Fluke Electrician's Multimeter - Most models performance at Ohms range

[Kiriakos GR]

This is a fresh topic aiming to enlighten the ones expecting best measuring precision at Ohms range.

My only FLUKE branded HH DMM, this is now the CNX 3000 (Part of wireless industrial DMM Kit).
By using it Ohms range as a test, and by connecting it at my 8846A mA inputs, I did note precise delivery of typical short circuit current per Ohms range.

There was a time, that FLUKE corporation this were delivering actual data of typical short circuit current per Ohms range.
Examples: 600 Ohm, 6K, 60K, 600K, 6M, 60M. 

By looking several fresher FLUKE datasheets, I did discover of how much precision FLUKE offers per class of handheld DMM.
Low Class = 114, 115, 117   at  600 Ohm = 0.9 % + 2

Medium Class = CNX 3000, FC 3000, Fluke 174  at  600 Ohm = 0.5 % + 2

High Class = 87V Max / 28II at  600 Ohm = 0.2 % + 2 (When using the rel function to compensate for offsets.)

While the 8846A that is a bench-top factory  , at 10 Ohms, 100 Ohms, 1K Ohm range this deliver 0.01 % + 0.001

Why this topic is here anyway?
Well its one reminder, this delivering a few major hints.
a) If you are trying to measure a precision resistor by one economy HH DMM, you will never measure accurately.
If your resistor this is at 1% tolerance, and your DMM has 1% not tight (range) tolerance, your measurement can be off by 2%

b) An better handheld DMM this will reduce measurement error up to a point.

c) There is no handheld DMM this able to perform Low Ohms and accurate measurement.

In conclusion, if the list of your applications includes troubleshooting of electronics, these made by high precision components, then the choice of the DMM model, this is also critical for you.
Especially when you are up to, making a choice between FLUKE HH DMM models.

Note: About me, I am going to explore a little more, the Ohms range Source Current specifications.
As it appears that FLUKE this using Source Current IC, these delivering a documented output of mA and uA at all times.
Even if newer datasheets, they do not include detailed information's.
At least I will chart-down my CNX 3000 Ohms ranges.

8845A/8846A Users Manual / page 1-14, this is very informative regarding Source Current.
FLUKE 289  Users Manual, also includes relative details.

[Kiriakos GR]

Here is extended FLUKE 8846A, current source output per range.
Most modern HH DMM, at 600 Ohms range, they should deliver also 1mA with sorted test leads.
By having an second HH DMM, you can confirm it too, by using it current input at mA DC mode. 

1- range 10 ohm is 5.000 mA.
2- range 100 ohm is 1.000 mA.
3- range 1 Kohm is 1.000 mA.
4- range 100 Kohm is 0.100 mA.
5- range 1 Mohm is 0.010 mA.
6- range 10 Mohm is 0.001 mA.
7- range 100 Mohm is 0.001 mA.
8- range 1 Gohm is 0.001 mA.