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5.2 Overview of Operation
The amplifier can be turned on using the front panel controls.
When operated in this manner (LOCAL), the following sequence of
events occurs after the AC power is applied by the operator:
• POST (Power On Self Test) - Self tests are initiated. These take
• HTD (Heater Time Delay) - Three minutes are allowed for the
• If the amplifier is in the STBY state, the HV ON switch is
Two different fault conditions may occur during the turn-on
sequence:
• Fault (Non-Latched) - Beam-off malfunction state. The amplifier will
• Fault (Latched) - Beam-off malfunction state. The SDBY LED is
5-2
several seconds to complete.
cathode of the TWT to reach operating temperature. Following
completion of warm-up, the amplifier STBY LED is lit.
pressed to initiate the Beam On Sequence (BONS). During this
sequence the amplifier XMT LED blinks.
automatically recycle to the state which existed prior to the
fault.
OFF and the FLT LED is ON. The operator must intervene to
return the amplifier to its normal operating state. This is
accomplished by pressing the RESET switch (momentary
pushbutton switch). After successful reset, the standby (STBY)
LED stays ON.
O P E R A T I O N
Installation and Operation Manual
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