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HP 8901B Service Manual page 288

Modulation
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A4 FM DEMODULATOR
ASSEMBLY
,
FM
our
A6 AM DEMODULATOR
ASSEMBLY
>---
I
AUDIO
OVERVOLTAGE
FM SQUELCH
DEMODULATOR
TOlFROM
FM
h
DETECTOR
0D3
STATUS
ABSOLUTE PEAK
I
,
,
f
f
' 2
' 3
rn
/ I
<
Q
A 5 VOLTMETER ASSEMBLY
7 - -
I
7
AUDIO
AVERAGE DETECTOR
7
HALF-WAVE
-
I
TP5
RECT OUT
AUDIO PEAK
S A ~ L E .
BUFFER
DETECTOR
AND-HDLQ
AMPLIFIER
I
PK D E
OUT
CAP
L _ _
14
INPUT
I
SELECTORS
I
0
AUDIO RANGE LEVEL
AUDIO DISTORTION
SERVICE INPUTS
I
7
VOLTAGE-TO-TIME
CDNVERTER-
(NOTE I 1
'
13
I
I
COMPARATOR
I
AUDIO AVERAGE LEVEL
I
- 0 4 -
I
DEMODULATOR
I
' 3
0 D 3
FROM AM
I
0 D 3
'2
- 0 ;
I
I
- 0
I
I
FROM AM
CALIBRATOR
AUDIO PEAK LEVEL
RF PWRJSENSOR TYPE
0 D 2
0
FROM POWER
METER
0 1
RF
L E V E L
0 D 2
-
I
GENERATOR
VOLTAGE
REF
&
TPZ
RAMP GATE
FROM COUNTER
0D5
I
REF
FROM RF
DETECTOR
I
-
OPTION 030 SERIES ONLY
- ,
PRE-RMS OUTPUT
I
FROM I F
AMPLIFLIERI
DETECTOR
DECODER
AN0
LATCH
INSTRUMENT
BUS TOIFROM
CONTROLLER
I
I
I
i
,
J
,
JZ
I
OUTPUT/
- _
- -
- _
_ _
- _
A52 AUDIO C O U ~ T ~ R l D I S T O R T I O N AlALYZER ASSEMBLY
_
_
_ _
w9
--r<+-@-c-(
I
I
1
J2
I
(EXCEPT OPT 0011
RMS-TO-DC
R I P P L E
CONVERTER
F I L T E R
AUDIO INPUT
I
JZ
I w 5 3
I
OUTPUT/
I
AUDIO INPUT/
(OPT
001
ONLY1
L - - _ _ -
AUDIO
A W L
I
DISTORTION
I
our
F I L T E R S
NOTCH
7
AMPLIFIER
2
7
-
w
/
AUDIO COUNTER
,
U
COUNTER
BUFFER
I +
SCHMITT
TRIGGER
COUNTIPULSE
SWITCH I
I
-
COUNTER STAGES
1-4
-
\
+ I 6
CDUNTJPULSE
'16
t16
* I 6
COUNT
OUT
RESET
RESET
RESET
RESET
OUTPUT
SWITCH
2l-c-
AND
I
LATCHES
-
-
AUDIO COUNT
INSTRUMENT BUS
TOIFROM CONTROLLER
0 D 5
a
AUDIO
COUNT
I
I
I
i
BD4
B E - 9

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