Bird Electronic 4314B, Руководство по эксплуатации, Страница: 15 / 48

3
Chapter 2 Installation
Portability
The Model 4314B is a portable instrument; the housing is not designed
for fixed mounting. A strap is provided for
carrying purposes.
When transporting the Thruline Wattmeter, it is best to insert the
original dust plug, or a Plug-In Element with the arrow pointed down,
in the measuring socket, and secure it with the catch. This will shunt
the meter circuit and serve to protect it by dampening the pointer
action during handling or shipping. Also, set the wattmeter controls to
ON and CW modes. In this position, any unnecessary battery drain
will be avoided. Handle the Plug-In Elements with care at all times as
their calibration could be disturbed if they are dropped.
Connections
The Model 4314B Wattmeter is normally supplied with two Female N
type connectors which are of the Bird Quick-Change “QC” design. Other
“QC” connectors are available as listed in the Replacement Parts. See
“Replacement Parts” on page 33.
1.
Insert the Model 4314B Thruline Wattmeter in coaxial transmission
lines of 50 ohms nominal impedance. The signal source and load con-
nections can be made to either side of the wattmeter with no differ-
ence in effect. Use a coaxial transmission line fitted with suitable
matching RF connectors. If cables of other than 50 ohms impedance
are used, a mismatch will occur which could cause serious inaccura-
cies in the readings.
CAUTION
Do not drop the Thruline Wattmeter or its elements or subject them
to hard blows. The microammeter is shock mounted in the wattmeter
housing, but its delicate
mechanism may be damaged by severe impact.
WARNING
Exposure to RF power radiation and the possibility of RF shock or
burns exists with some operating conditions. Always be sure to
turn off the transmitter when connecting or disconnecting a
wattmeter.
Be sure the transmission line is terminated into a load or antenna.
When a Plug-In Element is removed from the RF line socket, the
line section center conductor is exposed. Do not put fingers or other
objects into the Plug-In Element socket while RF power is applied.