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Service Model
8904A
r
~
-
OUTPUT!
I
*
t
LEVEL
CHANNEL
A
PULSE
t
'L
FREOUENCY
_+_o
Lt-
PULSE
\SUM
1
LEVEL
p
LEVEL
q
LEVEL
SUM
I
PHASE
x
'L
FREOUENCY
CHANNEL
B
9
PHASE
@
PHASE
/L
FREOUENCY
0
'L
FREOUENCY
0
CHANNEL
C
CHANNEL
D
Figure
8-6.
Conceptual
Block
Diagram
of
an Instrument with Options
001
and
002
8-20
Principles
of
Operation (Overall)