SECTION 3
Front Panel Operation
3.1 INTRODUCTION
This section contains the detailed information necessary
to use the insttument from the front panel. These opera-
tions (except for IEEE-488 address selection and fre-
quency for line integration) can also be programmed
over the IEEE-488 bus, as described in Section 4.
3.2 POWER-UP PROCEDURE
3.2.1
Line Voltage Setting
Figure 3-1.
The instrument is designed to operate from 10.512%’ or
210-25OV line power ranges. A special transformer may
be installed (at factory) for 90-IlOV and lSC-220V ranges.
The operating voltage that the instrument is configured
to operate at is indicated on the line voltage slide switch
located on the rear panel (see Figure 3-l). The required
switch positions for the available line voltages are sum-
marized in Table 3-l. If the line voltage setting needs to
be changed, proceed as follows:
3.2.2 Fuse Replacement
A rear panel fuse located adjacent to the line voltage
switch (see Figure 3-I) protects the power line input of
the instrument If the fuse needs to be replaced (line volt-
age switch sethg changed or suspected blown fuse),
perform the following steps:
Table 3-l. Line Voltage Selection (5LMOHz)
Voltage Selection
Line Voltage
Switch Position
I
I105-125v I
115v
I
WARNING
Make sure the Model 486/487 is discon-
nected from the power line and all other
equipment before proceeding.
1. Locate the line voltageswitch on the rear panel (see
Figure 31). Place the blade of a screwdriver into slot
2.
in the switch slot and slide it over to the alternate po-
sition.
Install a fuse consistent with the operating voltage,
as described in the next paragraph.
Line Voltage Switch and Line Fuse
1.
2.
WARNING
Make sure the instrument is disconnected
from the power line and other equipment
before replacing the fuse.
With the power off, place the end of a flat-blade
screwdriver into the slot in the rear panel line LINE
FUSE holder. Push in gently and rotate the fuse car-
rier one-quarter turn counterclcckwise. Release
pressure on the holder and its internal spring will
push the fuse and carrier out of the holder.
Remove the fuse and replace it with the type recom-
mended in Table 3-2.
CAUTION
Donotuse afusewithahighercurrentrating
than specified, or instrument damage may
occur. If the instrument repeatedly blows
fuses, locate and correct the cause of the
trouble before replacing the fuse. See the
maintenance section for troubleshooting in-
formation.
3-1
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