HP 5383A

α
M
o
d el 5383 Α
O pe r ation
b .

Wh e n t h is switc h p ositio n is c h a n ged , t he frequency cou
n
ti
n g
ci
r c u its a r e automati-
cally r eset to ze r o co u nt . T h e n ew f r e qu e
n
cy
cou nt is t h e n d isplaye d afte r α d elay
w h ic h is d ete r mi n ed by t h e GAT E TIME p
ositio n (i .e ., t he meas ur ement time) .
ι .
Digit self-test p r ovi d es α d is p 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
a ph
3-11) .
4 .

I NPU T switc h : Selects one of t he followi n g i npu t im
ped ances a nd atte nu atio n s :
50 Ω Χ 1

T h is inp u t is pr otecte d f r om i n pu t sig
n
als
t h at excee d 3 .5 V r ms (+24 dB m) by an
i n te rn al 0 .1 amp f u se ( r efe r to Pa r ag
r
a ph
3-11) .
1 ΜΩ Χ 1 S hun t cap acity : less t
h
a
n
40 pf
.
1
ΜΩ
Χ
10 S
hu nt capacity : less t ha n 40 pf .
5 .

I NPU T conn ecto r : Co nn ects sig n al to b e meas
ur
e
d to i n te rn al ci r c u its . I mp e da n ce a nd
atte nu atio n at t
h
is j ac
k
is
selecte d
by
I NPU T switc h .
6 . I N T ERNA L F I L T ER
switc h ( n ot s h ow n , see Fig ur e 8-1) : T h is switc h is positio ned i n t he
d i r ectio n of t h e ar r ow (">") to select α 100 kH z low pass filte
r .
T
h
is
filter pe r mits
sta b le f r e qu en cy meas ur eme n ts i n t h e 10 Hz to 100 kH z
r
a
n
ge
w hen t he i n p u t
contai n s h ig he r f r e q uency n oise .
3-6
Fig ure 3-1 . Fr o n t P an el a nd I n ter n al Cont
r ols, I nd icato r s a nd Co nn ecto r s (Co n ti nu e d )