Chapter 7 Installation
Preparation for Use
Operating and Programming Manual 121
Selecting Line Voltage and Fuse
Before Plugging This Instrument into the Mains (line) voltage, be sure
the correct line voltage and fuse have been selected. You must set the
voltage selector turret wheel correctly to adapt the 5071A to the power
source as described in the following paragraphs.
The 5071A is equipped with an ac-power module (on the rear panel)
that contains a turret wheel selector to select 100-, 120-, 220-, or 240
volt ac-operation as shown in Figure 7-1. Before applying ac power to
the 5071A, the turret wheel selector must be set to the correct position
and the correct fuse must be installed as described in the following
paragraphs.
Appropriate power-line connections are selected by the position of the
plug-in turret wheel in the module. The correct-value fuse, with a 250-
volt rating must be installed before the turret wheel is inserted. This
instrument uses a 1.5A slow-blow fuse (part number 2110-0304) for
100/120-volt operation and a 0.75A slow-blow fuse (part number 2110-
0360) for 200/240-volt operation.
To change the line voltage, first disconnect the ac-power cord from the
module and then follow the instructions in Figure 7-1.
Figure 7-1. Line Voltage and Fuse Selection with Power Module
Turret Wheel
SELECTION OF OPERATING VOLTAGE
1. Using a small, flat-head screwdriver,
snap open the power module door to access
the fuse and turret wheel.
2. REMOVE the turret wheel before
turning to desired voltage. DO NOT turn
turret wheel while installed in module.
Push wheel firmly into module slot.
3. To change or install fuse, pull fuse
holder and re-insert fuse in holder, using
caution to select correct fuse value. Re-
insert fuse and holder.
4. Close the power module door. The
selected operating voltage is shown in
module window.
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