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| Review: Hantek DDS 3X25. Anyone own one? |
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| alm:
--- Quote from: saturation on February 10, 2011, 10:07:18 pm ---One advantage of USB scopes is that the raw data can be imported into software for presentation in any format, such as Bode plots. --- End quote --- Just to be clear: this is true for any DSO with any kind of PC connectivity, which includes all of the popular Rigol/Instek/Hantek/Tekway scopes. Even RS-232 or GPIB would work. When I think of USB scopes, I think of a small box with BNC connectors and a USB port (like the Hantek AFG), without any display or knobs. You definitely don't need one of those, you can do the same with a standard DSO with USB port and decent software, and they're usually inferior to stand-alone units unless you pay big bucks to someone like NI or Agilent. You can actually do the same with a non-storage scope, but you need to manually measure the amplitude at all frequencies, so it's a lot of work. With a computer controlled signal source and oscilloscope, you can automate it. |
| saturation:
Hantek's web site has been down for a while, but its up and all its operational software are online to be downloaded for trial as you please. http://www.hantek.com.cn/english/produce.asp?classid=30 However, there is something wrong with the 3x25 rar file, its 22MB long but when unrared only drivers are viewable. I've sampled a few of the other products and the packages are OK. Alm is right of course, what I meant was USB interfaced scopes. Software to make plots of multiple complex data sets is unlikely to be included as part of a Rigol type DSO package; but student oriented knob&button free USB scopes like syscomp or Velleman will come with a bode plotter and some other tools. Software that can make bode plots and more, using any scope data so long as drivers exists, are Labview or Mathlab; 2 industry standards. However, you may need to program it whereas on Velleman and syscomp its a built in routine tied to their hardware. However, if you are going to be a professional EE, chances are Labview or Mathlab is in you career future, so its good to get familar with them. For students, Labview can be had for $22, its almost the same packages as Labview base which is priced for professionals at over $1500. If you need to start with plotting now, you can download a trial package until you get your license. http://www.ni.com/labviewse/labviewse_faq.htm --- Quote from: alm on February 10, 2011, 11:13:10 pm --- --- Quote from: saturation on February 10, 2011, 10:07:18 pm ---One advantage of USB scopes is that the raw data can be imported into software for presentation in any format, such as Bode plots. --- End quote --- Just to be clear: this is true for any DSO with any kind of PC connectivity, which includes all of the popular Rigol/Instek/Hantek/Tekway scopes. Even RS-232 or GPIB would work. When I think of USB scopes, I think of a small box with BNC connectors and a USB port (like the Hantek AFG), without any display or knobs. You definitely don't need one of those, you can do the same with a standard DSO with USB port and decent software, and they're usually inferior to stand-alone units unless you pay big bucks to someone like NI or Agilent. You can actually do the same with a non-storage scope, but you need to manually measure the amplitude at all frequencies, so it's a lot of work. With a computer controlled signal source and oscilloscope, you can automate it. --- End quote --- |
| alm:
Yeah, you might have to do some basic programming in something like a free MATLAB clone, probably not a bad skill for an EE. There's also software like SignalExpress, which is a nicer shell around Labview (and less powerful, obviously). Should be fine for things like bode plots and FFT. But since it's professional software from NI, it's likely expensive. |
| Mechatrommer:
--- Quote from: saturation on February 10, 2011, 09:51:07 pm ---LARGE Hi res PCB photos are here, I did not take them, just found it by accident: http://biot.com/p/ --- End quote --- nice simplistic porn photos. i'm looking forward to take apart my unit. i just wonder why there is so much pcb area (bottom part) compared to components population (about a quarter only), why dont/cant they make the unit/pcb smaller? ??? --- Quote from: frogblender on February 09, 2011, 04:02:08 pm ---I also bought a Hantek DSO5202B 200MHz scope, which is not bad at all for the price. Although this is off-topic, I had a wild dream about using the generator and scope together as a Network analyzer (would give me a nice graph of amplitude and phase response as a function of freq for my device-under-test) - anyone have any ideas how to do this? I also have this scope-and-generator-in-one: http://syscompdesign.com/CGR101.html which produces beautiful bode plots - but only up to 2MHz - I need something up to 10MHz. Any ideas? --- End quote --- --- Quote from: saturation on February 10, 2011, 10:07:18 pm ---Good you brought these up: You can use a signal source and a scope in the X-Y mode of the scope, and evaluate Lissajou patterns. It will provide phase, amplitude and frequency relationship between 2 channels. One advantage of USB scopes is that the raw data can be imported into software for presentation in any format, such as Bode plots. But if you were trying to test your hardware for its frequency and phase response for practical reasons, you now have basic tools to make that assessment. For example, the syscomp image would appear as a very squashed line at 12kHz in phase, then a turn to equal proportions at X=Y amplitude, and begin to move from a circle to an ellipse as the phase shifted. http://en.wikipedia.org/wiki/Lissajou#Practical_application --- End quote --- frogblender's point interests me about the network analyzer, and the possiblity to bode/lissajou plot etc in pc software. but i'm concern about the delay that will be introduced by pc->generator->output and input->oscilloscope->pc with the DUT in between. will it not give some effect to the graph plot or analysis? i need to study more on this. |
| Bored@Work:
--- Quote from: Mechatrommer on February 11, 2011, 03:26:53 am ---i just wonder why there is so much pcb area (bottom part) compared to components population (about a quarter only), why dont/cant they make the unit/pcb smaller? ??? --- End quote --- Either they had an abundance of the enclosures (they use it for other products, too), or they just want to impress. |
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