Bird Technologies 8890-400 Series - Manuale (Pagina 32)

Cleaning
The most important cleaning task is to remove accumula-
tions of dust, lint, and grime that could interfere with
proper air circulation and therefore efficient heat transfer.
The cooling fins should be checked periodically for possible
collection of dust and lint. When cleaning is necessary, fol-
low these instructions.
Preparation:
s Material: Lint-free cleaning cloth
s Mild detergent
Outside
Surfaces
The outside surface of the instrument should be wiped free
of dust and dirt when necessary. Excessive collection of dust
and lint on the cooling fins will interfere with the efficient
dissipation of heat. Clean the RF input connector with a
self-drying, non-residue forming contact cleaner. Take spe-
cial care to clean the metallic contact surface and the ex-
posed faces of the teflon insulator.
It is particularly important to keep the following areas
clean:
s Mating surfaces of the socket and plug-in ele-
ment including; the bore of the socket, and the
circumference of the element body.
s Bottom rim of the element body and the seat
of the socket in the line section.
s The ends of the insulated dc contacts on the
element. The ends should be clean and
smooth.
Inspection
Periodically perform the following checks:
s Make sure all connections are clean and tight.
s Disconnect the RF power and check the zero
setting without power, adjust if necessary.
s Inspect around the clamping band of the con-
nector and also around the thermoswitch, for
signs of possible coolant leakage.
s Check the connector assembly for tightness.
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Bird Model 8890-400 Series Termaline Wattmeter