HP 3320A Operating And Service Manual page 36

Model 3320A/B
Section IV
BCD CONTROL LINES
,..
10'·
100"
IOrOKNERANGE)
LOAD
PRESET
NO.
VTO
I I
~
FREQUENCY
--:J
(I~'Z)
PRESETTABLE
I
,.
,
,. ,
(CLOCK)
PRESETTABLE
PRESETTABLE
,
t---- '
(Ie 3) (IC4) OECA6~Cc1)uNTER
I
A 8
DECADE COUNTER DECADE COUNTER
(IC6 ) (ICGl
~
,
,
4
,
,
,
,
(1~2:1
+5v
,.-J
,
,
,
,., ,
,
,. F
L - -
F·F
), C
0 E
( 1e7)
(Ice)
(ICBl
IO~Hz
,
, , ,
,
, ,
OUTPUT TO
TRIPLE INPUT
---K
C
PHASE
J-K FLlP- FLOP
COMPARATOR
L.
."0./.·.·....
Counting Flip-Flops
Presettable Decade Counters
Flip-Flops Gates
Sequence
B
A IC5 IC4 IC3
C D E
F
G
Remarks
BCD
BCD
2
1
Preset
0
, , · ·
·
0 0 0
Enabled Disabled Start of Cycle
Number
Preset
+
1 t t t t t t
3990 1 1 9 9 0 0
Enabled Gate G Enabled
1
1
9 9
0
1
1
1 1 9 9
1 0
3993 1
1 9 9
1 1 0 0 0
Enabled Enaoled
3994 0
·
· ·
· ·
1
0
0
Disabled Disabled Counters and F·F 1 are
preset.
F·F
S, is cleared
3995
0
· ·
·
·
·
1 1
0
3996 0
· · ·
· ·
1 1
1
Output to phase
comparator goes high
3997
0
•
· · · ·
0 1 1
3998 0
· · · · ·
0 0 1
Disabled
3999 0
· ·
·
· ·
0 0 0 Enabled
Disabled Output to phase
comparator goes low
and cycle repeats
Set to preset number
t
Preset number
+
1
Figure 4-19. -;- N Control Logic Diagram.
4-13