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2.7.
3.
3
Use
only
AC
power
outlets
having
a
protective
ground
for
connection
to
the
counter.
DO NOT
USE
2-core extension cords
or
3-prong
to
2-prong adapters
that don't
provide a protective
ground
connection.
Connection
of the
power
cord
to the
power
outlet
must
be
made
in
accordance
with the following standard
color
code:
American
European
Live
Black
Neutral
White
Ground
(Earth)
Green
Brown
Blue
Green/Yellow
2.
7.
3.
4
Also,
all
devices
connected
to
or
in
proximity
with the
1994
must
maintain
the third-wire
ground
(earth) intact as
set forth
in
current
regulations.
2.7.4
Line Fuse
2.7.
4.1
Check
that the rating of the
line
fuse
is
suitable
for
the
AC
voltage range
in
use.
The
fuse should be a 1/4
in.
x
1
1/4
in.,
glass cartridge,
Slow-Blow
type.
Line
voltage settings
of
100 or
120V
should
have
a
0.5
A
Slow-Blow
fuse
installed; settings
of
220
or
240V
should have
a 0.25
A
Slow-Blow
fuse
installed.
2.8
STORAGE AND TEMPERATURE
2.8.1
The
1994 can be
stored
at
temperatures
ranging
from
-40°C
to
+70°C
at
75%
relative
humidity without adverse
effects
to
PCBs
or
components.
The
counter
must
be brought within
its
specified
operating range
of
0°C
to
+50°C
before power-on.
2.9
FUNCTIONAL CHECK
2.9.1
Introduction
2.
9.
1.1
The
following
test
procedure confirms whether
or
not the
1994
is
performing
correctly
by
checking
most
of
the
counter's
circuitry.
The procedure
should be
conducted
when
the
1994
is
first
put
into
service
and
after
shipment
to
a
new
location.
2.
9.
1.2
Now
perform
the following procedure:
a.
Connect
the 1994
to
a suitable
AC
power
supply
b.
Power-on
the counter.
Verify that the instrument
type
number
"1994"
is
displayed
for
about
two
seconds, followed by the
software
issue
number
NOTE:
Home-state
conditions
for
the
1994 are
listed in
Subsection
3.2.3.
Consult
as required.
c.
Press the
FUNCTION
t
key
once; the
CHECK LED
should
light.
Verify
that the display
shows 10.0000000 E6 and
that
the
GATE
LED
flashes
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