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Elma BM 251-252-255-257
side 8
Crest faktor
Crest faktoren er forholdet imellem Crest (konstant peak) værdi og sand RMS værdien, og
er som regel brugt til at definere det dynamiske område på et sand RMS multimeter. En
ren sinusformet bølgelængde har en crest faktor på 1,4. En dårlig sinusformet
bølgelængde har normalt en meget højere crest faktor.
NMRR (Normal mode rejection ratio) (normal funktion afslags forhold)
NMRR er multimetrets evne til at undgå uønsket AC støjeffekt, som kan skabe ukorrekte
DC målinger. NMRR er typisk specificeret i dB forhold (decibel). Denne serie har en
NMRR specifikation på >60dB ved 50 og 60Hz, hvilket betyder, at de har en god evne til at
afvise effekten af AC støj i DC målinger.
CMRR (Common mode rejection ratio) (common funktion afslags
forhold)
Common funktionsspænding er spænding tilstede på både COM og SPÆNDINGS
bøsningerne på et multimeter, med forhold til jord. CMRR er multimetrets evne til at undgå
common funktionsspændingseffekt, som kan gøre, at cifrene ruller rundt i displayet eller
helt slukker ved spændingsmålinger. Denne serie har CMRR specifikationer på >60dB ved
DC til 60Hz i ACV funktion; og >120dB ved DC, 50 og 60Hz i DCV funktion. Hvis hverken
NMRR eller CMRR specifikationerne er udpenslet, vil et digitalt multimeters udførsel være
unøjagtig.
Funktion
Note! Før og efter farlige spændingsmålinger, test da spændingsfunktionen på kendte
ledningssystemer, såsom forsyningsspænding for at bestemme korrekt funktion.
Autocheck funktion
Denne innovative Autotjek funktion vælger automatisk målefunktioner for DCV, ACV eller
modstand, baseret på input via testledningerne.
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