In p erio d m e as u re m e n t, th e trig ger e rro r is re d u ce d to l/ 1 0 n fo r averaging
n u m b er 10n . In tim e in te rval m e a su re m e n t, o n th e o th e r h a n d , th e trigg er
e rro r is re du ce d to o n ly l /\ /T 0 " fo r averagin g n u m b e r 1 0n . T his is bec au se
th e averagin g te c h n iq u e d iffers fro m th a t fo r th e p erio d m e as u re m e n t as
sh o w n ; th a t is, c o u n tin g is p e rfo rm e d co n tin u o u sly fro m m ea su re m e n t
sta rt to en d in p e rio d m e a su re m en t w h ereas , in tim e in terv a l m ea su re m e n t,
co u n tin g is in te rm itte n t as sh o w n in th e figu re o n th e p rece din g page an d
a ±1 c o u n t e rro r o cc u rs a t e a ch c o u n tin g . T h e re fo re , if th e signal to b e m e a
su red is very sta b le , th e a cc u ra cy is n o t im p ro v ed b y averaging.
5-11
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