5520A
Operators Manual
2-4
2-3. Replacing the Fuse
CAUTION
To prevent possible damage to the instrument, verify the
correct fuse is installed for the selected line voltage setting
100 V and 120 V, use 5.0 A/250 V time delay (slow blow); 200 V
and 240 V, use 2.5 A/250 V time delay (slow blow).
The line power fuse is accessible on the rear panel. The fuse rating is 5 A/250 V slow
blow fuse for the 100 V/120 V line voltage setting; 2.5 A/250 V slow blow fuse for the
220 V/240 V line voltage setting. Fuses that are not user replaceable are discussed in
Chapter 7, “Maintenance.”
To check or replace the fuse, refer to Figure 2-1 and proceed as follows:
1. Disconnect line power.
2. Open the fuse compartment by inserting a screwdriver blade in the tab located at the
left side of the compartment and gently pry until it can be removed with the fingers.
3. Remove the fuse from the compartment for replacement or verification. Be sure the
correct fuse is installed.
4. Reinstall the fuse compartment by pushing it back into place until the tab locks.
2-4. Selecting Line Voltage
The calibrator arrives from the factory configured for the line voltage normally
appropriate for the country of purchase, or as specified at the time of your purchase
order. You can operate the 5520 A Calibrator from one of four line voltage settings:
100 V, 120 V, 200 V, and 240 V (47 Hz to 63 Hz). To check the line voltage setting,
note the voltage setting visible through the window in the power line fuse compartment
cover (Figure 2-1). The allowed line voltage variation is 10% above or below the line
voltage setting.
To change the line voltage setting, complete the following procedure:
1. Disconnect line power.
2. Open the fuse compartment by inserting a screwdriver blade in the tab located at the
left side of the compartment and gently pry until it can be removed with the fingers.
3. Remove the line voltage selector assembly by gripping the line voltage indicator tab
with pliers and pulling it straight out of its connector.
4. Rotate the line voltage selector assembly to the desired voltage and reinsert.
5. Verify the appropriate fuse for the selected line voltage (100 V/120 V, use 5 A/250
V slow blow; 220 V/240 V, use 1.25 A/250 V slow blow) and reinstall the fuse
compartment by pushing it back into place until the tab locks.
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