Electronics > Beginners

Digital Oscilloscope Maximum Input Voltage

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Damianos:
Additionally on what tautech says:
- the devices that are to be used on 220/230/240 Volt mains have a typical upper limit on 265VAC, that is the plus 10% of 240VAC. The lower limit, for proper operation, is around 198V.
- the horizontal "dancing" of the signal is just one pixel. Decreasing the time base, you can see that the line is not exactly vertical, so the instrument places the signal one time to one pixel and the other to the next one...

mike_mike:
Hello,
I have a UTD2025CL DSO.
I was checking if there are oscillations on the output of a TL431 regulator and I got the attached screenshots.
It is normal to appear "multiple" wave forms on the same channel as in the image attached (MAP003 and MAP002) ?
The oscilloscope was set to AC coupling. The other settings can be read from the screenshots.

vk6zgo:

--- Quote from: mike_mike on September 03, 2019, 05:20:07 am ---Hello,
I have a UTD2025CL DSO.
I was checking if there are oscillations on the output of a TL431 regulator and I got the attached screenshots.
It is normal to appear "multiple" wave forms on the same channel as in the image attached (MAP003 and MAP002) ?
The oscilloscope was set to AC coupling. The other settings can be read from the screenshots.

--- End quote ---

Yes!
If you look at the display at 10ms/ div, you see effectively a 100Hz waveform, as would be expected from a linear supply operated from 50Hz Mains.
The "furry" stuff riding upon it is the high frequency stuff you see at shorter time/ div settings.

It is not unusual for a complex signal to look very different at widely different time/ div settings.

For instance, MAP002 is just MAP001 "zoomed in"

radiolistener:

--- Quote from: mike_mike on September 03, 2019, 05:20:07 am ---It is normal to appear "multiple" wave forms on the same channel as in the image attached (MAP003 and MAP002) ?

--- End quote ---

yes, it is normal. On first scan it has one waveform, on second scan it has another waveform, etc.

mike_mike:
In the attached screenshot, the trace is a little bit lower than the mark on the screen for CH1. Why is this happening ? It is normal ? It has some relationship to the separation of the AC from DC signal ?
The signal source is the same TL431 power supply as mentioned above.

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