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HP 8901B Service Manual page 282

Modulation
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VOLTMETER
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A U D I O C I R C U I T S
AF I N P U T
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AM DEMODULATOR
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LOCAL O S C l LLATOR
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HF V C O
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TO
COUNTER
40-80 MHz
LOW FREOUENCY
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SAMPLER
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JNE
@
2
MHZ
t 6 . 2 5 kHz
RF
INPUT
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INSTRUMENT BUS
FROM CONTROLLER
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# - -
HF V C O TUNE
INTEGRATOR
AN0 AMPLIFIER
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D I G I T A L BLOCK
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1
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HF V C O
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-
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TUNE
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11
SWEEP UP
11
CURRENT
TRACK LOOP
SOURCE
AMPLIFIER
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A
STOP SWEEP
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LEVEL
TO
VOLTMETER
T H I S PAGE
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. T I M E BASE
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HF V C O
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FM
CAL
INSTRUMENT BUS
TO/FROM CONTROLLER
KEYBOARO AN0 OISPLAY
7
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INSTRUMENT BUS
FROM CONTROLLER
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REMOTE CONTROL
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1
RF
SWITCH 1
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AUDIO
OISTORTION
,
€VEL
RF
LEVEL
I F OUT
r - - - - -
5 0
Mnz
OECOOERS
L - - _ - - - l
OUTPUT
LATCHES
POWER REF
OSCILLATOR
-
I I
, -
AM AND
FM
C A L I B R A T O R S
I I
AMPLIFIER
I - -
-
I
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AM C A L
I
BRATOR
P
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-
A M
TO
CALIBRATION
VOLTMETER
T H I S PA6E
OIGITAL-TO-ANALOG
CONVERTERS
4
RF PUR/
SENSOR
RESISTOR
,
T H I S
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PAEE
I I
I I
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I
-
FM
C A L I BRATOR
-
AMPLITUOE
FM SOURCE
1 0 . 1 MHZ
L I M I T E R
-
FM
C A L I BRATOR
-
AMPLITUOE
FM SOURCE
1 0 . 1 MHZ
L I M I T E R
I
AM/FM
OUTPUT
V
I/O
ROM CONTROL BUS
0
E
c
0 0
E R
s
AN0
LATCHES
T O
H P - I 0
CONNECTOR
(REAR PANEL1
Y
MICROPROCESSOR
r
T E S T
7
REMOTE
OATA BUS
0
C
I
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BATTERY
- 4
L I N E
I
FUSE
- 4
AOORESS BUS
- 4
L I N E
-,.--@
INPUT
-
MEMORY
M O M AND RAMI
T
JF
RMS LEVEL
(OPTION 030
SERIES ONLY)
OVERPONER
PROTECT
STATUS
AMPLIFIER
OVERPOWER
STATUS
OECOOERS
DECOOERS
AN0
AN0
LATCHES
LA T C H E
S
I
I
BD3
I
I
INSTRUMENT BUS
T O I F R O M CONTROLLER
INSTRUMENT BUS
FROM CONTROLLER
BD2

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