Bird Technologies 4331 - Manual (Page 33)

Chapter 3
Installation
Portability
The Model 43 is a portable instrument, and the housing is not designed for
fixed mounting (see Outline Drawing, page 8). A strap is provided for carrying
purposes.
While transporting the Thruline Wattmeter, it is best to reinsert the original
dust plug, or a Plug-In Element with the “arrow” pointed upward, in the
measuring socket, and secure with the catch. This will shunt the meter circuit
and serve to protect the meter by dampening needle action during handling
or shipping. Also, secure spare Plug-In Elements in their receptacles with
the pivoting knob clamps; just insert the element to seat and twist the knob
one-quarter turn to hold. Handle the Plug-In Elements with care at all times.
Calibration could be disturbed if they are dropped.
Connections
WARNING
Leaking RF energy is a potential health hazard. Never attempt
to connect or disconnect equipment from the transmission line
while RF power is being applied. Severe burns, electrical shock,
or death can occur.
Insert the Model 43 Wattmeter in coaxial transmission lines of 50 ohms
nominal impedance. It is indifferent to which respective side the power source
and the load connections are made. If cables other than 50 ohm type are
used, a mismatch will occur causing inaccuracies in readings. However, if a
mismatch cannot be avoided, the results may be calculated per the Impedance
Mismatch paragraph. It is strongly advised that this condition be avoided.
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