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Review: Hantek DDS 3X25. Anyone own one?

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Mechatrommer:

--- Quote from: rev0 on November 28, 2011, 07:18:34 am ---I'd like to suggest the addition of a PWM waveform option on your Goltek program.
--- End quote ---
very good idea! i'll see what can i do and how to fit it in the program.
edit: about the AVR, i think you can program it with one adc input (trimpot) and the pwm output duty cycle will change based on the trimpot value.

RJSC:
This topic is getting a bit long to read straight from the beginning, but I understand that with the GolTek software, the jitter and sync issues are resolved, right?

Has anyone designed an amplifier so that we can use the DDS 3X25 over an wider amplitude and offset range?

Maybe we can design an amplifier that can be connected to the pattern generator port and be controlled by the Goltek software.
Hows that?

Mechatrommer:

--- Quote from: RJSC on December 04, 2011, 11:53:31 pm ---but I understand that with the GolTek software, the jitter and sync issues are resolved, right?

--- End quote ---
synch issue solved, with limitation (freq res/step). jitter? no, its inherent in fpga dds hardware.


--- Quote from: RJSC on December 04, 2011, 11:53:31 pm ---Has anyone designed an amplifier so that we can use the DDS 3X25 over an wider amplitude and offset range?

--- End quote ---
if you have a taste for it, you may ask me for schematics... http://soasystem.com/eng/goltek/amplifier.htm its just normal 3-5X gain opamp using ths3095


--- Quote from: RJSC on December 04, 2011, 11:53:31 pm ---Maybe we can design an amplifier that can be connected to the pattern generator port and be controlled by the Goltek software.

--- End quote ---
already has, in the dds3x25 hardware. whats the point building what you already have? the only sensible to me is for digital generator (bus, spi or such). but i have a hardtime finding time for sw dev for it sorry :P

Amerlock:
Hello everyone,

First off I would like to say what a great Forum. Now a little about myself.. I am doing a double major in Engineering (computer and Electronic).. And I have decided to build my own lab at home so that I may be close to my kids while I am doing my homework.

Anyways, within the last couple of weeks I have purchased all of my equipment and everything seems to work fine except the DDS 3x25.. I have realized that we cannot regulate the impedance. The equipment at school lets us put a HIGH Z function on route for the impedance control. And it is too late for me to return my function generator. So my question is this..

Would it be possible for you to incorporate a similar HIGH Z function into your Goltek program?  And if not could someone recomend some way of getting around this problem with the DDS 3x25. If I cannot find a solution for this I might as well resell this piece of equipment because it will be useless to me and find another one that suits more my needs..

Thanks for any help..

alm:

--- Quote from: Amerlock on January 14, 2012, 06:57:14 am ---Anyways, within the last couple of weeks I have purchased all of my equipment and everything seems to work fine except the DDS 3x25.. I have realized that we cannot regulate the impedance. The equipment at school lets us put a HIGH Z function on route for the impedance control. And it is too late for me to return my function generator.

--- End quote ---
Did that actually change the output impedance, or did it just scale the displayed voltages to be correct for an unloaded output, like most of the function generators? I find it hard to understand how this can be a critical feature, didn't they teach Ohm's law in school?

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