(3)
F IL T E R
G en e ra lly , a low -pass filte r is u sed fo r c o u n te r in p u t. T h e c u to f f fre
q u en c y is a b o u t 10 0 kH z fo r th e T R 5 8 2 1 /2 2 /2 3 . T R 5 8 2 3 IN P U T C
h as th e A N S (A u to m a tic N oise S u p p re sso r) c a p a b ility , an d a filter is
ch a ng ed in c om p lia n ce w ith th e signal to b e m e asu re d .
Prescaler
Inp ut
Shaped ou tpu t
j n
A N S /F IIT E R OFF
AN S/F I LTER ON
(4 ) L E V E L
T h e trig g er level chan ges w ith in a range o f a b o u t +1 V to —1 V ,th a t is,
th e trig ger p o in t can be set in th e in p u t vo ltage range o f +1 V to - 1 V.
F o r S E N S . x lO an d xlO O , th e in p u t vo ltag e range a pp e ars to vary b e
tw ee n + 1 0 to —10 V a nd + 1 0 0 to —10 0 V re sp e ctiv ely .
LE V EL
(5)
S E P ./C O M . A
T h e co u n te r has an in p u t c o n n e c to r c o rre sp o n d in g to eac h in p u t c ha nn el.
In m eas u rin g th e tim e in te rv a l o f a single sign al, th e sa m e signal is in p u t
to b o th in p u t c o n n e cto rs. If SE P ./C O M . A is set to C OM . A , th e signal
at IN P U T A c o n n e c to r is su p p lie d to c h a n n els A a n d B; in C OM . A , h ow -
5-4
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