Products > Test Equipment
DSO: How to read max. voltage specs?
newbrain:
--- Quote from: Aldo22 on August 30, 2024, 08:47:08 am ---It's not really a problem for me as I never actually go above 30VDC or 25Vpp.
--- End quote ---
Remember also that the stated limits are for low frequencies.
Siglent correctly put a 10 kHz limitation on the quoted figures.
Front-end derating at radio frequency (even at short-wave levels) has 'burnt' more than one young player.
See, e.g., https://www.tek.com/en/support/faqs/what-are-maximum-voltage-limits-tds-oscilloscopes-and-how-do-limits-change-over-frequen
tautech:
--- Quote from: Aldo22 on August 30, 2024, 08:47:08 am ---
--- 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.
--- End quote ---
Partially.
Your limits and the limits of your probes are most important.
With the correct probe you can measure most anything safely.
Gone are the days when we floated a scope as differential probes are cheap and readily obtainable now whereas that practice was downright dangerous despite the fact that many of us did it. :palm:
Fungus:
--- Quote from: tautech on August 30, 2024, 08:37:45 am ---Until you forget the probe is still set to 1x. :scared:
--- End quote ---
Or if you have children/visitors and they like to play with the little switch.
I still think the most sensible thing I ever saw in a 'scope is that Micsig supplies fixed 10x probes with theirs.
pdenisowski:
--- 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.
Aldo22:
Thank you for all your contributions.
You can of course fill books about probes, safety, high frequency etc. but my question is really very limited.
I just want to know how to basically interpret the max voltage specs.
Or rather, I want to make sure that I am reading them correctly.
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?
Can one safely deduce from this that e.g.
30Vrms -> 42.5Vpk?
Does 42.5Vpk correspond to the maximum DC voltage, or is there something else to consider?
Is it possible for the manufacturer to print "300V CAT II" on the device if it only applies with the 10x probes?
Wouldn't that be grossly negligent, or does this happen more often?
Is this even allowed to be sold in the EU if it only applies under this restriction?
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