Bird Technologies 8650B Series - Manual (Page 26)

Bird 8650 Series Moduload RF Load Resistor
14
Normal Shutdown
1. Turn RF power to the load off.
2. Wait five minutes, allowing the pump and fans to return coolant to ambient
room temperature.
3. Turn AC power off.
Note: Stopping the pump automatically opens the interlock connection.
Emergency Shutdown
With the use of interlock capability, the Load will automatically turn off the
transmitter’s RF power if an emergency arises.
Should an emergency arise that is not a fault of the unit, always turn off the
source of RF power first, and then the AC power to the load.
Performance Notes
The electrical performance of the Model 8655B/56B RF Loads is affected by
impurities or other chemical additives in the cooling liquid. Therefore, the
cooling liquid should be distilled water, or distilled water with industrially
pure ethylene glycol. Do not use any additives
Thermal performance is affected by impurities, particularly those which accu-
mulate in the form of scale on the surface of the ceramic tube and any other
water passages. This results in an increase of thermal resistance of the load,
and in turn, may cause the load to overheat and fail.
Used in conjunction with the appropriate Bird model wattmeter, such as the
Series 4600 and 4800 Thruline Wattmeter, the Model 8655B/56B may will be
capable of direct reading of RF power measurements within the equipment.s
rating.
CAUTION
Do not disconnect the line power first. Even a momentary application of RF
power to the load while the cooling circulation is off will cause almost
immediate destruction of the resistor element.