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Review: Hantek DDS 3X25. Anyone own one?

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Pentium100:
I used the original opamp, while finding datasheet of a part is quite easy, finding a part that is compatible with some other part is usually difficult.
Also, thanks for the schematic, I'll consider building it (hopefully the frequency is not too high for a perfboard).

Hmm... what if I put a couple of 4V zener diodes from the output to ground and then a resistor in series with the output? They should protect the output somewhat without routing the damage to the power supply.

Mechatrommer:

--- Quote from: Pentium100 on March 15, 2012, 11:03:30 pm ---what if I put a couple of 4V zener diodes from the output to ground and then a resistor in series with the output?
--- End quote ---
for the diode, watch out output attenuation at higher frequency, your output flatness curve could be changed, but i'm not sure, never done that.
for the series resistor, you WILL alter the output impedance to greater than 50ohm, not really matter if you always work with high input impedance device/dut, but for low input impedance could be a problem. the device already has series 50ohm resistor on the output (50ohm output impedance).

Pentium100:

--- Quote from: Mechatrommer on March 16, 2012, 03:46:11 am ---for the diode, watch out output attenuation at higher frequency, your output flatness curve could be changed, but i'm not sure, never done that.
--- End quote ---
Not really a big problem - if I want a continuous wave, I can just use my oscilloscope to measure the voltage and set the software so the output is what I need. If I want a swept frequency wave, I can measure the drop and a dd the correction to my program.


--- Quote ---for the series resistor, you WILL alter the output impedance to greater than 50ohm, not really matter if you always work with high input impedance device/dut
--- End quote ---
Yes, the devices that I used this generator so far all had high impedance (at least a few kiloohms).

calin:
I have been looking around on the net but with not too much luck ... Does anyone know if it works under Linux? I mean if there is a USB driver available. Even if there is no software I am fine as long as there is a way to speak with this thing over USB there is hope to get some Linux software for it... Thinking to write something my self just so I have a fun project to do.

Sincerely I am really thinking to buy one of these, it really looks like the best bang for the buck to me.

Bored@Work:

--- Quote from: calin on June 01, 2012, 04:34:40 am ---I have been looking around on the net but with not too much luck ... Does anyone know if it works under Linux?

--- End quote ---

It doesn't, and Hantek couldn't care less.


--- Quote ---I mean if there is a USB driver available.

--- End quote ---

No.


--- Quote ---Even if there is no software I am fine as long as there is a way to speak with this thing over USB

--- End quote ---

Sure, there is a way. Apparently the Windows software/driver is able to talk to it over USB. Therefore any other system knowing the USB protocol should be capable to do so. Only that no one knows the protocol, and the Hantek people, providing the typical Chinese kind of service, don't answer any questions.


--- Quote ---Sincerely I am really thinking to buy one of these, it really looks like the best bang for the buck to me.

--- End quote ---

Lots of shortcomings, limitations and bugs.

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