iv
Warning Statements
The following safety warnings appear in the text where there is danger to
operating and maintenance personnel and are repeated here for emphasis.
Refer to page 35, 38, 39, and 41.
Caution Statements
The following equipment cautions appear in the text whenever the equipment
is in danger of damage and are repeated here for emphasis.
Refer to page 2, 41, 43, 45, and 49.
WARNING
Never attempt to connect or disconnect RF equipment from the transmission line
while RF power is being applied. Leaking RF energy is a potential health hazard.
WARNING
To avoid personal injury, disconnect the power cord from the AC line before
performing any maintenance, including fuse replacement or changing the
line voltage setting.
WARNING
Use only Nickel Metal Hydride (NiMH) batteries that have a minimum
capacity of 4500 milliamper hours (mAh). Do not install batteries that are
not Nickel Metal Hydride. Do not install NiMH batteries that have less than
4500 mAh capacity. Failure to comply may result in damage to the batteries,
damage to the instrument, and injury to personnel from battery chemicals.
WARNING
Heavy load. Do not attempt to lift unaided.
CAUTION
Changing the sensor’s connectors will invalidate calibration data, and may
reduce the maximum power rating of the unit.
CAUTION
The Bird 4421 must be powered off when connecting or disconnecting the
power sensor from the power meter.
CAUTION
Do not use the power sensor with a load VSWR greater then 2:1. Damage to
the power meter, power sensor, or the RF power source could occur.
