Model 8640B TM 9-4935-601-14-7&P
Figure 8-19. Counter/Lock circuits Block Diagram
8-25
FREQUENCY
MAX
CCW
TUNE
LEVEL
-5
TO
-10
dBm
FREQUENCY
229.6t
0
.•
MHz
6'
-
r--------,
I TIMf
BASE
:
L--~~--.J
r------,
: IN/OUT :
L-------..J
MAXCY'!
-5TO
-10d8m
560.5
.t
ll.5 MHz
l
COUNTER
J~
INPUT
/
'-'
0,
I'
r----,
1 TIME I
Q
I
BASE
I
I REF I
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I
I
I
l:~~J
1
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rv
~~r~-=-=-==,o.~>-1r----~------~T7,1M:.~.~~~E
L
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O
DECODER
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I
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I
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I
:r~~~
I
L---
TIME
BASE
VERN
...
CCW
[OUT
OF
DETENT)
UNCAL
(LAMP!·
ON
P/0 A8
COUNTeR/LOCK
ASSY
r A&::,:
..
~:=---
A8Al
RF
SCALER
ASSV
:
fA8A3
.~
IABA11
MODE
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tOFFI
tONI
~0
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lk.. I
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TO
TTL
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TRANSLATOR
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v
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------
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18
P/OASCOUNTERILOCKASSY
____
_
r-------
l
AS
I\8A2 CO':NT..:R/LOCK BOARD ASSY
I
IABA2
I
I
I
COUNTER
LOAD
r------,
[COUNT
DOWN}
UP/OOWN
COUNTER
DECIMAL
f'OINTS
L__
L_
RANGE
128 TO 256
MH~
·;,.;·
_l
OFF
lOC.
j
t=:XPAND
OFF
J 312.5 t
.1Hz
Jl09.o4
1
1
Hr
EXPAND X1Q 31.3 t .1
Hr
J0.9
'
.1Hz
EXPAND
X100
].1
t
.1
Hr
5.1
:
.1
H~
TTL
SQUARE
WAVE
COUNTER
MODE
SOURCE
EXT
0-
10
COUNTER INPUT
...•
EXTERNAL
100
mV
INTO
500
AT
I
kH,
1
kHz:
nL
SQUARE
WAVE
3587.50 i
6.2'5
kHr
TTL
SQUARE
WAVE
NULL
PHASE
DETECTOR
I COUNTER
MODE
"
0~
' I
I
IONI
0
!OFF)
~
~
____
_j
EXPANO X10
OVERFLOW
[LAMP)
.
NOTE:
TTL
VOLTAGE
LEVELS
QTOD.4Y
2.'
T05.2
Y
LOCK
...
· · · · · · · · · · . . .
...
ON
TIME
BASE
VERNIER. , .
C:AL
TO
MAX
CCW
DISPLAY
DOES
NOT
FLASl-1
LOCK
.•.
· · · • · ·
ON
TURN FREQUENCY
TUNE
1/4
TURN
CW
DISPLAY'
FLASHES
AT
2Hz
RATE
FREQUENCY'
TUNE
· · ·
LOCK
...
· · ·
• 1
TURNCW
..
ON
AFTER
SETTING
LOCM:
TO
ON.
TURN
FREQUENCY
TUNE
114
TURN
CCW
DISfllAY
FLA.SHESAT2
1-h
RATE
SET
CONTROLS
AS
FOLLOWS:
(UNLESS
OTHERWISE
SPECIFIED)
METER
FUNCTION.
· · · · · · · ·
·LEVEL
COUNTER
MODE~
EXPAND·
· · · · · · ·
OFF
LOCK .
OFF
SOURCE . . .
...
INT
TIME
BASE
VERNIER
• · · · ·
g!~
AM.
.
..
OFF
FM · • · • ·
B-18MHr
~~in:;~t::::
·:::::
.,~E
TIME
BASE
REF (REAR PANEL) · · • • • '
INT
-,
I
I
I
I
J
-
_.J
+12~1Vdc
20.21
COUNTER MOOE
SOURCE
EXT
0-
10
CONNECT
REAR
PANEL
TIME
BASE
OUT
TO
COUNTER
INPUT
OISPLAY
05.0000
RANGE.
..
258-5U
MHz
XX.X.X.X
X
DECI::M
POINT
010
}
EXPAND
X100
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