HP 8110A Service Manual page 228

P
erio
d B
oar
d
F
ΧΓ IN
ο
T
RIGGER
INPUT
m
from PLL
o
ption
M
ICRO
DEVICE BUS
PROCE SSOR
INTE RF AC E
DIAGNOSTICS
Th e
P
er
i
od
B
oard is based on t
h e
TI
G
ER (TImin g G
En
erato
R
)
I
C.
Th
e
TI
G
ER i
s bas
i cal
ly
an asta
bl e osc
ill
ator
wh
e
n i
t is r
unnin
g
wi
t
h
o
u t exter
n
al dr
iv
e or tr
i
gger
in
g, or as α
m
o
n osta
bl
e
wh
e
n
tr
i
ggere
d f
ro
m
α so
u
rce e
x ter
n
al to t
h
e
P
er
i
od
B
oard .
E
xter
n
al
tr
i
gger
in g can
b
e
f
ro
m
α
PLL B
oard
in
s
i de t
h
e HP 8110Α (o
p t
i
o
n
al),
p
ro
vi
d
in g greater acc
u
rac
y
a
n
d stab
i
lit
y
, or
f
ro
m
α so
u
rce e
x ter
n
a
l
to t
h
e
in
str
um e
n
t,
p
ro
vi
ded
by th
e
u
ser .
Th
e
wi
dt
h
o
f
t
h
e o
u
t
pu t
p
u
l
ses is
v
ar
i
ed
by t h
e co
n
tro
l
c u
rre
n
t.
Th
e
TI
G
ER i
s a
l
so ca
p
a
bl
e o
f
bu
rst-fir
in
g,
p rod
u
c
in
g α
sp
ec
i fied
numb
er o
f pul ses .
Fi
g
u
re 7-4 s
h
o
w
s t
h
e
fun ct
i
o
n
a
l uni ts on t
h
e
P
er
i
od
b
oard .
Th ese
h
a
v
e
b
ee
n numb
ered
f
or eas
y
cross-re
f
ere
n
ce
b
et
w
ee
n th e descr
ip
t
i
o
n
a
n d t
h
e d
i
agra
m
.
--------------
-----------------
CURRENT
SO
U
RC
E
71GER IC
MEMORY 1 4
4K x 4
C
M
OS/ECU L
CON VERSION
Uni
t
F
u
n
ct
i
o
n
P
OWER
F
I
L
T
E
RS
O
L
I fPUf CHANNELS bS
ν
6
Th
e
uni
ts, a
n
d
wh at t
h
e
y d
o, are as
f
ollo
w
s:
HP 8110 Α Service Guide
S
STROBE
OUTPUT
ΑΜΡυειΕR
TRIGGER
O
UT
P
UT
AMPUFIER
TO
OUTP UT
B
O
A
R
D
O
R
OPT-
IONAL
D
ESKEW
BOARD
S
S = SELFTE SfSENSING POINT
F
igure 7-4. Th e
P
eriod
B
oard
F
u nctional Units
1-
P
o
w
er
Fil
ters
N
o
i
se is re
m
o
v
ed
f
ro
m p
o
w
er a
ppli ed to t
h
e
P
er
i
od
b
oard .
2-
D
e
vi ce
Bu
s
In
ter
f
ace &
Di
ag
n ost
i
cs
Th
e
P
er
i od board
u
ses t
h
e
D
e
vi
ce
Bu
s
In
ter
f
ace
(DBI) to co
mmuni
cate
wi
t
h th
e
mi
cro
p rocessor .
Se
lf
test is also
p
er
f
or
m ed
in thi
s
fun
ct
i
o
n
a
l bl
oc
k
3-
T
r
i
gger
Inpu
t An exter
n al tr
i
gger s
i
g
n
a
l i
s
p rocessed
4-
TI
G
ER I
C,
M
e
m
or
y
, a
n
d C
M
OS/
E CU Co
nv
ers
i
o
n
Thi
s is t
h
e
h
eart o
f t h
e
P
er
i
od
B
oard,
b ased on
t
h
e
TI
G
ER I
C.
Th e o
u
t
pu
t s
i
g
n als are ge
n
erated
h
ere
f
or
fu
rt
h
er
p
rocess
in
g
by t h
e
Wi dt
h B
oard,
t
h
e
D
es
k
e
w B
oard
(wh
e
n
fitted) a
n d 1 or 2
Functional Desc rip tion 7- 19