Ki jan yo kalkile presizyon nan yon miltimèt?
Accuracy depends on the error value included in the measurement. The accuracy specification is expressed as follows: " percent of reading plus percent of span". In this formula, " percent of reading" is proportional to reading, and " percent of range" is the offset value. These specifications are developed for each measurement range.
Si presizyon an pa satisfè egzijans rezolisyon mezi a, lè sa a rezolisyon an pa gen okenn efè sou presizyon an. Sepandan, ou ka toujou itilize yon miltimèt pou kontwole ti chanjman pandan mezi a.
Egzanp: Sipoze ou vle mezire yon siyal 10 Vdc ak yon miltimèt 34401A ak yon presizyon 1 ane ak yon seri 10V, Lè sa a, presizyon an se: 0 .0035 plis 0.0005=10 x (0.0035 / 100) plis 10 x (0.0005 / 100)=plis /- 0.00040
Se poutèt sa:
Valè mezire: 10.00000
Presizyon se: plis /-0.00040
Rezolisyon se: 0.00001
Lekti aktyèl la se ant 9.9996 ak 10.0004
De dènye chif mezi a gen ladan erè.
Some models of multimeters use "ppm" instead of " percent of reading" and " percent of range". The value of ppm can be obtained by multiplying by 1/1,000,000 (= 10-6).
Egzanp 1: Si erè 1 (V) se 10ppm, valè erè aktyèl la se 1 x 10 x (1/1,000,000) = 0.00001 (V)
Egzanp 2: Si erè 1 0 (V) se 5ppm, valè erè aktyèl la se 10 x 5 x 10-6=50 u (V)
Espesifikasyon presizyon yo defini nan sikonstans espesifik, tankou chanjman tanperati anbyen ak anviwònman enstriman (tankou AUTO ZERO ON/OFF).
