Xicom XTU-400K, Operation And Installation Manual

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MNC-0400-001 51 of 54 Revision G
Operation, Rack and Digital HPAs
3. The RF drive signal is within the frequency range of the amplifier
and +5 dBm or less with the HPA set for minimum gain (control fully
counterclockwise).
Caution
Operate the amplifier within the power limit
specification. Exceeding the input power limit will cause
a Helix Current Fault. Failure to comply may
permanently damage the TWT.
Vorsicht
Betreiben Sie den Verstärker im Rahmen der
vorgegebenen Spannungsbegrenzung. Eine
Überschreitung der Grenze für die Eingangsspannung
verursacht einen Helix-Strom Fehler. Nichtbefolgen
kann das TWT dauerhaft beschädigen.
Turn-On Sequence
1 Set the AC Power Switch ON.
2. Within two minutes after setting AC Power ON, press the ENABLE
and HV OFF keys on the front panel of the amplifier at the same
time. (This action assures that high voltage will be OFF when the
Filament Time Delay Cycle is over.)
3. Press and hold the [ Enable ] key while rotating the Gain Control to
minimum gain (fully counter-clockwise).
4. Connect a RF monitor to the output load assembly.
5. Connect a RF test generator or the operational RF drive to the RF
Input on the Rear Panel.
6. With gain set to minimum value, set the RF drive source for a
maximum output of +5 dBm.
7. Wait until the Filament Time Delay cycle is complete (approximately
three minutes). When the Filament Time Delay cycle is complete,
turn the RF drive off. The Standby indicator should light (green); the
Htr Standby indicator should light (Amber) and the FTD indicator
should go from amber to off.
8. Press the [ Enable ] key and the [ HV ON ] key at the same time. The
high voltage ON indicator should light (green). This indicates that
high voltage is ON and applied to the TWT.
Note
High voltage will not be enabled until the Filament Time Delay cycle is
complete and all faults are cleared.