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Review: Hantek DDS 3X25. Anyone own one?

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torch:

--- Quote from: saturation on December 16, 2012, 03:08:09 pm ---maybe the g in the name 1025G is for Goltek 

--- End quote ---

It should be for Goltek. However, I think it stands for "Gone" -- as in: "Were did the other 3 BNC jacks go? They're Gone."

Mechatrommer:

--- Quote from: torch on December 17, 2012, 12:39:55 am ---
--- Quote from: saturation on December 16, 2012, 03:08:09 pm ---maybe the g in the name 1025G is for Goltek 

--- End quote ---
It should be for Goltek. However, I think it stands for "Gone" -- as in: "Were did the other 3 BNC jacks go? They're Gone."

--- End quote ---
its even match my 10x25 amplifier name... http://www.soasystem.com/eng/goltek/amplifier.htm i should file a "trademark name infringement" 8) but their 1025 still use ±3V, bugger! so i vote "G" is for buGger. i dont believe its for Goltek since Rigol name is embedded in it and i dont believe they are both friend.

zibadun:
edit: added DDSDownload times: I almost fell asleep scanning a 30 MHz range with a 50khZ step.  that DDSDownload call takes forever  :=\  :=\     Anybody figured out how to make a faster frequency change? 

freq pts periods elapsed time (secs)
1000000 4000 20 0.509
1052631 3990 21 0.509
1104972 3982 22 0.512
1156069 3979 23 0.509
1204819 3984 24 0.510
1250000 4000 25 0.508
1307189 3978 26 0.510
1351351 3996 27 0.509
1408450 3976 28 0.510
1459854 3973 29 0.510
1503759 3990 30 0.524
1550387 3999 31 0.509
1600000 4000 32 0.509
1652892 3993 33 0.509
1709401 4095 35 0.518
1754385 3990 35 0.509
1801801 3996 36 0.509
1851851 3996 37 0.509
1904761 4095 39 0.517
1960784 4080 40 0.517

Is this a normal  delay or am I doing something wrong?   At this rate it takes five minutes to do a 30mhz sweep

marmad:

--- Quote from: zibadun on December 17, 2012, 06:04:10 am ---edit: added DDSDownload times: I almost fell asleep scanning a 30 MHz range with a 50khZ step.  that DDSDownload call takes forever  :=\  :=\     Anybody figured out how to make a faster frequency change?
--- End quote ---
Look at this old post of mine. I think it explains what you're looking for - and can point you in the right direction. Let me know if you need more.

Edit: This post might help you as well.

zibadun:

--- Quote from: marmad on December 17, 2012, 03:06:55 pm ---
Look at this old post of mine. I think it explains what you're looking for - and can point you in the right direction. Let me know if you need more.

Edit: This post might help you as well.

--- End quote ---

Thanks, I think I understand the formulas and arithmetic behind them. But  I don't see how I can avoid downloading a new waveform every time I need to change the frequency.  Even if I'm just changing the number of points with the same wave buffer don't I still need to call DDSDownload?   It seems transfering of the buffer takes up most time.   May be I will try with the minimum number of points and periods that will give the desired frequency and save on the transfer time a bit.

I guess an easier question to ask is  - can *any* software that was developed so far do a 600 step sweep starting at 1 mhz, lets say, in under a minute?  No constrains on the frequency or glitch free sweep, as long as steps are more or less evenly spaced. 

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