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DSO: How to read max. voltage specs?

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Performa01:

--- Quote from: minhtri0405 on November 27, 2024, 07:40:59 am ---I have a pretty old OSC SDS1072CNL, but I just recently had a chance to use it. And like you I wondered if the 400Vpp written in the OSC specs is the maximum voltage applied to the OSC's BNC connector???. After reading many posts on eevblog and other sites I asked siglent and they said "yes", I illustrated with pictures to make sure I didn't misunderstand. Siglent confirmed that 400Vpp is the voltage at the BNC connector. Hope they don't exaggerate too much.

--- End quote ---

No, they certainly don't exaggerate at all. The 400 V limit is primarily related to the power handling limit of the input resistors (400 V causes already 160 mW dissipation in 1 megohm), as well as the max. voltage rating of the resistors and - depending on the particular design of the input buffer - maybe the max. voltage rating oc the AC input coupling capacitor. Of course, distances of "hot" traces to other conductive areas are of importance too.

I can't show an application with 400 V right now, but happen to have a demonstration, where I measured 205 V DC with better than 0.1% accuracy using a somewhat more modern Siglent SDS1104X-E DSO. The 205 V were connected directly to the scope input, see attached screenshot in reply #8 of the following thread:

https://www.eevblog.com/forum/testgear/are-scopes-expected-to-be-highly-accurate-on-dc-measurements/msg2144416/#msg2144416

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