AR 10031732, Руководство по эксплуатации и обслуживанию

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Model 4000TP2G4
Rev A 21
3.5.6 Miscellaneous Screens
Info Screen MENU 2 S2 - (labeled INFO) selects a screen that displays the RF sample port calibration factors
at various frequencies across the band. In addition, this screen displays the model number, serial number and
firmware revision information, which may be required by a service representative when providing technical
assistance. The EXIT key returns the display to MENU 2.
Event Screen Menu 4 S2 - Labeled EVENT provides a display of events logged by the control system. These
events include AC power-up, heater warm-up, change from standby to operate, faults, and resets. The events
are stored in a first-in-first-out (FIFO) software buffer that has room for 100 events; as new events are logged,
the older ones are discarded.
System Shutdown Screen - In the event of a system shutdown due to a latched fault (i.e., a fault such as body
over-current or power low line that requires a reset), the MENU screen is replaced by a screen indicating the
nature of the fault. Softkey S4 (labeled OK) is implemented as a reset key; pressing S4 brings back the
MENU screens. Line 3 of MENU 1, which normally displays the operational state of the TWTA, is used as a
fault display line until the fault is cleared. When the fault clears the system will automatically resume the
standby state and high voltage on will be enabled once again.
Factory Service Screens - A number of screens intended for factory service and calibration are behind
passwords and are not accessible to the user.
System Malfunction Screens - A number of screens are reserved to display error messages. These messages
are not normally seen and indicate a malfunction of the TWTA. System malfunction messages include the
following:
•
Database corrupt
• Communication failure
•
Cannot restore
•
CU line voltage too low to operate. System shutdown
In the event that one of these appears, shut off the TWTA and contact an authorized service representative
before proceeding.
CAUTION:
Attempts to operate the TWTA despite control unit problems may result
in loss of the static RAM database and calibration information.
3.6 INITIAL TURN ON AND WARM-UP PROCEDURE
Before Applying Power
• Verify that the equipment line voltage is compatible with the TWTA.
NOTE: If the user does not have a 5VDC max TTL signal pulse connected to the pulse input BNC
connector, there will be no RF output.
•
Install the TWTA as discussed in Section 3.2. Provide an RF generator to the RF input Type N connector.
Set RF generator level below -50dBm and set desired frequency in specified range. Connect a load
suitable for 8000 watts peak operation to the output connector. The load VSWR should be less than 2.0:1.
A power meter and suitable attenuators may be connected to the RF sample port. (Refer to RF sample port
calibration factors on the rear of the unit or on the
Info
screen in MENU 2). These show the relationship