Which Multimeter is More Accurate: ±1%+2 or ±2.5%+2?

[nothing909]

Homework Statement

Which multimeter is more accurate?

Homework Equations

The Attempt at a Solution

Which multimeter is more accurate, one that is ±1%+2 or one that is ±2.5%+2

I don't know how to read it, is it the higher percentage one that's more accurate or the lower percentage one?
I think it's the lower percentage one but I'm not too sure.

Also, what does the +2 mean? Does that make much of a difference?

 

[Mark44]

Homework Statement

Which multimeter is more accurate?

Homework Equations

The Attempt at a Solution

Which multimeter is more accurate, one that is ±1%+2 or one that is ±2.5%+2

I don't know how to read it, is it the higher percentage one that's more accurate or the lower percentage one?
I think it's the lower percentage one but I'm not too sure.

Lower would be more accurate.

Also, what does the +2 mean? Does that make much of a difference?

I don't know what the +2 means, either. Where did you see this? Can you post a link or a picture?

 

[nothing909]

Here

 

[nsaspook]

"Accuracy may also include a specified amount of digits (counts) added to the basic accuracy rating. For example, an accuracy of ±(2%+2) means that a reading of 100.0 V on the multimeter can be from 97.8 V to 102.2 V. Use of a DMM with higher accuracy allows a great number of applications."

http://en-us.fluke.com/training/tra...lution-range-counts-digits-and-precision.html

 

[Mark44]

The explanation isn't very clear, and I think they might have a typo. If the actual voltage is 100 V, an error of +/- 1% would give a range of indicated values between 99.0 V and 101.0 V. The + 2 has to do with the least significant digit being off by 2. They go on to say it could be as low as 99.8 V or as high as 101.2 V. I believe the low value should be 98.8 V, not 99.8 V.

 

[nothing909]

The explanation isn't very clear, and I think they might have a typo. If the actual voltage is 100 V, an error of +/- 1% would give a range of indicated values between 99.0 V and 101.0 V. The + 2 has to do with the least significant digit being off by 2. They go on to say it could be as low as 99.8 V or as high as 101.2 V. I believe the low value should be 98.8 V, not 99.8 V.

Yea, I notice that now, that's why I was so confused. I couldn't find a clear explanation online so I came here. Thanks for clearing it up.

 

[Mark44]

My comment is consistent with the link that nsaspook provided. (Look on the tab with Accuracy.)