium of some kind, I remember those :wtf::
« Last Edit: June 28, 2014, 06:51:16 am by TriodeTiger »
"Yes, I have deliberately traded off robustness for the sake of having knobs." - Dave Jones.
 

Offline tymm

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Re: Review: Hantek DDS 3X25. Anyone own one?
« Reply #534 on: November 01, 2014, 12:54:10 am »
Just as an update, I've done a bit more work on the DDS3x25 Python code and - while things are by no means complete - I think it's in not too bad shape for most general use... There are simple interfaces for generating sine & square waves of arbitrary frequencies, for setting/getting digital IO values, for using the counter, etc. 

Code can be found here:
https://github.com/tymmothy/dds3x25
 

Offline torch

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Re: Review: Hantek DDS 3X25. Anyone own one?
« Reply #535 on: January 13, 2016, 02:22:51 am »
Geez, over a year since anyone has discussed this little guy. Well hopefully someone is still familiar with it.

Does anyone know the required parameters for the external trigger input? Voltage, waveform, frequency limitations? I thought maybe I could use this as a time mark generator by triggering a pulse from an OCXO sine wave, but I just get a flat line from the output. If I disconnect the bnc cable, it reverts to internal triggering. Thinking that 10MHz might be too fast, I tried a 500Hz sine from a tone generator with similar results. When I tried a 10Hz square wave from a 555 timer, I see a brief flat line then the internally triggered waveform each time I click the "External Trigger" button. I've tried voltages from 250mV to 12V.

Any suggestions?
 

Offline ElektroQuark

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Re: Review: Hantek DDS 3X25. Anyone own one?
« Reply #536 on: April 06, 2018, 05:41:48 am »
Anyone has one of those working under Linux?
Sigrok has had it in "Planned support" for some years now.


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