Edgetech 3400 User manual

EdgeTech
4 Little Brook Road
West Wareham, MA 02576
Tel: [phone]
Fax: [phone]
www.EdgeTech.com
3400 PORTABLE SUB-BOTTOM SYSTEM
USER HARDWARE MANUAL
0021270_REV_D 3/23/2021

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3400 Portable Sub-bottom System 0021270_REV_C
The information, figures, and specifications in this manual are proprietary. They are issued in strict
confidence on condition that they not be copied, reprinted, or disclosed to a third party, either wholly or
in part, without the prior written consent of EdgeTech. Any reproduction of EdgeTech supplied software
or file sharing is strictly prohibited.
Copyright © 2020-2021 EdgeTech. All rights reserved.
Microsoft® and Windows® are registered trademarks of Microsoft Corporation.
Kevlar® is a registered trademark of the DuPont Company.
Intel® and Pentium® are registered trademarks of Intel Corporation.
Novagard G624® is a registered trademark of Novagard Solutions, Inc.
Storm Case™ is a registered trademark of Pelican.

iii
ATTENTION – READ THIS FIRST!
All personnel involved with the installation, operation, or maintenance of the equipment described in this
manual should read and understand the warnings and cautions provided below.
CAUTION!This equipment contains devices that are extremely sensitive
to static electricity. Therefore, extreme care should be taken when
handling them. Normal handling precautions involve the use of anti-static
protection materials and grounding straps for personnel.
WARNING!High Voltage may be present in all parts of the system. Severe
injury or death could occur if the equipment is mishandled. Therefore,
use caution when the electronics are removed from their containers for
servicing.
CAUTION!Operation with improper line voltage may cause serious
damage to the equipment. Always ensure the proper line voltage is used.
Warnings, Cautions, and Notes
Where applicable, warnings, cautions, and notes are provided in this manual as follows:
WARNING! Identifies a potential hazard that could cause injury or death.
CAUTION! Identifies a potential hazard that could damage equipment or
data.
NOTE: Recommendations or general information that is particular to the
material being presented.

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3400 Portable Sub-bottom System 0021270_REV_C
HARDWARE VARIATIONS AND COMPATIBILITY
The 3400 Portable Sub-bottom System contains both standard and proprietary hardware. At times,
EdgeTech may change the standard components due to their availability or performance improvements.
Although the component manufacturers and their models and styles may vary from unit to unit,
replacement parts will generally be interchangeable.
EdgeTech will make every effort to see that replacement components are interchangeable and use the
same software drivers (if applicable). At times, however, direct replacements may not exist. When this
happens, EdgeTech will provide the necessary drivers with the replacement part, if applicable.
EdgeTech may also change certain hardware per customer requirements. Therefore, portions of this
manual, such as parts lists and test features, are subject to change. These sections should be used for
reference only. When changes are made that affect system operation, they will be explicitly noted. Also,
some options and features may not be active in the customer's unit at the time of delivery. Upgrades will
be made available when these features are implemented.
Contact EDGETECH CUSTOMER SERVICE with any questions relating to compatibility.

v
ABOUT THIS DOCUMENT
We, the employees at EdgeTech, would like to thank you for purchasing 3400. At EdgeTech, our policy is
to provide high-quality, cost-effective products and support services that meet or exceed your
requirements. We also strive to deliver them on-time and to look for ways to improve them. We take
pride in the products we manufacture and want you to be entirely satisfied with your equipment.
Purpose of this Manual
The purpose of this manual is to provide the user with information on the setup and use of EdgeTech's
3400. Although this manual encompasses the latest operational features of the 3400, some features may
be periodically upgraded. Therefore, the information in this manual is subject to change and should be
used for reference only.
Liability
EdgeTech has made every effort to document the 3400 system wholly and accurately in this manual.
However, EdgeTech assumes no liability for errors or for any damages that result from the use of this
manual or the equipment it documents. EdgeTech reserves the right to upgrade features of this
equipment and to make changes to this manual without notice at any time.
Revision History
REVISION
DESCRIPTION
DATE
APPROVAL
A
Release to Production
1/23/2020
TS
B
Diagram Reformatting, Text Updates
4/20/2020
TS
C
Towfish and Pole Mount Updates
11/02/2020
JP
D
3400 OTS (Over-The-Side) Option Added
3/23/2021
AP

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3400 Portable Sub-bottom System 0021270_REV_C
WARRANTY STATEMENT
All equipment manufactured by EdgeTech is warranted against defective components and workmanship
for a period of one year after shipment. Warranty repair will be done by EdgeTech free of charge.
Shipping costs are to be borne by the customer. Malfunction due to improper use is not covered in the
warranty, and EdgeTech disclaims any liability for consequential damage resulting from defects in the
performance of the equipment. No product is warranted as being fit for a particular purpose, and there is
no warranty of merchantability. This warranty applies only if:
i. The items are used solely under the operating conditions and in the manner recommended in the
Seller's instruction manual, specifications, or other literature.
ii. The items have not been misused or abused in any manner, nor have repairs been attempted
thereon without EdgeTech Customer Service's approval.
iii. Written notice of the failure within the warranty period is forwarded to the Seller, and the
directions received for properly identifying items returned under warranty are followed.
iv. The return notice authorizes the Seller to examine and disassemble returned products to the
extent Seller deems necessary to ascertain the cause for failure.
The warranties expressed herein are exclusive. There are no other warranties, either expressed or implied,
beyond those set forth herein, and the Seller does not assume any other obligation or liability in
connection with the sale or use of said products. Any product or service repaired under this warranty shall
only be warranted for the remaining portion of the original warranty period.
Equipment not manufactured by EdgeTech is supported only to the extent of the original manufacturer's
warranties.

vii
SOFTWARE SERVICE OVERVIEW
EdgeTech provides software services free of charge. This software agreement does not address customer-
specified modifications or enhancements. These services may be ordered separately. Furthermore,
EdgeTech software upgrades are meant for the sole use of EdgeTech customers. Any reproduction of
EdgeTech-supplied software or file sharing is strictly prohibited.
Software Updates and Enhancements
EdgeTech customers can download new software releases with all modifications and enhancements from
the EDGETECH WEBSITE. Major software issues, should they occur, will be reported directly to the customer.
New software releases consist of the following:
•Software enhancements that are not on the price list
•Software fixes and changes
•Product integration
•Documentation updates to online help
•Tests for compatibility with other modules
Software patches consist of software that has undergone the following:
•Minor software enhancements
•Software fixes and changes
•Software Telephone, Facsimile, and E-mail Support
EdgeTech customers are entitled to contact EDGETECH CUSTOMER SERVICE to report a difficulty, discuss a
problem, or receive advice on the best way to perform a task. When contacted, EdgeTech Customer
Service will do the following:
•Respond within 24 hours by telephone, facsimile, or e-mail
•Immediately attend to serious problems affecting operations
•Attempt to find an immediate workaround

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3400 Portable Sub-bottom System 0021270_REV_C
RETURNED MATERIAL AUTHORIZATION
Prior to returning any equipment to EdgeTech, a Returned Material
Authorization (RMA) Number must be obtained from CUSTOMER SERVICE.
RMA Purpose
The RMA Number identifies returned equipment when it arrives at our receiving dock and enables tracking
while at our facility. Refer to the RMA number on all documentation and correspondences.
All returned materials must be shipped prepaid. Freight collect shipments will not be accepted. All
equipment should be adequately insured for shipping, but equipment belonging to EdgeTech must be
insured for full value.
If there is more than one item per consignment, include a packing with the shipment. An invoice can
double as a packing slip only when the contents are clearly numbered and identified on the invoice.
CAUTION!
Never attempt to ship a Portable Topside in its Storm CaseTM alone.
Although rugged, these cases are not intended to be used as shipping
containers, and the delicate internal components could be damaged.
Shipping in this manner will void any warranties.
NOTE: All shipping charges shall be the customer's responsibility, unless
under warranty, as EdgeTech will pay for return shipping.
NOTE: For International Shipments valued over $1000, the following
Shipper's oath must be sent with the invoice.
Shipper's Oath:
"I, ______________________________, declare that the articles herein specified are the growth,
produce, or manufacture of the United States; that they were exported from the
United States from the port of _____________________, on or about _______________; that they
are returned without having been advanced in value or improved in condition by any
process of manufacture or any other means; and that no drawback, or allowance has
been paid or admitted hereof."
Signed ______________________________

ix
CUSTOMER SERVICE
Customer service personnel at EdgeTech are always eager to hear from users of our products. Your
feedback is welcome and a valuable source of information that we use to improve these products.
Therefore, we encourage you to contact EdgeTech Customer Service to offer any suggestions or to request
technical support:
E-mail: servic[email protected]om
Mail: 4 Little Brook Road
West Wareham, MA 02576
Telephone: [phone]
Facsimile: [phone]
24-Hour Emergency
Technical Support Line: [phone]
NOTE: Please have your system Serial Number available when contacting
Customer Service.
For more information, please go to www.EdgeTech.com.

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3400 Portable Sub-bottom System 0021270_REV_C
COMPANY BACKGROUND
EdgeTech (formerly EG&G Marine Instruments) traces its history in Underwater Data Acquisition and
Processing back to 1966. EdgeTech has designed, developed, and manufactured products, instruments,
and systems — for the acquisition of underwater data, including marine, estuarine, and coastal
applications — for over 50 years.
EdgeTech responds to the Scientific, Naval, and Offshore communities' needs by providing industry-
leading equipment — such as Sub-Bottom Profilers, Side Scan Sonar, Acoustic Releases, USBL Positioning
Systems, and Bathymetric Systems — that have become standards in the industry.
EdgeTech consistently anticipates and responds to future needs with an active Research and Development
Program. Current efforts are focused on adopting new cutting-edge acoustic technology.

xi
TABLE OF CONTENTS
ATTENTION – READ THIS FIRST! .........................................................................................................iii
Warnings, Cautions, and Notes................................................................................................................ iii
HARDWARE VARIATIONS AND COMPATIBILITY..................................................................................iv
ABOUT THIS DOCUMENT....................................................................................................................v
Purpose of this Manual............................................................................................................................. v
Liability...................................................................................................................................................... v
Revision History ........................................................................................................................................ v
WARRANTY STATEMENT ...................................................................................................................vi
SOFTWARE SERVICE OVERVIEW........................................................................................................vii
Software Updates and Enhancements.................................................................................................... vii
RETURNED MATERIAL AUTHORIZATION ..........................................................................................viii
RMA Purpose ......................................................................................................................................... viii
CUSTOMER SERVICE..........................................................................................................................ix
COMPANY BACKGROUND ..................................................................................................................x
TABLE OF CONTENTS.........................................................................................................................xi
LIST OF FIGURES.............................................................................................................................. xvi
LIST OF TABLES ................................................................................................................................xx
1.0 OVERVIEW.............................................................................................................................1-1
1.1 Key Features of the 3400 Sub-Bottom Profiling System ...........................................................1-1
1.1.1 CHIRP Transmission ..............................................................................................................1-1
1.1.1.1 Advantages of Full Spectrum CHIRP Technology..........................................................1-2
1.1.2 Dual Wideband Transmitters................................................................................................1-4
1.1.3 Dual Frequency Transmission...............................................................................................1-4
1.1.4 Enhanced Sub-Bottom Multi-Channel PVDF Receiver..........................................................1-5
1.1.5 Reflection Coefficient Calculation ........................................................................................1-7
1.1.6 Sub-Bottom of “Pipeliner” Mode .........................................................................................1-7
1.1.7 Surface Echo Attenuation.....................................................................................................1-9
1.1.8 Pulse Library Tailored for Most Survey Applications............................................................1-9
1.1.9 Built-in Motion, Pitch, Roll, Heave, and Depth Sensors .......................................................1-9
1.2 3400 Applications ......................................................................................................................1-9

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3400 Portable Sub-bottom System 0021270_REV_C
1.3 Main System Components.........................................................................................................1-9
1.3.1 3400 Rack Mounted Topside in Case and Ruggedized Laptop ...........................................1-10
1.3.2 3400 Cable ..........................................................................................................................1-10
1.3.3 3400 Standard Towfish .......................................................................................................1-10
1.3.4 3400 Tow Vehicle Pole Mounting Kit..................................................................................1-11
1.3.5 3400 Options ......................................................................................................................1-12
1.3.5.1 3400 OTS (Over-The-Side) Vehicle Option .................................................................1-12
1.3.5.2 Amplifier Option .........................................................................................................1-13
2.0 SPECIFICATIONS...................................................................................................................2-14
2.1 3400 Vehicle Specifications .....................................................................................................2-14
2.1.1 3400 Sonar Specifications...................................................................................................2-14
2.1.1.1 3400 Towfish Standard 2-16 kHz Sonar Specifications...............................................2-14
2.1.1.2 3400 OTS 1-10 kHz Sonar Specifications ....................................................................2-14
2.1.2 3400 Vehicle Physical Specifications ..................................................................................2-14
2.1.2.1 3400 Standard Towfish...............................................................................................2-14
2.1.2.2 3400 OTS Specifications..............................................................................................2-15
2.2 3400 Topside Specifications ....................................................................................................2-15
2.2.1.1 3400 Topside Physical Specifications .........................................................................2-15
2.2.1.2 3400 Topside Electrical Specifications........................................................................2-16
2.2.1.3 EdgeTech Laptop Computer Specifications ................................................................2-16
2.2.1.4 Amplifier Option Physical Specifications ....................................................................2-17
2.2.1.5 Amplifier Option Electrical Specifications ..................................................................2-17
2.2.2 3400 Kevlar Tow Cable Specifications ................................................................................2-17
2.2.3 Mechanical Drawings..........................................................................................................2-19
2.2.3.1 3400 Standard Towfish ICD ........................................................................................2-19
2.2.3.2 3400 Standard Towfish with Pole Mounting Hardware .............................................2-20
2.2.3.3 3400 OTS Vehicle ICD .................................................................................................2-21
2.2.3.4 3400 Topside ICD........................................................................................................2-22
2.2.3.5 3400 Topside Case ICD ...............................................................................................2-23
2.2.3.6 3400 Pole Mount Plate ICD.........................................................................................2-24
2.2.3.7 3400 OTS Mounting Flange ICD..................................................................................2-25
3.0 3400 TECHNICAL DESCRIPTIONS ...........................................................................................3-26

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3.1 3400 Standard Towfish Technical Description ........................................................................3-26
3.1.1 3400 Standard System Connection Diagram ......................................................................3-27
3.1.2 3400 Standard Towfish Electronics Bottle and End Cap Diagrams.....................................3-28
3.1.3 3400 Standard Towfish Cable and Connector Diagrams ....................................................3-31
3.2 3400 Portable Topside Technical Description .........................................................................3-35
3.2.1 3400 Topside Controls, Indicators, and Connectors...........................................................3-35
3.3 3400 Amplifier Option Technical Description..........................................................................3-36
3.3.1 Amplifier Rack Mount.........................................................................................................3-38
3.3.2 Amplifier Connection Diagram ...........................................................................................3-40
3.3.3 Amplifier Cable Diagram.....................................................................................................3-41
3.4 3400 OTS (Over-The-Side) Technical Description....................................................................3-42
3.4.1 3400 OTS Option Connection Diagram...............................................................................3-43
3.4.2 3400 OTS Electronics Bottle................................................................................................3-44
3.4.3 3400 OTS Vehicle Cable and Connector Diagrams .............................................................3-47
4.0 SETUP AND ACTIVATION ......................................................................................................4-51
4.1 Standard 3400 Towfish Setup and Activation .........................................................................4-51
4.1.1 Unpacking and Inspection ..................................................................................................4-51
4.1.2 Power Requirements ..........................................................................................................4-52
4.1.2.1 Use of an Uninterruptable Power Supply...................................................................4-52
4.1.2.2 Changing to a Non-US Power Plug..............................................................................4-52
4.1.3 Navigation Interface ...........................................................................................................4-52
4.1.4 3400 Portable Topside Placement......................................................................................4-53
4.1.5 Connecting the System Components .................................................................................4-53
4.1.6 Connecting and Attaching the Tow Cable to the Tow Vehicle ...........................................4-54
4.1.7 3400 Portable Topside Connection and Activation ............................................................4-54
4.1.7.1 Connecting 3400 System Components.......................................................................4-55
4.1.7.2 Connecting 3400 Systems Components and Optional Amplifier. ..............................4-56
4.1.7.3 Making an Ethernet Connection.................................................................................4-56
4.1.7.4 Activating the System.................................................................................................4-57
4.1.8 Performing Sub Bottom Pre-Deployment Checks ..............................................................4-58
4.1.9 3400 Tow Vehicle Deployment...........................................................................................4-61
4.1.9.1 Obtaining the Best Sonar Imagery When Towing ......................................................4-63

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4.1.9.2 Conducting Sediment Classification Surveys When Towing.......................................4-63
4.1.9.3 AHRS Usage.................................................................................................................4-64
4.1.9.4 Towfish Layback Charts ..............................................................................................4-64
4.1.10 U-Hinge Tow Bridle.............................................................................................................4-66
4.1.10.1 U-Hinge Tow Bridle Adjustment .................................................................................4-66
4.1.10.2 U-Hinge Tow Bridle Removal Instructions:.................................................................4-67
4.1.11 Pole Mounting the 3400 Tow Vehicle ................................................................................4-72
4.1.12 Removing the Tow Bridle....................................................................................................4-72
4.1.13 Removing Weights..............................................................................................................4-72
4.1.14 Removing the Rear Elevator ...............................................................................................4-74
4.1.15 Pole Mount Installation Instructions ..................................................................................4-75
4.1.16 Utilizing the Forward and Aft Eye Bolts..............................................................................4-82
4.2 3400 OTS Setup and Activation ...............................................................................................4-83
4.2.1 3400 OTS Unpacking and Inspection ..................................................................................4-83
4.2.2 Installing Rubber U-Shaped Safety Trim.............................................................................4-84
4.2.3 Power Requirements ..........................................................................................................4-85
4.2.3.1 Use of an Uninterruptable Power Supply...................................................................4-85
4.2.3.2 Changing to a Non-US Power Plug..............................................................................4-86
4.2.4 Navigation Interface ...........................................................................................................4-86
4.2.5 3400 Portable Topside Placement......................................................................................4-86
4.2.6 Connecting the 3400 OTS System Components .................................................................4-87
4.2.6.1 Instructions on Running Tow Cable to Connector......................................................4-87
4.2.6.2 Instructions on Securing OTS Mount to Vessels Mounting Hardware .......................4-89
4.2.7 3400 OTS Portable Topside Connection and Activation.....................................................4-89
4.2.8 Performing Sub-Bottom Pre-Deployment Checks ..............................................................4-90
4.2.9 3400 OTS Vehicle Deployment ...........................................................................................4-90
4.2.9.1 Obtaining the Best Sonar Imagery..............................................................................4-90
4.2.9.2 Conducting Sediment Classification Surveys When Towing.......................................4-90
4.2.9.3 AHRS Usage.................................................................................................................4-91
5.0 MAINTENANCE ....................................................................................................................5-92
5.1 Portable Topside......................................................................................................................5-92
5.2 Cleaning the Tow Vehicle and Tow Cable After Use................................................................5-92

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5.2.1 Cleaning the 3400 OTS Vehicle After Use...........................................................................5-92
5.3 Inspecting and Cleaning the Underwater Connectors.............................................................5-93
5.4 Storage.....................................................................................................................................5-93
5.5 Altering the 3400 Towfish Configuration ................................................................................5-93
5.5.1 Adjusting or Removing the Rear Elevator...........................................................................5-94
5.5.2 Removing the Sonar Processor Bottle ................................................................................5-95
6.0 TROUBLESHOOTING.............................................................................................................6-98
6.1 Computer System Restoration ................................................................................................6-98
6.2 AHRS Calibration....................................................................................................................6-100
7.0 KITS ...................................................................................................................................7-101

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LIST OF FIGURES
Figure 1-1: 3400 Sub-Bottom Transducers ................................................................................................1-4
Figure 1-2: Discover 3400 High (Yellow) and Low (Blue) Sub-Bottom Displays.........................................1-4
Figure 1-3 3400 PVDF Receiver..................................................................................................................1-5
Figure 1-4: Traditional Hydrophone with Side-Lob Echoes .......................................................................1-5
Figure 1-5: 3400 PVDF Imagery Side Lobes with Reduced Echoes ............................................................1-6
Figure 1-6: Comparison of 3400 Vs. Traditional Line Arrays Over Same Survey Line................................1-6
Figure 1-7: Pipeliner Mode Diffraction ......................................................................................................1-8
Figure 1-8: Diffraction Hyperbolas in the Echo Data .................................................................................1-8
Figure 1-9: Deployed 3400 Rackmount System.......................................................................................1-10
Figure 1-10: Tow Cable ............................................................................................................................1-10
Figure 1-11: 3400 Towfish Forward View ................................................................................................1-11
Figure 1-12: 3400 Towfish Aft View.........................................................................................................1-11
Figure 1-13: 3400 Towfish Port View.......................................................................................................1-11
Figure 1-14: 3400 Towfish with Pole Mounting Flange Installed ............................................................1-12
Figure 1-15: Side View of 3400 OTS Vehicle Configuration Option .........................................................1-12
Figure 1-16: Forward View of 3400 OTS Vehicle Configuration Option ..................................................1-13
Figure 1-17: 3400 System with Amplifier in Cases...................................................................................1-13
Figure 1-18: Amplifier in Case..................................................................................................................1-13
Figure 2-1: 3400 Towfish ICD (Click Image To Open Attached PDF)........................................................2-19
Figure 2-2: 3400 Towfish With Pole Mounting Hardware ICD (Click Image To Open Attached PDF) .....2-20
Figure 2-3: 3400 OTS Vehicle ICD (Click Image to Open Attached PDF) ..................................................2-21
Figure 2-4: 3400 Topside ICD (Click Image To Open Attached PDF)........................................................2-22
Figure 2-5 3400 Topside Case ICD (Click Image To Open Attached PDF).................................................2-23
Figure 2-6: 3400 SBP Pole Mounting Plate ICD........................................................................................2-24
Figure 2-7: 3400 OTS Vehicle Mounting Flange.......................................................................................2-25
Figure 3-1: Bottom of Standard 3400 System..........................................................................................3-26
Figure 3-2: 3400 System Connection Diagram.........................................................................................3-27
Figure 3-3: 3400 Electronics Bottle ICD ...................................................................................................3-28
Figure 3-4: Sonar Processor Endcap Diagram..........................................................................................3-29

xvii
Figure 3-5: 3400 Electronics Bottle Pinouts.............................................................................................3-30
Figure 3-6: Sub Cable T Splice 3400 SBP Tow Cable to Bottle, Transformer, and Tow Cable..................3-31
Figure 3-7: 3400 SBP 50 Meter Tow Cable Page 1...................................................................................3-32
Figure 3-8: 3400 SBP 50 Meter Tow Cable Page 2...................................................................................3-33
Figure 3-9: Tow Cable to Tow Fish Pinouts (Wet End).............................................................................3-34
Figure 3-10: 3400 Topside Front Panel ....................................................................................................3-35
Figure 3-11: 3400 Topside Rear Panel .....................................................................................................3-36
Figure 3-12: Amplifier Front Panel...........................................................................................................3-36
Figure 3-13: Back Panel Amplifier and Connector Panel .........................................................................3-37
Figure 3-14: Amplifier Rack Mount ICD (Click Image To Open Attached PDF) ........................................3-38
Figure 3-15: Amplifier Back Panel Interface to 3400 ...............................................................................3-39
Figure 3-16: Amplifier Connection Diagram (3400 OTS Vehicle Variant Depicted- Connections Are The
Same Regardless of Variant) ....................................................................................................................3-40
Figure 3-17: Amplifier to 3400 Topside Interface Cable..........................................................................3-41
Figure 3-18: Bottom of 3400 OTS Vehicle................................................................................................3-42
Figure 3-19: 3400 OTS Option Connection Diagram................................................................................3-43
Figure 3-20: 3400 OTS Electronics Bottle (Same as standard 3400)........................................................3-44
Figure 3-21: 3400 OTS Electronics Bottle Endcap....................................................................................3-45
Figure 3-22: 3400 OTS Pinouts.................................................................................................................3-46
Figure 3-23: Sub Cable T Splice 3400 OTS Tow Cable to Bottle, Transformer, and Tow Cable ...............3-47
Figure 3-24: 3400 OTS 50 Meter Tow Cable Page 1................................................................................3-48
Figure 3-25: 3400 OTS 50 Meter Tow Cable Page 2................................................................................3-49
Figure 3-26: Tow Cable to Tow Fish Pinouts (Wet End)...........................................................................3-50
Figure 4-1: 3400 Topside Serial Port Navigation Connection ..................................................................4-53
Figure 4-2: 3400 System Connections......................................................................................................4-55
Figure 4-3: 3400 Network Configuration Diagram...................................................................................4-57
Figure 4-4: 3400 Topside Front Panel-LED Indicator Lights .....................................................................4-58
Figure 4-5: Discover 3400 Application Window.......................................................................................4-59
Figure 4-6: The Towfish Control Tab........................................................................................................4-59
Figure 4-7: Towfish Control Tab-Pulse and Transmit Level Called Out....................................................4-60
Figure 4-8: Discover Shortcut Toolbar- Range Text Field and Normalize Gain Button Called Out..........4-60

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3400 Portable Sub-bottom System 0021270_REV_C
Figure 4-9: Tap Test Results .....................................................................................................................4-60
Figure 4-10: 3400 Tow Cable Grip Bridle Shackle Attachment................................................................4-61
Figure 4-11: Towfish Deployment............................................................................................................4-62
Figure 4-12: Loosening Bridle Elbow........................................................................................................4-67
Figure 4-13: Bridle Stowed Against Vehicle.............................................................................................4-67
Figure 4-14: Nut and Bolt Location Looking Through Handhold Hole. ....................................................4-68
Figure 4-15: Bridle Arm Bolt Locations- 2 Bolts Port and Starboard Sides ..............................................4-69
Figure 4-16: Bridle Removal Tool Orientation .........................................................................................4-70
Figure 4-17: Bridle Removal: Split Ring Removal.....................................................................................4-71
Figure 4-18: Bridle Removal-Elbow Hardware Removal..........................................................................4-71
Figure 4-19: 3400 Towfish with Pole Mount Installed, Tow Arms, Weights, and Elevator Removed .....4-72
Figure 4-20: 3400 Pole Mount Instruction-Front Panel Removal With (12) Screws and Eye Bolt Called Out
.................................................................................................................................................................4-73
Figure 4-21: 3400 Pole Mount Instruction- Weight Removal-Location of Bolt Hardware Top of Vehicle ..4-
73
Figure 4-22: 3400 Pole Mount Instruction- Weight Removal-Location of Bolt Heads on Bottom of Vehicle
.................................................................................................................................................................4-74
Figure 4-23: 3400 Pole Mount Instruction-Elevator Hex Screw Positions...............................................4-75
Figure 4-24: Port and Starboard Set Screw Removal...............................................................................4-77
Figure 4-25: Forward Dorsal Pole Mount Cable Hole Position ................................................................4-77
Figure 4-26: Forward Dorsal Bolt Locking Washer and Molybdenum Disulfide Coating.........................4-78
Figure 4-27: Forward Dorsal Pole Mount Bolt Position ...........................................................................4-78
Figure 4-28: Port and Starboard Pole Mount Bolt Positions....................................................................4-79
Figure 4-29: Pole Mount Bolt Tightening.................................................................................................4-79
Figure 4-30: 3400 Sideview with Pole Mount Installed ...........................................................................4-80
Figure 4-31: Towfish Mounting Flange to Pole Mount Flange Bolt Assembly.........................................4-81
Figure 4-32: Pole Mounted 3400 System.................................................................................................4-82
Figure 4-33: Forward Eye Bolt..................................................................................................................4-83
Figure 4-34: Aft Eye Bolt ..........................................................................................................................4-83
Figure 4-35: 3400 OTS Rubber Trim Installation......................................................................................4-85
Figure 4-36: 3400 Topside Serial Port Navigation Connection ................................................................4-86

xix
Figure 4-37: OTS Mounting Flange, Cable Clip, and Sea Cable Connector ..............................................4-87
Figure 4-38: OTS Mounting Flange ..........................................................................................................4-88
Figure 4-39: OTS Sea Cable Connector and Clip ......................................................................................4-88
Figure 4-40: OTS Mounting Flange with Bolts Installed...........................................................................4-89
Figure 4-41: OTS Flange Bolt Assembly....................................................................................................4-89
Figure 5-1: OTS Mounting Flange Recessed Structure.............................................................................5-92
Figure 5-2: Elevator Hex Screw Positions.................................................................................................5-94
Figure 5-3: Electronics Bottle Cotter Pin Removal...................................................................................5-96
Figure 5-4: Electronic Bottle Latch and Rubber Strip Locations ..............................................................5-97
Figure 7-1: 3400 OTS Vehicle Spares Kit ................................................................................................7-102

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3400 Portable Sub-bottom System 0021270_REV_C
LIST OF TABLES
Table 2-1: 3400 Standard Sonar Specifications .......................................................................................2-14
Table 2-2: 3400 OTS Sonar Specifications................................................................................................2-14
Table 2-3: 3400 Standard Towfish Specifications ....................................................................................2-15
Table 2-4: 3400 OTS Vehicle Specifications .............................................................................................2-15
Table 2-5: 3400 Topside General Specifications......................................................................................2-16
Table 2-6 3400 Topside Specifications.....................................................................................................2-16
Table 2-7: Topside Computer Specifications ...........................................................................................2-17
Table 2-8: Amplifier Option Physical Specifications ................................................................................2-17
Table 2-9: Amplifier Option Electrical Specifications...............................................................................2-17
Table 2-10: 50-Meter Tow Cable Specification........................................................................................2-18
Table 3-1: 3400 Topside Front Panel Indicator Light and Switch Descriptions .......................................3-35
Table 3-2: 3400 Topside Back Panel Switches and Connections .............................................................3-36
Table 3-3: Amplifier Front Panel Controls and Indicator Lights...............................................................3-37
Table 3-4: Amplifier Connector Panel Connections.................................................................................3-37
Table 3-5: Back Panel Amplifier Connections ..........................................................................................3-37
Table 4-1: AC Power Cord Wiring ............................................................................................................4-52
Table 4-2: 3400 LED Indicator Light Type, Color and Status....................................................................4-58
Table 4-3: 3400 25-Meter with Lead Pack Installed Layback Chart.........................................................4-65
Table 4-4 3400 40-Meter with Lead Pack Installed Layback Chart..........................................................4-65
Table 4-5: 3400 50-Meter with Lead Pack Installed Layback Chart.........................................................4-66
Table 4-6: AC Power Cord Wiring ............................................................................................................4-86
Table 7-1: 3400 Towfish Kit....................................................................................................................7-101
Table 7-2: 3400 Topside Spares Kit........................................................................................................7-101
Table 7-3: 3400 SBP Pole Mount Kit ......................................................................................................7-101
Table 7-4: 3400 Pole-Mounting Kit ........................................................................................................7-102