Bird Electronic 4314B, Operation Manual

Page: 24 / 48

Bird Technologies
12
Plug-In Element Selection and Insertion
The elements determine the power range to be read on the meter scale.
The major markings (50 W, 100 W, etc.) are the full scale power value
for that element. Elements are also marked for frequency range. The
transmitter frequency must be within the band of the element used.
z
RF power measurements are made with the insertion of a
Plug-In Element. Insert the element into the line section’s
receptacle.
z
Forward power is indicated when the arrow on the element
points in the direction of power flow; from transmitter to load.
Reflected power measurements are made with the element
rotated 180 and the arrow pointing towards the transmitter.
Note:
The element must be rotated fully when power mea-
surements are being made.
The index pin protruding from the element’s body should rest against
the stop on the line section in both the forward and reflected position.
The small catch in the lower left hand corner of the casting face should
press down on the shoulder of the Plug-In Element. This will keep the
Plug-In Element in proper alignment and insure good contact with the
dc pickup, the lower edge of the element and the line section body.
Measurements
CW Power Measurements
1. Set the wattmeter controls to the ON and CW modes
2. Read the appropriate meter scale corresponding to the element
full-scale value.
Peak Power Measurements
1. Set the ON/BATTERY switch to the BATTERY mode.
Note:
If the pointer of the meter indicates below the battery
test zone, the batteries must be replaced. See “Replacing the
Batteries” on page 26.
2. Set CW/PEAK switch to PEAK mode.
3. Read the appropriate meter scale corresponding to the element
full-scale value.