It is important to keep the following surfaces clean:
s
Socket bore
s
Element body circumference
s
Bottom rim of the socket in the line section
s
DC contacts on the element
The outside surface of the meter housing can be cleaned with a soft cloth
dampened with a mild detergent solution. Do not wipe the meter glass with
a dry cloth, a static charge could develop causing an erroneous indication on
the meter.
Preventive Maintenance
The element socket should be kept plugged as much as possible to prevent
the intrusion of dust, and to prevent damage to the meter. Use the dummy
plug provided, or use an Element. When an Element is used for this purpose,
use the highest power element available. It should be positioned with the
arrow pointing upwards (midway between the FWD and RFL measuring
positions). This protects the meter and will not expose the element diode to
dangerous potentials if the RF line section should be energized.
Line Section Care
If there is any evidence of contamination inside the RF line section, the
reachable portions should be cleaned and the interior carefully blown out.
Under no circumstances attempt to remove the RF center conductor. It is
tightly frozen in place and any attempt to remove it will ruin the assembly.
Keep all connections tight, and keep the nut of the meter cord plug turned
tight on the line section dc jack. This connection may often be serviced by
simply loosening the nut of the dc plug, swinging the body several times
through a fraction of a turn, and retightening the knurled nut securely.
Contact Adjustment
In cleaning the socket bore, the operator should be careful not to disturb the
spring finger of the dc contact. It is important that the operating position of
Maintenance
33
Summary of Contents for THRULINE 43 Series
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