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7 – Operating Procedure
DPN 402197 © TSS (International) Ltd Page 9 of 30
4. The lateral offset (LAT) is measured from the centre of the coil array. Positive val-
ues indicate a target to starboard of the centre line. The field will contain question
marks if the target is out of range.
5. The vertical range to target (VRT) is the distance between the centre line of the
coil array and the target. There are several conditions that will cause the field to
contain question marks:
❐The target is out of range
❐The 350 System cannot compute an accurate position for the target
❐Coil saturation has occurred because the tone signal is too strong.
6. Coil altitude (ALT) information comes from an altimeter if the System includes one.
Otherwise, the information in this field will be the fixed coil height if available. The
field will contain question marks if there is no fixed height or altimeter information
available.
7. The SDC calculates the target depth of cover (COV) using COV = VRT – ALT. A
positive value indicates the target is covered. Zero or negative values indicate an
exposed target. There are several conditions that will cause the field to contain
question marks:
❐The target is out of range
❐The 350 System cannot compute an accurate position for the target
❐Coil saturation has occurred
❐There is no fixed coil height or information available to the SDC from an altimeter
8. The skew angle in the range -90 to +90 degrees. This field will contain question
marks if the System cannot measure skew angle. Zero skew is the ideal situation
where the ROV aligns on the same heading as the direction of the target. Skew is
positive when ROV heading is to starboard of the target direction.
9. The signal strengths, in microvolts, measured on channel 1 (starboard lateral –
SL), channel 2 (starboard vertical – SV), channel 3 (port lateral – PL), channel 4
(port vertical – PV), channel 5 (starboard fore-aft – SF) and channel 6 (port fore-
aft – PF).
Information included in the above signal strength fields may have a very large
dynamic range, extending from less than 1µV to more than 7 volts. To allow for
simple encoding of this range, the System displays and logs values using scien-
tific notation:
The signal value format is: abbc where the actual value is a.bb e+c µV
For example:
- Cable Survey System 1
- System Manual 1
- GLOSSARY 13
- AMENDMENTS 14
- 1 INTRODUCTION 16
- 1.1 SYSTEM DESCRIPTION 20
- 1.2 PRINCIPLE OF OPERATION 21
- 1.3 QUICK START FOR SDC USERS 22
- 1.4 WARRANTY 22
- 2 SYSTEM OVERVIEW 24
- 2.1 SCOPE OF DELIVERY 25
- 2.2 UNPACKING AND INSPECTION 27
- 2.3 SURFACE COMPONENTS 28
- Figure 2–3: SDC Display 29
- Figure 2–4: SDC PC Console 29
- 2.4 SUB-SEA COMPONENTS 32
- 2.4.1 Sub-sea Electronics Pod 32
- ❐ Power/comms 33
- ❐ Altimeter 33
- ❐ Aux Output 33
- ❐ Sensor 33
- 2.4.2 Sensing Coils 34
- 2.4.3 Altimeter 36
- ❐ Tracked ROVs or crawlers 37
- ❐ Trenching ploughs 37
- ❐ Towed sleds 37
- 3 PHYSICAL INSTALLATION 38
- 3.1 SDC INSTALLATION 39
- 3.2 SUB-SEA INSTALLATION 40
- 3.2.1 SEP 40
- 3.2.2 Sensing Coils 42
- 3.2.2.1 Assembling the Coils 43
- 3.2.2.2 Mounting the Coils 46
- 3.2.3 Altimeter Installation 48
- 3.3 INSTALLATION CHECK LIST 50
- 4 ELECTRICAL INSTALLATION 52
- 4.1 SUB-SEA COMPONENTS 53
- 4.1.1 Ground Connections 54
- 4.1.3 Sub-sea Electronics Pod 55
- 4.1.3.1 Power Requirement 56
- 4.1.4 Sensing Coils 58
- 4.1.5 Sub-sea Altimeter 59
- 4.1.5.2 Connection to the SDC 60
- 4.1.6 Roll/Pitch Sensor 61
- 4.2 SURFACE DISPLAY COMPUTER 62
- 4.2.1 Power Connection 62
- 4.2.4 Interface to Video 68
- 5 SYSTEM CONFIGURATION 70
- 5.1 SOFTWARE INSTALLATION 71
- 5.2 POWER-ON PROCEDURE 72
- 5.3.1 SEP type 74
- 5.3.2 Communication ports 75
- 5.4 PRINT CONFIGURATION 77
- 5 – System Configuration 78
- 6 OPERATION SOFTWARE 80
- ONFIGURATION 81
- 6 – Operation software 84
- 6.2.1.2 Run/ Display screen 87
- the centre line. Measure 89
- ❐ Communication status 90
- ❐ System time 90
- ❐ System errors 90
- 6.2.1.3 Forward Search Screen 91
- 6.2.1.4 Other Windows 93
- ❐Yellow indicates an event 95
- 6.2.1.5 Configuration Options 97
- 6.2.2 Survey Parameters 97
- 6.2.2.1 Altimeter 99
- 6.2.2.2 External Data Logging 101
- 6.2.2.3 Load Factory Defaults 102
- 6.2.2.4 Video Overlay Setup 102
- 350 Cable Survey System 105
- 6.3 AFTER THE DIVE 107
- 6.4 REPLAYING A LOG FILE 108
- 6.5 QUALITY CONTROL 110
- 7 OPERATING PROCEDURE 112
- 7.1 BEFORE THE SURVEY 113
- 7.1.2 Tone Frequency 114
- 7.1.3 Survey Requirements 114
- 7.2 DURING THE SURVEY 115
- 7.2.2 Data Logging 117
- 7.2.3 Replay Logged Data 118
- 7.3 DATA FORMATS 119
- 7.3.1 External Logging Format 119
- 7.3.1.2 Forward Search mode 121
- ❐The target is out of range 122
- 7.3.2 Internal Logging Format 123
- 7.3.3 Altimeter Data Format 125
- 7.3.3.3 Simrad UK90 127
- 7.4 AFTER THE SURVEY 130
- 7.5.1 Operating Performance 131
- 7.5.2 Sources of Error 132
- 7.5.2.1 ROV Handling 132
- Figure 7–3: ROV roll errors 134
- Figure 7–4: Sloping target 136
- ❐ Changes of ROV heading 137
- ❐ Acoustic noise 137
- Figure 7–5: Curved target 139
- 7.6 ROVS 140
- 7.6.1 Speed of Operation 140
- 7.6.3 Tracked ROV 140
- 8 SYSTEM SPECIFICATIONS 142
- 8.1 SPECIFICATIONS 143
- 8 – System Specifications 144
- 8.1.2 Sub-sea Electronics Pod 145
- 8.1.3 Search Coil Array 145
- 8.2 PERFORMANCE 146
- 8.3 SYSTEM TRIALS 147
- 8.3.2 Results 149
- 8.3.2.1 Accuracy 149
- 8.4 UPDATE RATE 150
- 9 MAINTENANCE 152
- 9.1 CIRCUIT DESCRIPTION 153
- 9.1.1 Sensing Coils 154
- 9.1.2 Sub-sea Electronics Pod 155
- 9.1.2.2 Processor Board 156
- 9.1.2.3 Power Supply 158
- 9.1.3 Current Loop 158
- Page 8 of 26 159
- 9.2.2 Sub-sea Electronics Pod 160
- ❐ A 2.5mm hexagonal key 161
- Processor Board 162
- ADC Board 163
- 9.2.3 Coil Cable Continuity 166
- 9.3 FAULT IDENTIFICATION 167
- 9 – Maintenance 168
- 9.3.2 Communications Failure 169
- Page 20 of 26 171
- 9.3.4 Altimeter Failure 173
- Page 24 of 26 175
- Page 26 of 26 177
- 10 SYSTEM DRAWINGS 178
- 10 – System Drawings 180
- A OPERATING THEORY 192
- A.1 ELECTROMAGNETIC FIELDS 193
- A.2 FIELD DETECTION 193
- A.3 SIGNAL ISOLATION 194
- A.4 CALCULATION 195
- A.4.1 Survey Mode 196
- A.4.2 Forward Search Mode 198
- A.4.3 Skew Measurement 199
- B OPTIONS 202
- B.1 DUALTRACK SYSTEM 203
- B.1.1 The Equipment 203
- B.1.2 The Differences 204
- B.1.3 Scope of Delivery 205
- B.1.4 Physical Installation 207
- B.1.4.1 Search-coils 207
- B.1.4.2 Sub-sea Pods 207
- B.1.5 Electrical Connection 208
- B.1.5.1 System Configuration 210
- B.1.5.2 System Operation 211
- B.2 TRAINING 212
- C CABLES AND TONES 214
- C.1 TONE INJECTION 215
- C.1.1 Frequency Selection 215
- C.1.2 Connection to the cable 215
- C.1.2.1 Short cables 215
- C.1.2.2 Long cables 216
- C.1.2.3 Fibre-optic Cables 216
- C.1.3 Seawater Return Path 217
- D ALTIMETER 218
- D.2 INSTALLATION 219
- D.2.1 Electrical Connection 219
- D.2.2 Serial Output 219
- D.2.3 Mounting 220
- D.2.4 Maintenance 221
- D.2.5 Test in Air 221
- D.2.6 Internal Settings 221
- D.3 THEORY OF OPERATION 222
- D.3.1 Operating Principles 222
- D.3.1.1 Speed of Sound 223
- D.3.1.2 Terminology 223
- D.3.1.3 Propagation Loss 224
- D.3.1.4 Limitations 224
- D.3.2 Technical Description 225
- D.3.2.1 Power Supply 225
- D.3.2.2 Transmitter 226
- D.3.2.3 Receiver 226
- D.3.2.4 Sensor Circuitry 227
- D.3.2.5 Digital Circuitry 227
- D.3.2.6 Averaging Algorithm 228
- D.3.2.7 Optional Modem 228
- D.4 PART NUMBERS 228
- D.5 DRAWINGS 229
- D – ALTIMETER 230
- E COIL TESTER 236
- E.1 PRE-OPERATION 238
- E.2 OPERATION 240
- E.2.1 Frequency Selection 242
- E.3 FAULT IDENTIFICATION 243
- E.4 BATTERY REPLACEMENT 243
- E.5 MAINTENANCE 244
- E.6 SPECIFICATION 244
- F REFERENCE 246
- F.1 SURVEY DETAILS 248
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