artisan TRACKPOINT 3 4211A, Руководство по эксплуатации и обслуживанию

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TRACKPOINT 3 OPERATION
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measured by the hydrophone), and therefore, this speed of sound generally differs from that com-
puted by the operator from a reading of the hydrophone temperature. (The hydrophone tempera-
ture is used only to determine the target depression angle correction.)
Target Depth
The target depth parameter can either be manually entered, telemetered or input via analog-in
Depth BNC. Choose the method used to update the depth parameter.
The system is now tracking in the transponder mode, and you should observe the following:
• Target position displayed in the tracking window, represented by the target designated as the
transponder.
• The chosen target symbol shown in the status block with position data agreeing with the target
position on the grid.
• Range and bearing information being updated for that target in the status block.
• The Target #1 green Interrogate LED flashing for each interrogate signal transmitted, and the
red Receive LED flashing for each signal received.
• With a transponder at close range the Quality Factors should typically be 9’s or 10’s.
Hardwired Transponder Mode
The Hardwired Transponder mode feature is used where a burst or tone from the transmitter trig-
gers a transponder via an umbilical. A high level transmit burst from a transmitter can be attenu-
ated and impressed on an umbilical to trigger a hardwired transponder. This is useful in situations
where there are not enough conductors available to trigger with the normal responder key out
pulse or there is excess noise causing false triggers. When a target is set up as a Hardwired Trans-
ponder, the transmitter is enabled and the slant range is compensated for the one-way acoustic
travel time. Set the Target Interrogation Frequency to the correct value for the hardwired trans-
ponder’s receiver.
NOTE: The transponder lock-out time can be reduced in these circumstances to allow for a
faster interrogation rate than the normal 2 seconds.
3.4.2 RESPONDER MODE
To establish tracking in the responder mode, the proper cable connection must be made at the
Deck Unit. Connect the Trigger out signal from the SYNC connector of the Deck Unit to the Re-
sponder or Responder umbilical cable. To output a differential signal to the Responder connect the
TRIG-OUT1 (pin-M) and /TRIG-OUT1 (pin-L) lines to the Responder. To send a positive going pulse
connect the TRIG-OUT1 (pin-M) and COM (pin-N) signals to the Responder and to send a negative
going pulse connect the /TRIG-OUT1 and COM signals to the Responder. The TRIG-OUT signal lev-
els can either be +5 TTL or +12VDC, as selectable on the internal Peripheral Interface Card (PIC)
within the Deck Unit. Default setting is +5V or TTL compatible.