Comtech EF Data HPCST-5000 - Manual (Page 125)

High-Power TWTA Satellite Terminals TWT Amplifiers
Rev. 1 4–7
9. Summary Fault.
There is a fault within the amplifier. Status line goes low when the fault occurs.
10. Fan Lock.
The fan is locked. A fan lock signal is caused by fan failure or an object
interfering with fan rotation. Status line goes low when the fault occurs.
4.1.3.3 Analog
1. Helix Current.
The TWT helix current may be determined by monitoring this voltage. There is
2 mA of helix current for each volt measured.
2. High Voltage Monitor.
The high voltage applied to the TWT may be determined by monitoring this
voltage. The high voltage is divided down so that one volt output equals 1,000V.
3. TWT Temperature.
The TWT’s collector temperature may be determined by monitoring this voltage.