Thruline RF Power Meter, Model 4421
iii
Caution Statements
The following equipment cautions appear in the text whenever the equipment is in danger of damage and are
repeated here for emphasis.
See page 3, 43, 46, 48, and 52.
See page 6 and 43.
See page 6.
See page 8
See page 11 and 16.
See page 34 and 43.
See page 37.
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.
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.
CAUTION
During remote operation, periodically monitor the bus service request line. Failure to
detect a service request could result in equipment damage.
CAUTION
Due to the complexity of the Bird Power Sensor, field repairs beyond general
maintenance should not be attempted. Removal or disturbance of the power sensor
cover can result in cancellation of lifetime warranty.
CAUTION
Failure to install the properly rated fuse may result in equipment damage or nuisance
failures.
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