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SECTION 3
Operation
2. If the switch setting was changed, install a fuse con-
sistent with the operating voltage as described in the
next paragraph.
3.3.2
Fuse Replacement
A rear panel fuse located inside the AC LINE receptacle
is used to protect the power line input of the instrument.
If the fuse needs to be replaced (line voltage switch set-
ting changed
or blown
fuse), perform
the following
steps:
WARNING
Make sure the instrument
is disconnected
from
the power
line and other
equipment
before
replacing the fuse.
1. Using a flat-blade
screw driver, pry open the fuse
drawer as shown in Figure 3-4.
'igure 3-4. Fuse Replacement
2. Remove the fuse from the fuse clip. Notice that there
is a spare fuse in front of it.
3. Replace the fuse with the following type:
Line
I----
Voltage
1oov/12ov
22OV/24OV
Fuse Rating
0.4A
0.5A
0.2A
0.25A
CAUTION
Do not use a fuse with a higher current rating
than specified, or instrument
damage may occur.
4. Push the fuse drawer back into the receptacle.
3.3.3
Power Cord
Connect
the female end of the power cord to the AC
receptacle
on the rear panel of the instrument.
Connect
the male end of the cord to a grounded AC outlet.
WARNING
The
instrument
is equipped
with
a 3-wire
power cord that contains a separate ground wire
and is designed to be used with grounded
out-
lets. When proper connections
are made, instru-
ment
chassis
is connected
to the power
line
ground.
If the AC outlet is not grounded,
the
rear panel safety earth ground terminal must be
connected to a known safety earth ground using
#18 AWG (or larger) wire.
CAUTION
Be sure that the power line voltage agrees with
the
indicated
voltage
of the
LINE
SUPPLY
switch. Failure to observe
this precaution
may
result in instrument
damage not covered by the
warranty.
3.3.4
Power Up Sequence
To turn on the instrument,
depress the POWER button.
During the power up cycle, the unit will perform
the
following:
1. All annunciators
and display segments
will turn on
for a few seconds. This allows you to check for defec-
tive indicators or display digits.
2. The
revision
level
of the firmware
is displayed
briefly on the IAl DISPLAY. For example:
-l.lO-
3. The
self-check
on
memory
elements
and
self-
calibration
of internal circuits are performed.
During
this
eriod, the "CAL" message will be displayed
on
the b A
DISPLAY and a countdown
from 7 to 0 will
take place on the m
DISPLAY. Any errors that
occur are denoted by error messages
on the display.
Table 3-6 explains the error messages.
4. The unit will begin normal operation in accordance
with the power-up
configuration
discussed
in the
next paragraph.
3-8
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