Products > Test Equipment

DSO: How to read max. voltage specs?

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pdenisowski:

--- Quote from: Fungus on August 30, 2024, 02:13:48 pm ---Input impedance is probably 1M Ohm so 300V isn't likely to damage it - it's less than 1mA of current.

--- End quote ---

Although the warnings about 1X vs 10X probes are very valid, there is an even larger danger if you accidentally leave the input impedance on 50 ohms vs 1 megaohm (“Hi-Z”).

I sometimes (half-seriously) wonder if the reason why most “hobbyist” scopes don’t have a 50 ohm input option is because it’s safer for new / casual scope users.

Grandchuck:
Less than or equal to 5 volts for 50 ohm input.  Is that true for most or all oscilloscopes?

Aldo22:

--- Quote from: pdenisowski on August 30, 2024, 05:02:14 pm ---
--- Quote from: Fungus on August 30, 2024, 02:13:48 pm ---Input impedance is probably 1M Ohm so 300V isn't likely to damage it - it's less than 1mA of current.

--- End quote ---

Although the warnings about 1X vs 10X probes are very valid, there is an even larger danger if you accidentally leave the input impedance on 50 ohms vs 1 megaohm (“Hi-Z”).

I sometimes (half-seriously) wonder if the reason why most “hobbyist” scopes don’t have a 50 ohm input option is because it’s safer for new / casual scope users.

--- End quote ---

That's right, there is no such option on the DSO2000.

Fungus:

--- Quote from: pdenisowski on August 30, 2024, 05:02:14 pm ---I sometimes (half-seriously) wonder if the reason why most “hobbyist” scopes don’t have a 50 ohm input option is because it’s safer for new / casual scope users.

--- End quote ---

Could be... :D

Maybe they tried it, got a lot of returns "under warranty" and said "never again!"

pdenisowski:

--- Quote from: Grandchuck on August 30, 2024, 05:16:52 pm ---Less than or equal to 5 volts for 50 ohm input.  Is that true for most or all oscilloscopes?

--- End quote ---

In my experience, 5 volts is the "typical" max input voltage for a scope channel with its impedance set to 50 ohms.

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