ev er, th e in p u t im p e d an c e w ill be a b o u t 50 0 k f i an d th e sh u n t c ap aci
ta n c e a b o u t 6 0 p F . T he T R 5 8 2 1 /5 8 2 2 /5 8 2 3 have tw o fre q u e n cy m o de s,
F R E Q . A a nd F R E Q . B. F R E Q A gives h ig h er p rec isio n fo r fre qu en cies
ab ov e 1 M H z, a n d F R E Q . B gives h ig h e r p recisio n fo r fre qu e nc ies b elo w
1 M H z. H igh-p recision m ea s u re m en t o ver a w ide range o f freq uen cies
is en a b le d b y sw itc h in g b e tw e e n F R E Q . A an d F R E Q . B at se ttin g
CO M . A.
INPU T A
©
-------------
1^ -
------------------- Channel A
SEP. being set
4 '
IN PU T B
©
-------------
n
-------------------
Channel B
As sh o w n a bo v e , th is sw itch in g is m ad e im m ed ia te ly a fte r th e in p u t
c o n n e c to r; th e re fo re , A C -A U TO -D C , S E N S ., S L O P E , an d L EV EL
se ttin g s can b e m a d e in d e p e n d e n tly fo r e ac h ch an n el.
(6 ) S LO PE
T his is n o t u sed so m u c h b y fu n c tio n s o th e r th a n tim e inte rv al m e asu re
m e n t; ho w e v er, it is effe ctiv e w h en th e jitte r varies w ith th e slo p e. F o r
e x a m p le , th e p e rio d m e a su re m e n t is a ctu a lly th e tim e in te rv al m e asu re
m e n t b etw e e n th e slo pe s o f th e sam e p o la rity , a nd if jitte r e x ists, th e
m e as u re m en t value is also u n sta b le .
5-5
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