Products > Test Equipment

Is CAT II a useful rating for a multimeter?

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EEVblog:
APPA S3 2kV: https://www.avo.co.nz/products/low-voltage-and-contractor-tools/digital-multimeters/1439-appa-s3

madires:
1500 V AC/2000 V DC: BENNING MM 10-PV (https://www.benning.de/products-en/testing-measuring-and-safety-equipment/digital-multimeter/pv-multimeter-mm-10-pv.html). Looks very similar to the APPA S3 2kV.

joeqsmith:

--- Quote from: Fungus on April 26, 2023, 08:41:54 am ---The is a branch from another topic where I was wondering if "CAT II" is a useful safety marking.
...

--- End quote ---

Fault currents change which I would assume drive up the cost of safety fuses and other materials.   I wouldn't be surprised that the costs for certification are not higher as well.   I'm sure the ignorant will chime in with how testing should not cost much and fuses are free. 

Neilm:
IEC61010-2-33 is the part for multimeters. it states that meters must be rated for 300 V CAT III at a minimum.

switchabl:
Well, Part 2-033 applies to "hand held meters that have a primary purpose of measuring voltage on a live mains circuit". That is more or less CAT III (or IV) by definition. A lower-rated one (or a bench multimeter) would just fall under Part 2-030 instead.

An example is the Uni-T UT131 series: https://www.triopak.fi/files/product/UNI-T/UT131%20Series%20CE-LVD.pdf

But electricians won't buy something like this and they probably make up most of the (serious) multimeter market. So it doesn't make much sense as a product unless it is very low-cost. Or a specialized meter for the electronics market (most bench meters are CAT II).

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