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Elma BM869 side 8
AC Båndbredde
AC båndbredde for et digitalt multimeter er området over frekvenser, over hvilket AC
målinger kan udføres indenfor den specificerede nøjagtighed. Det er ikke
frekvensmålefunktionen, men frekvensrespons for AC funktioner. Et digitalt multimeter kan
ikke præcist måle AC værdien med frekvensspektrumsfald over AC båndbredde for
multimetret. Derfor spiller store båndbredder en vigtig rolle i multimetre med god
nøjagtigheder. I realiteten indeholder komplekse bølgelængder, støj og meget højere
frekvensspektrum end principielt.
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.
Funktion
Note! Før og efter farlige spændingsmålinger, test da spændingsfunktionen på kendte
ledningssystemer, såsom forsyningsspænding for at bestemme korrekt funktion.
Generelt: I overskriften beskriver f.eks. ACV den nederste displayvisning og
HZ
vist: ”ACV
+HZ
beskriver den øverste displayvisning.
VFD (Variabel Frekvens) ACV
+HZ
, VFD
+ACV
funktioner (Kun på Elma
BM869)
Drej omskifteren til (se nedenstående figur). Tryk på SELECT knappen flere gange
for, a t vælge funktion/er. Sidst valgte funktion vil gemt, når der slukkes for instrumentet.
Tryk på RANGE knappen over flere gange for, at vælge andre måleområder
(kommaplacering).
8


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