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DSO: How to read max. voltage specs?

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Someone:

--- Quote from: Aldo22 on August 29, 2024, 02:34:49 pm ---On the front, it says "300V CAT II".
The manual says: "300VRMS (10X)".

What does that mean? 10x?
In other words, can I put 230V mains on the BNCs without breaking it?
It can't measure that anyway with max. 10V/div.
--- End quote ---
Read the manual, that is one of the mandatory steps in making safe measurements. What is printed on the casing is only a reminder and may be for some specific configuration such as with the supplied probes attached.

KungFuJosh:
+1 for being careful with Vrms. Neither the Rigol nor Siglent want to see peak voltages above 400V.

The "scope" that says "300V (10X)" likely means that the "scope" itself can't go above 30V, but they want to pretend they're cool like the big kids. 😉

Aldo22:

--- Quote from: KungFuJosh on August 29, 2024, 11:08:31 pm ---The "scope" that says "300V (10X)" likely means that the "scope" itself can't go above 30V,

--- End quote ---

Thank you.
In principle, even the pessimistic interpretation does not limit what I can practically measure.
30Vrms sine (x1) is still 85Vpp, so it fills the scale (8x10V/Div).
It's really all about the safety margin.

The only problematic (real life) scenario I can imagine for my purposes is if I tried to measure ripple on a 60V PSU (1x, AC coupling, max. 42Vpk).

Would that be a real problem (in the pessimistic interpretation)?

tautech:

--- Quote from: Aldo22 on August 30, 2024, 08:22:06 am ---
--- Quote from: KungFuJosh on August 29, 2024, 11:08:31 pm ---The "scope" that says "300V (10X)" likely means that the "scope" itself can't go above 30V,

--- End quote ---

Thank you.
In principle, even the pessimistic interpretation does not limit what I can practically measure.
30Vrms sine (x1) is still 85Vpp, so it fills the scale (8x10V/Div).
It's really all about the safety margin.

--- End quote ---
Until you forget the probe is still set to 1x.  :scared:

Aldo22:

--- Quote from: tautech on August 30, 2024, 08:37:45 am ---Until you forget the probe is still set to 1x.  :scared:

--- End quote ---

This thread wasn't really about probes, it was about the maximum voltage on the input (BNC).
It's not really a problem for me as I never actually go above 30VDC or 25Vpp.
Even the 60VDC question was rather hypothetical for me.

But yes, more safety margin is certainly better.
Knowing the limits of the device is important in any case.

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