COMDYNA GP-6 - Page 4

OPERATOR'S
&
MAINTENANCE
MANUAL
page
2.
The
following
are
procedures
for
input
scaling
adjustments:
1.
Position the
MODE
SELECTOR switch to OPR.
2.
Depress the IC mode control push button.
3.
Position both the Y/POT ADDRESS and X ADDRESS switches to GND.
4.
Adjust the
plotter or oscilloscope X and Y zero controls until plotter's pen or oscilloscope's dot
is
the the graph or display center.
5.
Position the Y/POT ADDRESS and X ADDRESS switches to -REF.
6.
Adjust the plotter or oscilloscope X and Y gain controls until the pen or dot
is
the pen
or dot negative full scale deflection.
7.
Position the Y/POT ADDRESS and X ADDRESS switches to
+
REF.
8.
Check the pen or dot.
It
should be the positive
full
scale deflection.
9.
Repeat the procedures if necessary.
The
readout
instruments
will
either
plot
or
display
an
amplifier
output
as
a
function
of
time
or
of
another
amplifier
output,
as
selected
by
Y
and
X
ADDRESS
switch
positions
(para
1.5.)
Regarding
time
functions,
zero
time
begins
at
the
negative
full
scale
deflection
and
sweeps
to
positive
full
scale,
where
the
positive
full
scale
deflection
equals
the
compute
time
period
(para.
1.3.)
If
the
oscilloscope
internal
time
base
is
used
for
the
repetitive
operation
display,
the
fast
time
scale
ratio
of
400:
1
must
be
considered:
one
computer
time
second
equals
2.5
milliseconds
real
time.
1.2
SETTING
COEFFICIENT
POTENTIOMETERS
Coefficients
are
set
in
a
potentiometer
setting
mode
where
a
setting
is
displayed
by
the
digital voltmeter
and
a
selected
potentiometer
is
adjusted
until
the
desired
setting
is
observed.
Setting
procedures
are:
1.
Complete all patching
so
that settings are made under their operating loads.
(If
pots 7
and 8 are to be used
as
normal attenuators, check to assure that their bottom ends are
patched to ground.)
2.
Position the
MODE
SELECTOR switch to POT SET.
3.
Position the Y /POT ADDRESS switch to the number of the pot to be set.
4.
Adjust the pot knob until the desired setting
is
displayed.
1.2.1
Effects
of
Amplifier
Overrange
An
amplifier
overrange
will
alter
the
setting
of
any
pot
patched
to
the
overranged
amplifier
input.
If
the
overload
alarm
appears
when
the
POT
SET
mode
is
selected,
remove
the
overrange
condition
by
patching
overranged
amplifier
outputs
directly
to
their
summing
junctions.
Be
sure
to
remove
these
patch
cords
prior
to
running
the
program.
1.3
SETTING
THE
COMPUTE
TIME
PERIOD
The
Compute
Time
Period
is
the
time
taken
by
the
internal
time
base
to
sweep
from
minus
to
plus
reference.
It
is
the
full
scale
X
axis
co-
ordinate
of
plotted
or
displayed
time
response
curves.
It
is
adjustable
from
1
O
to
approximately
100
computer
time
seconds
by
the
COMPUTE
TIME
control.
Setting
procedures
are:
1.
Position the
MODE
SELECTOR switch to POT SET.
2.
Position the Y/POT ADDRESS switch to GND/X.
3.
Position the X ADDRESS switch to CTP.
4.
Adjust the COMPUTE TIME control until the desired compute time period divided
by
100
is
displayed. (The display for a compute time period of
20
computer time seconds
will show .200)
------------------------------------COM
DYNA,
INC.