Thruline RF Power Meter, Model 4421
43
Power Sensor (Cal Cart only)
1. Disconnect the RF line from the Cal Cart.
2. Remove the Cal Cart front panel (see
"Front Panel (Cal Cart only)" on page 42
).
3. Disconnect the sensor cable from the power sensor.
4. Disconnect the RF cable from the sensor output port.
5. Remove the screws on the sensor mounting bracket.
6. Remove the sensor from the mounting bracket.
7. Put the new sensor in the bracket and screw it into place.
Note: Make sure the arrow on the side of the sensor points towards the load, and that the end labeled “SOURCE”
points towards the front of the Cal Cart.
8. Connect the RF cable to the sensor end labeled “LOAD”. Connect the sensor cable.
9. Replace the Cal Cart front panel.
Load
1. Disconnect all RF cables from the RF connectors on the load.
2. Unplug the blower assembly on blower-equipped loads.
3. Replace the vent plugs with the shipping plugs.
4. Remove the mounting bolts connecting the load to the Cal Cart.
5. Remove the load.
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
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.
CAUTION
The Bird 4421 must be powered off when connecting or disconnecting the power
sensor from the power meter.
CAUTION
Changing the sensor’s connectors will invalidate calibration data, and may reduce the
maximum power rating of the unit.
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.
WARNING
Heavy load. Do not attempt to lift unaided.
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