Products > Test Equipment

DSO: How to read max. voltage specs?

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Fungus:

--- Quote from: Aldo22 on August 30, 2024, 11:16:34 am ---For example, one may wonder why the Rigol and Hantek specifications are in Vrms. Actually, Vpk would be less misleading, wouldn't it?
Is that just because people compare it with mains voltage?

--- End quote ---

The people most likely to abuse it are, um, "newbies" so VRMS is best because it's a smaller number.

pdenisowski:

--- Quote from: Aldo22 on August 30, 2024, 11:16:34 am ---Is it possible for the manufacturer to print "300V CAT II" on the device if it only applies with the 10x probes?

--- End quote ---

As a practical matter, it’s really the probes that determine the safety more than the channel inputs. Most top tier scope manufacturers (including R&S) don’t indicate or specify CAT ratings for channel inputs.  For us, the only exception is our RTH handheld scope since one of its target markets is very high voltage (CAT III/IV) measurements.  Quality single-ended probes and most differential probes will have CAT ratings printed on them.

It’s worth noting that the IEC specifies CAT ratings but does not verify compliance. There are some (mostly DMM) manufacturers who “design to” a rating but never have their device tested by a third party like UL, CSA, TÜV, etc. 

Someone:

--- Quote from: pdenisowski on August 30, 2024, 11:09:43 am ---
--- Quote from: Fungus on August 29, 2024, 02:59:31 pm ---If it says "300V CAT II" on the front then it should withstand 300V RMS at the BNC.
--- End quote ---
According to the IEC, if it says “CAT II, 300V” it should withstand a transient of up to 2500V.
--- End quote ---
But no guarantees if it will still function afterward ;) so many different "ratings".

Someone:

--- Quote from: Aldo22 on August 30, 2024, 11:16:34 am ---Is it possible for the manufacturer to print "300V CAT II" on the device if it only applies with the 10x probes?
--- End quote ---
Yes, you need to read the manual.

Instruments are not self documenting.

Aldo22:

--- Quote from: pdenisowski on August 30, 2024, 11:09:43 am ---According to the IEC, if it says “CAT II, 300V” it should withstand a transient of up to 2500V.

--- End quote ---

Thanks.

To be honest, I'm not really interested in transients here.
I simply wonder whether Hantek can be so bold as to write 300V next to connections that can only handle 30V.

I mean, it's "only" Hantek, but they've been selling their devices worldwide for a few years now.

Would they risk a lawsuit just for the fun of printing BS specifications on the device?

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