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| Fluke accuracy ±(2%+2) - What means the +2? |
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| 2X:
Hello, does anyone knows what means the +2 on 2%? If we meausure a known voltage 100V then the multimeter will show a value between 88V-102V. At the example on the below link says 97.8 V to 102.2 V, so I suppuse the +2 is equals with 0.2 but how this arises? If the +2 means 0.2 why the didn't write just ±2.2%? I haven't see any similar declaration on other multemeter. https://www.fluke.com/en-us/learn/blog/digital-multimeters/accuracy-precision |
| voltsandjolts:
+2 of the rightmost digit on the display |
| BeBuLamar:
So if the reading is 50V then the actual voltage can be 48.8 to 51.2 that is +/- 2% plus 2 more counts of the last digit. So if it reads 1V then it's like 0.8 to 1.2V. In this case the 2% is less than the 2 counts error. |
| voltsandjolts:
The OP hasn't specified the actual DMM but ±(2%+2) likely means ±(2% of reading + 2 least significant display digits) |
| HKJ:
--- Quote from: 2X on March 17, 2024, 10:41:15 am ---Hello, does anyone knows what means the +2 on 2%? If we meausure a known voltage 100V then the multimeter will show a value between 88V-102V. At the example on the below link says 97.8 V to 102.2 V, so I suppuse the +2 is equals with 0.2 but how this arises? If the +2 means 0.2 why the didn't write just ±2.2%? I haven't see any similar declaration on other multemeter. https://www.fluke.com/en-us/learn/blog/digital-multimeters/accuracy-precision --- End quote --- Nearly all multimeters uses that way to specify tolerance, it is necessary. An example: Multimeter in 100.0V range and display shows 0.1V with shorted input, what is the tolerance? It is way above 1000%, if you only specify in %, but by saying +2, it is covered in the specifications, without affecting the % tolerance. If have written a bit about multimeter tolerances here: https://lygte-info.dk/info/DMMTolerances%20UK.html |
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