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DATA PRECISION 5740 - Theory and Principles of Operation; General System Overview; Simplified Block Diagrams; Frequency Measurement Block Diagram

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72-1002
Model
5740
COUNTER
3.1
GENERAL
THEORY
and
PRINCIPLES
of
OPERATION
The
Model
5740
MULTIFUNCTION
ELECTRONIC
COUNTER
comprises
a
counter-latching
register-display
chain,
an
input
signal
conditioning
circuit,
a
crystal-controlled
time
base,
programmable
digital
control
circuitry,
and
the
necessary
regulated
and
filtered
power
supplies.
Operation
of
two
front
panel
switches
sets
up
the
instru
ment
for
one
of
four
measuring
modes.
The
5740
:
Measures
FREQUENCY
of
Input
Signal
in
Kilohertz
Measures
PERIOD
of
Input
Signal
in
Microseconds
Counts
Time
in
SECONDS
Totalizes
EVENTS
in
Units
Operation
of
the
instrument
for
each
function
is
explained
with
the
aid
of
sim
plified
block
diagrams
for
each
function.
Complete
schematics
are
reproduced
and
bound
in
the
rear
of
the
book
and
should
be
referenced
when
the
theory
of
operation
of
each
module
of
the
instrument
is
de
scribed
.
3.2
SIMPLIFIED
BLOCK
DIAGRAMS
3.2.1
Measuring
FREQUENCY
As
shown
in
Figure
3-1,
when
slide
switch
S4
is
in
the
SECONDS/FREQUENCY
po
sition,
the
input
signal
is
gated
to
the
Counter-Latch-Display
chain,
and
the
IMHz
time
base
is
gated
to
the
Programmable
Divider.
The
selected
position
of
rotary
switch
S3
sets
up
the
divider
for
a
GATE
TIME
base
of
10msec,
100msec,
Isec,
or
lOsec,
while
simultaneously
positioning
the
decimal
point
in
the
display
to
the
appropriate
decade.
INPUT
SIGNAL
CONDIT
MODE
COUNT
GATE
GATE
Tf
S
F
-4
4
«
^
10
1
1
MHZ
MHZ
MODE
GATE
PROGRAM.
DIVIDER
GATE
TIME
"n
S3
I
SYNCH
START
MEASURE
INTERCYCLE
CONTROL
T
Fig.
3-1.
Model
5740
FREQUENCY
Measurement
Simplified
Block
Diagram
COPYRIGHT
197S
DATA
PRECISION
CORPORATION.
PRINTED
IN
THE
U5.A.
3
1