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| Gw Instek GDS2204E (200MHz 4 channel DSO) review |
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| Mortymore:
--- Quote from: nctnico on January 30, 2019, 07:01:36 pm ---You should be able to do this if you have a generator which can step through a range of frequencies with a certain dwell time. Most RF generators support this. --- End quote --- Are you referring to something old school with sweep mode and trigger from a generator? That actually works a bit better than I recall of my analog scope, with this digital 2000E, if the display is set to infinite persistence, because it will keep painting the screen, but that's to basic and calculation tedious comparing to the neat Bode plot of the Siglent scope (for instance). Just for fun, placed a simple RC low pass filter on a bredboard with a cut-off frequency of 4KHz. The generator 1032X sweeps from 10Hz to 100KHz on CH1, and on CH2 outputs a square wave of 1Hz, for triggering the scope on CH2. Made 3 screen captures, one with a linear sweep, and the other 2 with logarithmic sweep, and the persistence in the last one was set to infinite, so after a minute or so the area to plot is filled. The vertical position on CH1 on the scope was deliberately set so roughly only the positive half of the wave is shown on screen... Bode plot alike. This is just a "poor man" Bode plot. :'( PS: installed the FRA APP but it kicks me off right from the start, stating that I don't have a generator in my scope, so I can't even take a look at it. Uninstalled the APP, since was of no use for me. A side note: I came from a long "dark age" in electronic equipment and only recently acquired a decent digital scope and generator with some bells and whistles that many of you master here. Be forgiven if I say something idiot or don't quite get the picture here and there. |
| nctnico:
--- Quote from: Mortymore on January 30, 2019, 10:36:18 pm --- --- Quote from: nctnico on January 30, 2019, 07:01:36 pm ---You should be able to do this if you have a generator which can step through a range of frequencies with a certain dwell time. Most RF generators support this. --- End quote --- Are you referring to something old school with seep mode and trigger from a generator? --- End quote --- No, use the SA mode in peak hold mode (which can be set to averaging). |
| Mortymore:
Having played a bit with the Spectrum Analiser option, after "re-upgrading" my 2074E from 200 to 300MHz, found that the higher frequency that can be set is 750MHz, but the span remains the 500MHz (so it has to start at 250MHz). Though it may seem a nice feature having the ability to shift the frequency range 250MHz up, it actually has no use since there's nothing shown in the display above 500MHz (see picture attached: GW2000E_SA_750MHz.PNG). Am I doing doing something wrong? Is that a bug? Or am I missing some useful point for this to be like it is? Something that I find annoying with this scope is the "supra imposed windows", like with the feature "statistics" or a "table". Seems that Rigol and Siglent (series 1000) manage to re-arrange the windows so things fit or having some degree of transparency, don't block much the signal to be viewed. GW just place a opaque board, blocking everything (GW2000E_SA_Table.PNG). :-- Even in the XY mode were half of the screen is empty, the window for statistics has to fell on top of what you are trying to see (GW2000E_XY_statistics.PNG). :wtf: Just for comparison, attached 2 random images that can be found on this forum, posted by other members (hope they don't mind) from a Rigol and a Siglent (series 1000). I think they serve the purpose to show a better arrangement than in the GW2000E scope. Even harder to get is the fact that the GW has an 8" screen and the other scopes on comparison are 7" (though with the same resolution), besides the fact that the Rigol has the icons associated to the side buttons always visible, stealing screen area. I believe there's some margin for improvement in the GW UI. But by all means, correct me if I'm wrong. I love this scope, but I'd like it to be as prefect as possible. ::) |
| nctnico:
GW Instek could improve the screen layout but then again the fonts used by Rigol and Siglent are much smaller which may affect readability. BTW if you look at the SA screen you'll see it stops measuring at 500MHz. |
| Mortymore:
--- Quote from: nctnico on March 31, 2019, 12:43:26 pm ---GW Instek could improve the screen layout but then again the fonts used by Rigol and Siglent are much smaller which may affect readability. --- End quote --- Yes, the fonts in GW look written in Bold format. Good for those like me that start to need glasses to read. But even then, cases like the screen in XY mode could have better display placement, some windows without border, some transparency or unnecessarily big size of the window. Cases that only a line of data is represented on a table, and the windows fills most of the screen. Well, maybe it's just me being picky, but i like to see data side by side with an image to get a better interpretation of graph vs data. Even an HP39GS graphing calculator has similar feature. --- Quote from: nctnico on March 31, 2019, 12:43:26 pm ---BTW if you look at the SA screen you'll see it stops measuring at 500MHz. --- End quote --- That's exactly my point. What's the purpose of extending the SA up to 750MHz if it's useless above 500MHz? I would call it a bug. Reminds me a speedometer with a scale up to 220Km/h in a car that only reaches 160. >:D |
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