AR 10009284, Operating And Service Manual

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Model 40T26G40A
10 Rev A
3.2.6 External Interlock Connector
The TWTA is provided with an external interlock capability via a 15-pin female D-sub connector, J2. To
enable the high-voltage power supply, it is necessary to provide continuity between J2 pins 3 and 4. If the
amplifier shuts down because the interlock was opened, it will be necessary to reset the system to return to
standby (see
System Shutdown Screen in section 3.4). There is an internal jumper between J2 pins 1 and 2;
a continuity check through these pins can be used to verify the presence of the amplifier in the
instrumentation system. Users may adopt this interlock feature to disable the RF output for either equipment
protection or as a backup for personnel protection.
CAUTION:
Do not rely on the external interlock for personnel protection. The intent
of the external interlock feature is to disable the RF output for equipment
protection. Use proper operating and safety procedures to insure that
power is removed for personnel safety.
3.2.7 External IEEE-488 Connector
The TWTA is provided with a standard IEEE-488 connector on the rear panel. When using a bench-top
cabinet, the mating connector should be a straight-entry cable type, not a side-entry cable type.
3.2.8 RF Connector
CAUTION:
Many small RF connectors appear to be similar. Pay special attention to
use only the proper mating connector for this unit.