Model 740B
IJ============================MAI~ L O O P = = = = = = = = = = = = = = = = = = = = = = = = = = = = > I
Section
vn
---======REFERENCE========;J
Ir
LOOP
LOW VOLTAGE
v========
SECTION
=========>1
-=================HIGH
VOLTAGE================~
Ir
SECTION
~
AI3
54-58
59
0-1
PIO A4
0-1
~
PIO
A5
PIO
A7
PULSE
KI
IDC OUTPUTI
BI NARY CODED
STEP
~
PIO
AI7
PIO
AI7
f - -
OPERATIONAL
~
DIFFERENTIAL
PULSE WIDTH
t - - -
POWER
-
POWER
-
TRANSFORMER
-
FILTER
-<~
OUTPUT
f-;~
REFERENCE
f - -
t - - -
-v
OUTPUT
Ho.'OOO
DECIMAL
VERNIER
MODULATOR
DEMODULATOR
SWITCH
SWITCH
FIL TER
VDC
SUPPLY
AMPliFIER
FILTER
AMPliFIER
CONVERTER
DR IVER
a
RECTIFIER
CONTROL
DIVIDER
CONTROL
u
r0-
o
>
6
PIO
A3
PIO
A5
ZERO
OVERLOAD
SET
DETECTOR
20KHZ CLOCK
I
I
I
H.V.
I
O-IVDC
SECTION
O-IOOOVOC
I
FEEDBACK
I
DIVIDER
I
I
MAIN LOOP
I
FEEDBACK
DIVIDER
1I000vi
0-1000 VDC
l'ooV
I
~
c::JL]
METER
~
LOOP
~
' < ;;.' 7
............
I'....
59
STEP
VERNIER
CONTROL
7408-0-0727A.
o TO O.IVDC
SI
I
5TD
I
METER
FIL TER
PIO
AI6
NODULATOR
PIO
AI6
DEMODULATOR
01794-1
Figure 7 -2. DC Standard Block Diagram
7-5
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