Bird Technologies 8141 - Manual (Page 21)

with an accuracy of one percent or better at 50 ohms for this
purpose.
If the load is used frequently, daily to weekly, it would be
wise to check the resistance on a monthly schedule. If how-
ever, the load is used more infrequently you may want to set
up a six month to yearly schedule accordingly. If there is no
change or even a slight change in dc resistance there is no
cause for alarm, however, if there is a drastic change
greater than two ohms, this could be an indication of a fail-
ing load.
These tests are by no means a dire necessity to the opera-
tion of the load but merely guidelines for the users informa-
tion and advisement.
Disassembly
There are no special techniques required for the repair or
replacement of components. A screwdriver is the only tool
needed. The following paragraphs outline component re-
moval.
RF Input
Connector
The input connector is a “Quick-Change” design which per-
mits easy interchange with the use of only a screwdriver.
This process does not interfere with the essential coaxial
continuity of the load resistor’s RF input or the coolant oil
seal. For replacement, proceed as follows:
a. Remove the four 8-32 x 5/16 inch pan
head machine screws from the corners
of the RF connector.
b. Pull the connector straight out of its
socket.
Coolant Oil
& Diaphragm
To examine the coolant oil and diaphragm, remove the dia-
phragm cover. Proceed as follows:
a. Stand the load vertically, with the
back end up.
b. Loosen the clamp screw to release the
clamping band.
11
Maintenance