Author Topic: Unit-61E Accuracy  (Read 18351 times)

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Offline usao

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Re: Unit-61E Accuracy
« Reply #25 on: June 05, 2018, 09:58:01 am »
Ok, entry level question.
I just got the UT-61E (mainly because of the 22,000 counts).
Never had a meter better than a Harbor Freight special before.
Interested in checking accuracy now that I have so many counts.
Specs say resistance in the medium resistance range is 0.5% (I think it's something like up to 200K or so).
If I get a Vishay 0.01% resistor in that ohm range that should be accurate to the last digit the meter can display, so it would tell me the total error (number of digits) off the meter is compared to the resistor, is that correct?
So, a 100K @ 0.01% resistor is going to be between 99,990-100,010 ohms, correct?
The meter cant display anything greater than 0.5% accuracy (99,500-100,500 ohms)?
 

Offline Fungus

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Re: Unit-61E Accuracy
« Reply #26 on: June 05, 2018, 12:33:45 pm »
So, a 100K @ 0.01% resistor is going to be between 99,990-100,010 ohms, correct?

Correct.

The meter cant display anything greater than 0.5% accuracy (99,500-100,500 ohms)?

The specification is actually "0.5%+10" so you have to add/subtract 10 to those numbers.

Result: 99,490-100,510 ohms

But ... notice that the meter is "22,000" counts, ie. it can't display "99,490" on screen.

When you measure your resistor it will select a range from 0 to 220,000 Ohms and will display a number in the range 99.49k to 100,51k ohms.

A 200k resistor would be a better choice because the upper/lower values of error will both show 5 digits on screen.
« Last Edit: June 05, 2018, 12:54:54 pm by Fungus »
 


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