Installation
8
115/230V AC Input Power
The internal power supply can operate at 115 VAC or 230 VAC. There is no user setting to select the input voltage
because the power supply automatically senses the input voltage. However, you must make sure that you have the
correct power cord plug and fuses installed for the line voltage you are using (refer to
"Replacing Fuses" on
page 37
).
AC Line Connectors
To make the AC line cord compatible with non-U.S. voltages, users must install the appropriate connector on the
power cord.
Batteries
The Bird 4421 RF Power Meter is completely portable and is powered from internal rechargeable nickel metal
hydride batteries.
The batteries are shipped in a low charge state. It is, therefore, recommended that you charge the instrument for
approximately 28 hours before using it for continuous operation.
Note: Battery charging at temperatures greater than 45° C (113° F) can result in reduced operational
time.
CAUTION
Long-term storage of this instrument can affect battery performance and reduce
battery life. Do not store the instrument for long periods of time without recharging
the batteries (refer to page 39). Failure to comply may result in reduced battery
charge and shortened battery life.
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