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| Shopping for used scope to use as curve tracer |
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| bdunham7:
Try taking the scope out of XY mode and just show CH1 and CH2. You should be able to get the 60Hz applied voltage signal on CH1 and then the DUT current on CH2. You may have to use very different voltage settings to get good signals. Once you have stable individual signals, go for the XY. |
| CatalinaWOW:
For best results as a curve tracer on an analog scope, don't just look for XY mode, but make sure it has Z axis, external beam intensity control or other method to turn the beam off during retrace intervals. Not all do. My old Heathkit was one example. The same concept would apply on a DSO. How desperately you need this depends on the details of how your curve tracer works. Some may just step back down to zero and the only issue will be a possible bit of hysteresis. Others jump directly from the end of one track to the next and this can be a visual pain. Possible to ignore but not desirable. |
| Electron123:
>Try taking the scope out of XY mode and just show CH1 and CH2. Hmmm. Is this is what I'm supposed to be getting? |
| bdunham7:
--- Quote from: CatalinaWOW on August 26, 2022, 12:29:41 am ---For best results as a curve tracer on an analog scope, don't just look for XY mode, but make sure it has Z axis, external beam intensity control or other method to turn the beam off during retrace intervals. Not all do. My old Heathkit was one example. The same concept would apply on a DSO. --- End quote --- I've seen this mentioned a few times, but typically a basic curve tracer doesn't use any blanking and for many components the retrace will be pretty much overlaid on the forward trace. For switches like triacs and so forth the retrace will be separate, but they don't blank it--the octopus and other basic curve tracers don't have any output which could be used for the Z-axis. Even full-featured all-in-one-box curve tracers only use CRT intensity modulation in certain modes. |
| bdunham7:
--- Quote from: Electron123 on August 26, 2022, 12:32:27 am --->Try taking the scope out of XY mode and just show CH1 and CH2. Hmmm. Is this is what I'm supposed to be getting? --- End quote --- That needs some adjustment! Change the settings until you get 1-2 cycles on the screen horizontally and both channels are about 3-4 divisions high. Turn the BW limit on and reduce your memory depth. Perhaps change your probes and scope to 1X, that signal looks really weak and noisy. What is your tracer circuit like? |
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