Maintenance
Cleaning the Air Filter
7
7-5
7-3. Cleaning the Air Filter
Warning
To avoid risk of injury, never operate or power the 5520A
calibrator without the fan filter in place.
CAUTION
Damage caused by overheating may occur if the area around
the fan is restricted, the intake air is too warm, or the filter
becomes clogged.
The air filter must be removed and cleaned every 30 days or more frequently if the
calibrator is operated in a dusty environment. The air filter is accessible from the rear
panel of the calibrator.
To clean the air filter, refer to Figure 7-2 and proceed as follows:
1. Turn off the power, let the fan come to rest, and unplug the ac line cord.
2. Remove the filter element.
a. Grasp the top and bottom of the air filter frame.
b. Squeeze the edges of the frame towards each other to disengage the filter tabs
from the slots in the calibrator.
c. Pull the filter frame straight out from the calibrator.
3. Clean the filter element.
a. Wash the filter element in soapy water.
b. Rinse the filter element thoroughly.
c. Shake out the excess water, then allow the filter element to dry thoroughly
before reinstalling it.
4. Reinstall the filter element by performing the filter removal steps in reverse order.
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