HP 5383A

M o d el
5383 Α
T h
eory of O p
e r atio n
Μ G
(Al U23-12)
R
ST
B
( Α 1 U 23-8)
TR
(Al U 22-10)
T R
(Al U 19-10)
R SC
(Al U20-3)
R SC
(AI U 19-2)
DIS PL AY SCA
N
TIME
(S
EE ΝΟΤΕ
1)
N OT ES
1 .

M G E is an EE C L ve r sio n of t he TT L M G sig
n
al
.
2 . Dis p lay sca n timi ng and t h e timi ng of t
he M G (o r M G E)
sig n al a r e asy n c
hr
o
n
o
u s . T h
e
r efo r e, t he p ositive t r a n si-
tion of t h e M G (o
r M
G E)
signal (i .e ., t r aili n g ed ge)
occur s dur
i ng
any
r and om time .
3 . MG (o
r M
G E)
wi d
t
h ("t") dep e nd s
on
t he setti ng of t h e
GAT E TIME switc h .
M
G E
is
low
dur i n g time "t", allowing t he f r e qu ency co un te r s to co un t t
h
e i
npu
t
signal
f r e qu en cy . The sto r age latc h es a r e isolate d f r om t h e co un te r s at t
h
is time .
Ο 2 Afte r t he MG signal termi n ates, t h e R S TB la tc
h
is set at
t h e b egi nn ing of sca n time S9 .
T h is i n itiates t he upd ate se qu e n ce . Α
R
ST
B sig n
al
h ol d s M G E off (i .e ., h ig h ) un til t h e
com p letio n of t he u p
d
ate
se qu
e
nce (ap pr oximately 0 .5 mi Γ lisecon d s late r ) .
D ur
ing
sca
n time
99,
T R an d T R pu lses are gene r ate d . T h ese sig n als con nect t he co un te
r
ou t p uts to t h e sto r arge latc h es ; r es u lti n g i n t he t r a n sfe r of
n
i
n
e B CD c
h
a
r
acte
r
s to
t h e
latc h es .

Wh en t he T R and TR p u lses e
n
d, t
h
e latc
h
es
a r e again isolate d f r om t h e fre-
quency co un te r s .
Du
r ing
scan
time
S8
R SC and R SC pu lses reset t he f r e qu e n cy coun te r s to ze
r
o .
D ur ing
scan
time S7, t he R STB latc h is clea r ed , e nd i n g t h e upd ate se qu e
n
ce, a
nd r eleas-
i n g M G E (i .e ., allo w i ng it to go low) to allow a
n
ot
h
e
r
frequency co
un
t .
F ig ur e 4-3 . Up d
ate Fun ctio n