EEVblog Electronics Community Forum

Products => Test Equipment => Topic started by: Medo on July 15, 2018, 06:38:26 pm

Title: Cat II rating for EEVBlog 121GW
Post by: Medo on July 15, 2018, 06:38:26 pm

I don't see Cat II rating for EEVBlog 121GW multimeter. Is Cat II rating even available for it?

I know that extrapolating Cat IV based on derating Cat III is a big no-no. How about going to Cat II? Can it be assumed that any Cat III 600V device can handle Cat II 1000V or that assumption is booogus? :)

Title: Re: Cat II rating for EEVBlog 121GW
Post by: lypse on July 15, 2018, 08:32:20 pm

Datasheet mentions Voltage range up to 600V, I would not use it on 1kV.

And what normal applicance would have that high voltage? Old monitors?

Title: Re: Cat II rating for EEVBlog 121GW
Post by: Fungus on July 15, 2018, 09:26:09 pm

Quote from: Medo on July 15, 2018, 06:38:26 pm

I know that extrapolating Cat IV based on derating Cat III is a big no-no.

Not true.

Quote from: Medo on July 15, 2018, 06:38:26 pm

How about going to Cat II? Can it be assumed that any Cat III 600V device can handle Cat II 1000V or that assumption is booogus? :)

The trick is to not to raise the voltage.

A 600V rated multimeter cannot be used on 1000V, even if it's a lower CAT 1000V.

A 600V CAT III multimeter could be a 300V CAT IV multimeter though.
(https://www.eevblog.com/forum/testgear/cat-ii-rating-for-eevblog-121gw/?action=dlattach;attach=477269;image)