APPENDIX B
GLOSSARY
A cq u isitio n T im e
A cq u isitio n tim e m e an s th e tim e fro m c o u n te r re se ttin g to th e sta rt o f
c o u n te r o p era tio n . T h e a cq u is itio n tim e o f o rd in a ry c o u n te rs is virtu ally
ze ro , w h ere as m ic ro w av e-b a nd co u n te rs re qu ire a c ertain a c q u is itio n tim e.
F o r th e T R 5 2 0 0 series c o u n te rs o f A D V A N T E S T , th e a cq u isitio n tim e refers
to th e tim e re q uire d u n til th e in te rn a l o sc illa to r is ph ase lo ck ed to th e in p u t
signal.
A L C (A u to m atic Level C o n tro l)
A fu n c tio n to d ete c t an d c o rre c t th e DC flu c tu a tio n in th e circ u it cau se d b y
te m p e ra tu re d rift fro m th e in p u t te rm in a l to th e o u tp u t o f th e w id e-b an d
am p lifie r.
A N S (A u to m a tic N o ise S u p p re sso r)
A D V A N T E S T ’s p a te n te d te c h n iq u e .
A c irc u it th a t a u to m a tic a lly su p presses th e n o ise rid in g on th e signal to be
m e asu re d .
A u to m a tic F ilte r
C u to ff freq u e n cy is a u to m a tic a lly se le c te d acc o rd in g to th e in c o m in g fre 
q u en c y to elim in ate ra n d o m no ise o r n o ise ad d ed o n th e in p u t sig nal, th e re b y
p rev e n tin g erro rs asso ciated w ith n o ise . A u to m atic filte r m ak es u p fo r the
d isa dvan tag es th a t th e A N S c a p a b ility c o n trib u te s little to th e su p p re ssio n o f
ra n d o m n o is e, im pu lse n o ise o r n o ise larg er th a n th e sign al o f in te re st w hile
it serves w ell fo r su p p re ss io n o f th e su p e rim p o se d n o ise.
A u to m a tic T rigger S e ttin g
T rigger level se ttin g is q u ite d iffic u lt an d b o th erso m e w h en th e sign al to be
m e as ure d is sm all. T his se ttin g o p e ra tio n is sim p lifie d b y th e a u to m a tic
trig ger se ttin g . T rigger level is a u to m a tic a lly se t at th e 50% level b e tw e en
th e m ax im u m a n d m in im u m p ea k s o f th e in p u t sign al. T his c ap a b ility
fa cilita te s th e trig ger level se ttin g o n th e p ulse d signal w ith th e o ffse t vo ltage
o r o f d iffe re n t d u ty cy cles, a n d m in im iz es false c o u n tin g .
A-3
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