Operations Manual: HPAC-100/125/150/200/250-RM SSPA
4-3
4 Theory of Operation
Figure 4-4: Fault monitor points for the 2 RF module unit.
Figure 4-5: Fault monitor points for the 3 RF module.
Each amplifier module contains circuitry to monitor the operating current of the
internal FETs as well as the unit temperature. If the currents drop below threshold
limits or the module temperature exceeds a threshold limit, a fault signal is transmit-
ted. In addition, the input voltage of each module is monitored to ensure that it stays
within specified operating conditions. The user controlled faults for low and high RF
power depend upon the voltage of a calibrated detector diode. This voltage is com-
pared via the processor with the user set thresholds to determine fault conditions.
The user specified temperature fault is calculated by comparing the maximum tem-
perature of all of the temperature monitors within the rack enclosure to the thresh-
old. Finally, for the reflected power fault option, an additional detector diode is
installed to measure the amount of power reflected back into the output of the unit.
This voltage again is compared to the user set threshold via the processor.
Power Supplies
RFU1
Current Flt
Temp. Flt
Temp.
RFU2
Current Flt
Temp. Flt
Temp.
Voltage
Voltage
Ambient Temp.
Processor Flt.
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