COMDYNA GP-6 - Page 22

OPERATOR'S
&
MAINTENANCE
MANUAL----------------------------,
page
A7
933.4
MODE
CONTROL
AND
TIME
BASE
ASSEMBLY
Mode
control
is
a
push
button,
four
stage,
two
pole,
double
throw
interlocked
switch.
Each
station
places
a
system
into
one
of
four
integrator
modes:
Initial
Condition
(IC)
Hold
(HD)
Operate
(OP)
Repetitive
Operation
(RO)
To
produce
the
above
modes,
it
is
necessary
to
control
the
OP
Bus
voltage
(mode
logic,)
the
Time
Scale
Relay
Bus
(slow
or
fast
integrator
time
scales,)
and
the
repetitive
operation
timing
circuit
(slow
or
fast
time
base
ramp.)
Referring
to
the
circuit
diagram,
the
following
is
a description
of
the
four
modes:
Initial
Condition
...
Time
Scale
Relay
Bus
energized
(see
Repetitive
Operation.)
The
OP
Bus
pulled
to
ground.
Hold
...
Time
Scale
Relay
Bus
energized.
The
OP
Bus
pulled
to
the
hold
voltage
state
(approximately
-1.
7v.)
Input
to
the
time
base
integrator
disconnected
(see
Time
Base
Circuits.)
Operate
...
Time
Scale
Relay
Bus
energized.
The
OP
Bus
released
to
the
operate
voltage
state
(less
than
-Sv.)
Repetitive
Operation
...
Time
Scale
Relay
Bus
de-energized.
The
OP
Bus
switched
from
the
slow
time
modes
(IC,
HD,
OP)
to
the
repetitive
operation
logic.
Time
Base
Circuits
...
The
time
base
integrator
(amplifier
B)
provides
both
the
slow
and
high
speed
repetitive
operation
time
bases,
both
linear
sweeps
from
negative
to
positive
1
Ov
reference.
The
input
originates
from
amplifier
A
which
is
externally
programmed
to
provide
an
adjustable
voltage
in
the
range
of
-1
v to
-1
Ov.
(A
1 volt
input
produces
a
compute
time
period
of
100
sec;
a
-1
Ov
input
produces
1 O
sec.
The
time
base
integrator
circuit
is
the
same
as
that
of
the
911
general
purpose
integrator.
Please
see
the
911
data
sheet
for
the
circuit
descriptionc.)
When
OP
is
depressed,
the
output
of
A
is
directed
through
the
HD
switch
to
R22
to
produce
an
integration
rate
of
2
volts/sec;
when
RO
is
depressed
the
input
is
R23
and
the
rate
is
800
volts/sec.
Also,
when
RO
is
depressed
the
monostable
circuit
of
amplifiers
C
and
D
becomes
the
OP
Bus
and
thus
the
repetitive
operation
mode
control,
(the
time
constant
of
C4-R18
producing
an
initial
condition
state
of
approximately
2
milliseconds.)
Capacitors
C1
and
C2
with
resistors
R1
and
R2
decouple
amplifiers
C
and
D
to
eliminate
power
supply
disturbance.
For
the
amplifier
A
Compute
Time
Period
programming,
please
refer
to
section
2.0
of
the
GP-6
operator's
manual.
Adjustments
Slow
time
and
repetitive
operation
time
base
rates
are
adjusted
with
potentiometers
P1
and
P2.
Both
are
adjusted
to
match
patch
panel
integrator
time
constants.
Program
a
patch
panel
amplifier
as
an
integrator.
Apply
positive
reference
as
an
initial
condition.
Patch
negative
reference
to
a
coefficient
potentiometer
and
patch
the
wiper
to
a
gain
1
input.
Set
the
potentiometer
to
.200.
The
integrator
will
then
sweep
from
negative
to
positive
reference
in
a 1 O
unit
(second)
period.
Slow
Time
Adjustment.
..
Observe
(with
an
XY
recorder
or
oscilloscope)
the
slow
time
output
of
the
patch
panel
integrator
as
a
function
of
the
time
base.
Adjusts
potentiometer
P1
until
the
function
passes
through
the
positive
reference-positive
reference
coordinate
(
+
10,
+
1
O.)
Repetitive
Operation
Adjustment
...
Repeat
the
above
procedure
observing
the
entire
integrator
output
on
the
X-Y
oscilloscope.
Adjust
potentiometer
P2
until
the
oscilloscope
trace
passes
through
the
+
1
o,
+
1 O
coordinate.
-----------------------------------COM
DYNA,
INC.