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HP 3465B - Page 21

HP 3465B
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Model
3465B
Section
IV
CLOCK
(lOOkHz)
DIGIT
ACTIVATION
TO
DISPLAY
BCD
OUT
TO
DISPLAY
SCAN
TXFR
COUNT
'EXTEND
RESET
DIGIT
SELECT
DECODER
BUFFER
BUFFERS
COUNTER
MULTIPLEXER
LATCHES
3'»65-e'4l74
Figure
4-8.
Data
Accumulator.
derived
from
Vg
and
the
+
II
V
output
of
the
power
supply.
A
series
voltage
regulator,
Q21,
Q22
and
Q23
maintains
the
+
3
V
output
constant.
This
provides
con
stant
display
intensity
for
changes
in
the
magnitude
of
Vg
due
to
battery
life
and
results
in
low
power
consumption
for
a
high
Vg
(new
or
recharged
batteries).
4-71.
Twenty-five
connections
interface
the
display
and
the
main
assembly.
Table
4-1
indicates
each
terminal
and
the
source
of
the
signal
from
the
main
assembly.
Table
4-1.
Display
Interface
Connections.
CONNECTION
DESIGNATION
SOURCE
OF
SIGNAL
DIGIT
STROBES:
MSD,
2MSD,
3MSD,
LSD
BCD:
1,2,4,8
DATA
ACCUMULATOR
(A1U11)
DECIMAL
POINT:
A,
B,
C,
D
RANGE
SWITCHES
FUNCTION
SWITCHES
POLARITY
ENABLE:
PE
POLARITY:
PL
A1U4
LOGIC
SECTION
OVERRANGE:
OR
OVERLOAD:
OL
A1U5
A1U6
TRANSFER:
TR
-rVg,
-HI
V,
GND,-7
V
POWER
SUPPLY
PIN
25
NO
CONNECTION
4-9

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