SECTION 4:
OPERATING INSTRUCTIONS
4-16
PORT LF
0008595_REV_E
4.3
Acoustic Air Testing
This section describes the acoustic air testing to ensure proper function of the Unit before deployment.
4.3.1
Setup
The specific acoustic impedance of air is quite different from that of seawater, which renders the
Transducer a far less efficient receiver when out of water. For this reason, it is necessary to place the
source (deck Unit Transducer or speaker) within a meter or two of the PORT-LF Transducer, with no
obstructions to the acoustic path. Depending on the environment, some experimentation may be
necessary to find a suitable location.
4.3.2
Tests
The proper six digit commands unique to the Unit undergoing testing are required for the tests that follow.
If it appears that commands are not getting through, verify that the serial number of the Unit being tested
matches that on the sheet of command codes.
1.
Using the Deck Unit, ascertain whether the PORT-LF is enabled or disabled by interrogating.
a.
If the Unit has just been turned on it will be enabled.
b.
Unless otherwise specified, the PORT-LF will be shipped from EdgeTech, with the
interrogate frequency tuned to 11 kHz and the reply frequency set to 12 kHz.
2.
Using the Deck Unit, send the ENABLE command. The instrument should reply with a series of
pings based on the orientation (tilt) of the PORT-LF.
3.
Next, send the RELEASE command.
a.
The shaft should rotate through seven rotations and send 1 ping for each complete
rotation. During a successful release cycle the system will transmit 7 pings.
b.
The system does not send status for the RELEASE command. If the shaft fails to turn 7
times or the cycle is somehow interrupted then the system will send the standard status
message.
4.
Interrogate the instrument using the Deck Unit, set at the appropriate interrogate frequency, and
tuned to the proper reply frequency.
a.
It is unlikely that the Deck Unit will display a valid range because of the proximity of the
two Transducers, but you should be able to verify that the instrument transmits a reply
pulse by listening to the alarm on the front panel of the deck Unit.
5.
Next, send the DISABLE command. The instrument should reply with the appropriate series of
pings to indicate tilt status.
Summary of Contents for PORT LF
Page 9: ...ix 6 Fax one invoice packing list and a copy of the airway bill to EdgeTech upon shipment...
Page 18: ......
Page 20: ......
Page 25: ...2 5 Figure 2 2 PORT LF Mechanical Standard 0010815...
Page 26: ...SECTION 2 SPECIFICATIONS 2 6 Figure 2 3 PORT LF DEEP Mechanical 0019564...
Page 46: ......
Page 48: ......
Page 65: ...6 17 Figure 6 24 PORT LF Callout Assembly Drawing Page 1 of 2 0008118...
Page 66: ...MAINTENANCE 6 18 Figure 6 25 PORT LF Callout Assembly Drawing Page 2 of 2 0008118...
Page 69: ......
Page 70: ...REMOTE RELEASE B 2 Appendix Figure B 1 Remote Release 0012120...
Page 71: ...B 3 Appendix Figure B 2 PORT LF Optional Remote Release 0012266...
Page 72: ...B 4 Appendix Figure B 3 PORT LF Optional Remote Release Callout 0007639...
Page 74: ...C 2 Appendix Figure C 1 Optional Tandem Kit Diagram 0017625...
Page 75: ...C 3 Appendix Figure C 2 PORT LF Optional Tandem Kit Callout Diagram 0008237...
Page 76: ......
Page 78: ...D 2 Appendix Figure D 1 PORT LF Optional Strongback Diagram 0017674...
Page 79: ...D 3 Appendix Figure D 2 PORT LF Optional Strongback Kit Callout Diagram 0008166...
