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2461Type C User Manual
Racal Instruments
1998
Theory of Operation 3-7
Figure 3-2, Measurement Block
G
at
e Cont
rol
, F
unct
ion
&
M
ul
tip
le
x c
ir
cu
its
Inpu
t 1
C
ount
ing c
ha
in
Re
fe
re
nc
e/
Inpu
t 2
C
ount
ing Cha
in
B
U
FFE
R
To
M
ic
ro
cont
ro
ll
er
Da
ta
Bu
s
Ti
m
in
g E
rr
or
C
or
rec
tio
n
Ci
rc
ui
t(
T
E
C
)
S
tar
t C
or
rect
io
n
S
top
C
or
re
ct
ion
St
ar
t C
ou
nt
in
g
ch
ai
n
St
op
C
ou
nt
ing
C
ha
in
R
efe
re
nc
e(
C
L
O
C
K
10
/IN
TE
R
N
A
L
)
Ex
te
rn
al
R
ef(F
ro
nt
P
an
el
)
B
U
FFE
R
Fr
om
M
ic
ro
cont
ro
ll
er
A
ddre
ss
Bus
Inpu
t 1
Inpu
t 2
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