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1
2
3
I .
Display:
Seven-segment
light
emitting
diode,
10.9
mm
(0.43
inches)
high;
14
characters,
each
with
decimal
point.
2.
ON
Indicator:
When
illuminated,
indicates
instrument
has
primary
power
(+5V
dc)
applied.
The
+5V
dc
power
on-of
switch
is
on
the
rear
panel.
3.
LISTENING
Inidicator:
When
illuminated,
indicates
that
characters
will
be
accepted
for
display.
4.
OVERFLOW
Indicator:
When
illuminated,
indicates
that
the
14-digit
capacity
of
display
has
been
exceeded.
The
most-significant
information
(digits)
has
been
lost.
5.
CHECK
Switch.
When
pressed,
illuminates
all 14
digits
a s
character
"8"
along
with
all
deci-
mal
points.
This
tests
all
segments
and decimal
points
in
the
display.
The
CHECK
function
also
tests the
LISTENING
and
OVERFLOW
indicators.
6.
Interchangeable
panel
label
to denote
measurement
data.
In
this
case,
the
data
could
repre-
sent
Z-Axis
measurements.
Figure
4-9.
70783A
Numeric
Display
Front
Panel
Indicators
4.20
Initial
Power
Application
WARNING
BEFORE
PERFORMING
THE
FOLLOWING
STEPS,
BE
SURE
THAT
ALL
SYSTEM
ITEMS
THAT
ARE
CONNECTED
TO
A N
AC
POWER
SOURCE
HAVE
A
C O M M O N
EARTH
CROUND
CONNECTION.
IT
IS
POSSIBLE
TO
HAVE
A
DIFFERENCE
IN
ELECTRICAL
POTEN-
TIAL
BETWEEN
THE
VARIOUS
SYSTEM
COMPONENTS
IF
A
C O M M O N
CROUND
IS
NOT
ENSURED. THIS
CONDITION
CAN
CAUSE
INJURY
TO
OPERATING
PERSONNEL
AND/OR
CAUSE
DAMAGE
TO
THE
SYSTEM
COMPONENTS.
ALSO,
BE
CERTAIN
THAT
ANY
SURROUNDING
EQUIPMENT,
SUCH
AS
A
MACHINE
TOOL,
HAS
THE
SAME
C O M M O N
GROUND
FOR
ITS
POWER
SOURCE
AS
THE
LASER
SYSTEM
GROUND.
If
the
system
does
not
have
a
separate
master
power
on/off
switch,
power
is
applied
to
all
units
when
the
individual
power
supplies
are
connected
to
line
power
(refer
to
Section
V).
For
convenience,
it
is
recommended
that
all
power
cords
be
routed
through
a
master
power
ON/
OFF
switch.
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