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| Analog vs digital X-Y mode |
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| JohnnyMalaria:
I have to monitor an I-Q pair of a demodulated signal while the signals are also being captured. My Rigol DSO is great for Y-T plots and I love the compact size and weight. But the X-Y function absolutely sucks (the FFT isn't all that great, either.) I use my 1974 vintage Tektronix dual 100MHz just for the X-Y plots and they are gorgeous. I can tell what's going right/wrong with my instrument. With both 'scopes, I get to look at 6 signals which happens to be how many I have :) |
| Scratch.HTF:
Despite the retrace lines on the digital scope, it still looks impressive. |
| vk6zgo:
--- Quote from: Miti on March 22, 2018, 02:17:52 am ---Just for fun, I guess no digital can beat an analog scope at X-Y. --- End quote --- Interesting that the old "tedious"210 does better than the much more capable DS1054Z. |
| ataradov:
--- Quote from: vk6zgo on April 28, 2018, 07:41:55 am ---Interesting that the old "tedious"210 does better than the much more capable DS1054Z. --- End quote --- 210 has a horribly slow display, so it probably contributes quite a bit to the "analog" feel. But it seem like DS1054Z does not even attempt to blank the transitions, so may be some configuration of intensity will improve things. |
| JohnnyMalaria:
Hopefully the linked videos will convince the nay-sayers that analog X-Y rocks :) (They are too big to attach. The links are to OneDrive). https://1drv.ms/v/s!AhmR5if7W0HCjcJG8SPwrOfTWF-grg https://1drv.ms/f/s!AhmR5if7W0HCjcJFalJzpym6hx4C_A A bit of description is probably necessary. There are two videos of a real/imaginary pair of signals from a photodetector (after demodulation) for light scattered by electrically charged nanoparticles moving in a liquid. A laser illuminates the sample. The first video shows just random Brownian motion from the particles. In the second video, an electrical field is turned on and off every five seconds or so. When it is on, the nanoparticles move toward the electrode of opposite charge. Movement of the particles causes a Doppler shift of the laser light. The X-Y trace indicates the amplitude and the optical phase difference of the light. The phase is proportional to the position of the particles. When the field is on, you can see "circles". One complete circle is one hertz. In terms of position, it is approximately 1 micron. The frequency of the circles is a perhaps 5 to 10Hz. That's a change of 5 to 10 parts in 100 trillion. Rock on, 48-year old 475 scope!!! (Sorry the videos are upside and grainy). |
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