Bird Technologies 4308 - Manual (Page 21)

Chapter 4
Operating Instructions
A description of the features of the Thruline Wattmeter have been discussed in the
previous sections. Read and become familiar with the following instructions before
operating the Model 4308. As mentioned, no batteries or external power sources are
required to operate the meter. A small but sufficient amount of power is obtained from
the transmission line into which the unit is connected.
Zero Adjust
Before applying any RF power, check to see that the meter pointer is set at zero. If
adjustment is required, it will be necessary to zero adjust the meter under power off
conditions. Refer to figure 4.
Turn the zero-adjust screw on the bezel of the meter, using a small screwdriver, clockwise
or counterclockwise as necessary. Turn until the pointer exactly aligns with the zero of
the meter scale.
Range Switch and Power Measurement
The range switch should be placed at the highest power setting, (i.e., 50 Watts). This is
especially true when the amount of power being applied is unknown. After the RF power
is applied the range switch may be switched down so that a power indication is given
in the upper one-third of the scale.
Zero Adjust Screw
Figure 4
Zero Adjust
Operating Instructions
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