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  • Plantijn Hogeschool Van De Provincie Antwerpen (AP)
  • Chemie
  • Fysica
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Samenvatting Werkcollege toegepaste fysica

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Meetfouten en vochtigheid van de lucht Lector: Ingrid Van den Bossche

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MEETFOUTEN
1. Absolute fout (AF)
- Grootheid = (waarde ± AF) . 10n . eenheid
 Grootheid = naam van wat we meten
 Waarde = dichtstbijgelegen waarde op de schaalverdeling
- Standaard
 AF op toestel
 AF = de helft van de kleinste schaalverdeling op het meettoestel
 AF op een meting
 Meting = twee aflezingen (nulpunt en meting) = 2x een halve verdeling
 AF = is een volledige kleinste schaalverdeling
 [AF] = eenheid meetresultaat
- Afronden AF
 2 B.C.: 1ste B.C. = 1 of 2  vb. AF = 12 of AF = 27
 1 B.C.: 1ste B.C. > 2  vb. AF = 5 of AF = 4 . 102
 Vermijd onbeduidende nullen  300 = 3 . 10² of 0,03 = 3 . 10-2 of 3000g = 3kg
of 3 . 10³g
 Meetresultaat wordt afgerond zoals AF


2. Relatieve en procentuele fout
- Relatieve fout (RF)
 RF = AF/waarde grootheid (W)
- Procentuele fout
 PF = RF . 100% = AF/W . 100%


3. Rekenen met meetresultaten
- AF op gedetailleerde grootheden (zie cursus)
- Som of verschil = AF optellen (nooit aftrekken)
- Vermenigvuldigen of delen = PF optellen (nooit aftrekken)

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  • absolute fout
  • relatieve fout
  • vochtigheid

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