Bird Technologies 4412A - Manual (Page 25)

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Chapter 4 Maintenance
The Series 4410 Thruline Wattmeter is of very rugged construction and requires
little care and maintenance.
Maintenance of the wattmeter is normally limited to cleaning. The amount of
cleaning necessary can be minimized by keeping the plug-in element or the ship-
ping slug in the socket of the line section. This serves as an effective seal against
the entry of dust and dirt. Cover the socket opening when the element is
removed. Also, protect the RF connectors on the line section against the entry of
dust and dirt by keeping them connected to the transmission line or by covering
them when the unit is disconnected from the transmission line.
Care and Cleaning
All contacts must be kept clean to assure low resistance connections to, and
within, the unit.
RF Connectors
Clean RF connectors with a cotton swab stick dampened with alcohol, or any
acceptable dry cleaning solvent.
Line Section & Plug-In Element
Clean the inside of the line section socket bore and the entire circumference of the
plug-in element with a cotton swab stick dampened with alcohol, or any dry clean-
ing solvent that does not leave any residue. Pay particular attention to the cleaning
of the bottom rim of the element body and to the seat of the socket in the line
section. When cleaning the socket bore, take care not
to disturb the spring finger of
the DC contact.
Adjustments
If necessary, the spring finger of the DC contact can be adjusted manually. The but-
ton must be positioned out far enough to make good contact with the element body,
but it must not restrict the entry of the element body. Check the inside of the line
section for dirt and contamination. Clean the reachable portions of the line section
with a cotton swab stick. Blow out the remaining dirt with low pressure, dry com-
pressed air. Do not attempt to remove the RF line center conductor from the line
section. Any attempt to remove it will damage the assembly.