17
Chapter 3 Installation
When transporting the Bird 43, insert the original dust plug, or an
element with the arrow pointing upward, in the element socket and
secure with the catch. This will shunt the meter circuit and protect the
meter by dampening needle action during handling and shipping.
Also, secure spare elements in their sockets with the pivoting knob;
just insert the element and twist the knob one-quarter turn.
Connections
Insert the Bird 43 in coaxial transmission lines of 50 ohms nominal
impedance. The RF source can be connected to either side of the
wattmeter without affecting readings.
If non-50 ohm cables are used, a mismatch will occur causing
inaccuracies in readings. However, if a mismatch cannot be avoided,
refer to “Impedance Mismatch” on page 16 for instructions. It is
strongly advised that this condition be avoided.
CAUTION
Handle elements with care. Calibration could be disturbed if they
are dropped.
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.
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