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494A1494AP
Service
Vot.
I
Page
Section
7
THEORY
OF
OPERATION
(Conr)
Fast
Retrace
Blanking
...,.,...
742
Memories
........7-47
DEFLECTION
AMPLIFIERS
..........
7-47
Horizontal
Section
...............,...
747
Vertical
Section
....249
Z.AXIS
AND
RF
INTERFACE
.......
7-48
RF
Interface
Circuits
................
7_49
Z-Axis
Circuits
.....7_49
power-Fail
Detector
.................
7-50
power
Supply
Monitor
.............
7_50
Options
Switch
.....
7-50
Timer
.........
..........
7_50
HIGH.VOLTAGE
SUPPLY
.............
7.50
High-Vottage
Osciilator
............
7-50
Voltage
Doubter
... 7_SO
High-Voltag€
Regulator
............
7_S0
Z_Axis
Gtipper
......
7_51
cRT READOUT
............................
7_51
Generating
Readout
.................
Z_51
R€adout
OnlOtr Timing
.......
Z-S1
Character
Scan ...................
7-Sj
Character
Generator
Timing
.............
z-54
Dot
Defay
.....-..2-54
lnstrument
Bus
Interface
.........
7-56
Control
Port
.........................
7-56
Address/Data
Port
...,...,......
T
-Sz
Frequency
Dot
Marker
.,...........
7_57
FREQUENCY
CONTROL
sEcTtoN
.. 7_60
Sweep
..................
7-60
Span
Attenuator
.......................
Z-60
Center
Frequency
Control ........
7-60
1st
LO
Driver
...........................
7-60
preselector
Driver
....................
Z_60
swEEP
.....................
7-60
Digital
Controt
......7_61
Sweep
Generator
.....................
7_62
Trigger
Circuits
....7-62
Sweep
Output
Circuits .............
7_62
Marker
DAC
.............................
7-63
Sweep
Control
.....
Z_69
Trigger
Control
..................;.....
Z-69
Sweep
Holdoff
.....7-64
Interface
Circuits .....................
7_64
spAN ATTENUATOR
...................
7-65
DigitalControl
......
7-65
lnput
Section
........
7_65
Digital-to-Analog
Converter
.....
7_65
Decade
Attenuator
...................
7_66
Page
lst
LO DRIVER
.........7-67
Digital
Controf
...... 7-6g
Input
Switching
........................
7-69
Oscillator Filter
Switch Driver
.......7-69
Summing Amptifier
...................
7-69
Oscillator Driver
... 7-69
Reference
Suppty ....................
Z-69
Mixer Bias
Driver
.....................
7-69
Programmable
Bias
.................
7-69
PRESELECTOR
DRTVER
..............
7-69
Digitaf
Control
Circuits .............
7-70
Oscillator
Voltage
Processor
...
7-lO
lF
Offset
...............7-21
Summing Amplifi
er
...................
7
-71
Tracking
and
Shaper
Circuits
....7-71
Current
Driver
...... Z-72
Preselector
Switch
Driver
.,...... 7-22
CENTER FREQUENCY
CoNTROL
-................7-72
Operating
Modes
.....................
7
-72
Digital Control
......7-73
Storage
Registers ..,..,.........
7-74
Digital-to-Analog
Converters
.......7-75
Track-and-Hold
Amplifier ......... 7
-7
5
Write-Back
Circuit
........,...........
7-76
-1
0
V Reference
Buffer ......... ..7-76
COUNTER
and
PHASE
LOCK
sEcTroN
...7-77
FUNCTIONAL
DESCRIPTION ....... 7-77
Phase
Lock
Assembly ............. 7-77
Frequency
Gontrol
................... 7
-78
Controlling
the
Oscillator Frequency
......,.,.,
7
-78
Counting
the
lF .................... 7-78
HARMONIC
MIXER ..7.78
AUXILIARY
SYNTHESIZER
.......... 7-79
COUNTER
BOARD
.,,7.82
Address Decoder
.....................
7-82
Service
Request
Circuits
......... 7-82
Data Buffers
.........7-82
Input Amplifiers
and
Multiplexer ........... 7-83
+2n
Gounter .........
7.83
21
-bit
Counter ..........................
7-83
PHASE LOCK
SYNTHESIZER
...,..7.83
Synthesizer ..........
7-83
Phase Lock
.............................. 7-84
Offset
Mixer ........................ 7-84
Error
Amplifier
.....................
7-85
Controlled
Oscillator
............ 7-86
Strobe Driver
Circuit
............ 7-86
vll