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α
M
o d el 5383Α
O
p eration
b .
Wh e n
t
h is switch positio n is c h an ged , t h e frequency cou n ti n g ci rc u its are automati-
cally
r
eset to zer o co u nt . Th e
n
ew fr equ e n cy co u nt is t h en d isplaye d afte r α
d
elay
w h ich is
d
ete r mi n ed by t he GATE TIME
p
osition (i .e ., t h e meas ur ement time).
ι .
Digit self-test p rovi d es α
d
isp lay
d
igit self-test capab ility .
Wh e n
t
h is switc h is set
b
etwee n two GAT E TIME positio n s, all
d
isplay
d
igits s h oul d
s
h own "8" (see
NOTE
i
n Pa r ag r aph 3-11) .
4.
I NPUT switch : Selects on e of t h e followi n g i npu t im p ed ances a nd atte nu atio ns :
50 Ω Χ 1
T
h is inp u t is pr otected
f
r om i np ut sig n als t h at exceed 3.5V r ms (+24 d B m)
b
y an
i n te rn al 0 .1 amp fu se ( refe r to Parag r a ph 3-11) .
1 ΜΩ Χ1
S
hun t ca p acity: less t h a n 40 pf .
1 ΜΩ Χ 10
S
hu nt capacity : less tha n 40 pf .
5 .
I
NPUT co nn ector: Co nn ects sig nal to
b
e meas ur e d to i nte rn al ci r c u its . I mpe d a n ce a nd
atte nu atio n at t h is
j
ac k is selected by
I
NPUT switc h .
6 .
I N T ERN A L FI LT ER switch (n ot shown , see Figure 8-1) : T h is switch is positio n ed in
t
h e
d
i rection of th e ar r ow (">") to select α 100 kH z low pass filte r . T h is filter
p
er mits
sta b le f r equen cy meas ureme n ts i n
t
h e 10 Hz to 100 kHz
r
a n ge w h en t h e i n p u t
contai ns
h
igh er
f
r equency
n
oise .
3-6
Figure 3-1 . Fr
o
n
t
P
a
n
el a
nd
I
n
ter
n
al Cont
r
ols,
I
n
d
icato rs
a
nd Co nn ectors
(Co
n
ti
nu
e
d
)
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