Noob multimeter question
Noob multimeter question
(OP)
I'm going to pre-apologize for this question, as it's pretty simple:
I have a multimeter that I'm trying to figure out what the accuracy is when measuring small values of ohms (.5-10ohms). The booklet for the meter states:
Range:500.00ohms, Resolution: 0.01 ohms, Accuracy 0.05%+10^3
I don't understand the last part of the accuracy reading. The 0.05% I understand (say 20ohms: 20*.0005 = 0.01ohm, so I could read 19.99 to 20.01) but what does the 10^3 mean?
Thanks for any assistance.
I have a multimeter that I'm trying to figure out what the accuracy is when measuring small values of ohms (.5-10ohms). The booklet for the meter states:
Range:500.00ohms, Resolution: 0.01 ohms, Accuracy 0.05%+10^3
I don't understand the last part of the accuracy reading. The 0.05% I understand (say 20ohms: 20*.0005 = 0.01ohm, so I could read 19.99 to 20.01) but what does the 10^3 mean?
Thanks for any assistance.





RE: Noob multimeter question
Offhand, it looks to be a typo, since most such specifications are usually a percentage, which represents a scaling error, and the measurement noise, which is usually given as "counts."
So, it would normally read "0.05% +/- 3 counts," or something to that effect.
TTFN
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RE: Noob multimeter question
+/-([% of reading] + [number of least significant digits])
Isn't 10^3 = 10,000? I don't understand at all. Maybe it is a typo...
RE: Noob multimeter question
Accuracy ± (0.05%+2)
The 2 means 2 LSD, so is it accurate to 0.1 ohm then since the range is listed as 500.00?
RE: Noob multimeter question
The Fluke Series 80 manual uses forms like +/-(1.0% + 3)2 where the superscripted 2 refers to Note 2 at the bottom of the table.
htt
TTFN
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RE: Noob multimeter question
>Accuracy ± (0.05%+2)
>The 2 means 2 LSD, so is it accurate to 0.1 ohm then since the range is listed as 500.00?
The accuracy depends on the reading.
Let's work through it.
Suppose you are measuring roughly 500 ohms.
0.05% of the reading is 0.25 ohms.
2 LSDs is 0.02 ohms.
The accuracy is ±(0.25 + 0.02) = ±0.27 ohms.
If you are measuring only 50 ohms on this same scale the error is then ±(0.025 + 0.02) = ±0.05 ohms
RE: Noob multimeter question
This does not, however resolve everything as the specs seem to be conflicting. The book says 10 LSD and the web says 2 LSD.
Logbook: Thanks for the example, it makes the computation completely clear, but I still have the problem with the two listed specs not matching now.
RE: Noob multimeter question
Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com
RE: Noob multimeter question
Generally, the stuff on web pages tend to be the BEST possible performance, while the actual manual lists all possible configurations. You'd need to identify the particular model, the webpage, and a link to the manual for us to get any further insight into the problem.
TTFN
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RE: Noob multimeter question
RE: Noob multimeter question
The extended spec: h
Everything seems consistent to me.
TTFN
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RE: Noob multimeter question
Gunnar Englund
www.gke.org
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: Noob multimeter question