6-48
Do not use twisted quads or ordinary multi-pole cable, which also has somewhat twisted parts.
In a twisted quad the signals in one pair will cross-couple to the other pair, because they are so
close, and because one pair has no means of protecting itself from the other pair. In an ordinary
multi-pole cable, the noise-cancelling properties are random or unknown i.e. cross-coupling
between the individual wires is bound to occur.
EMI
Electromagnetic Interference (EMI) is everywhere. It is the unwanted signal component that
disrupts a system, creates unwanted noise in the audio channels, or causes the system to go
down at irregular intervals. If EMI is not counter-acted at installation time, it will be very costly
to troubleshoot and change the system later. Intermittent faults with an EMI background can be
impossible to find.
The Speed-log units has been designed and tested with EMI protection in mind, but defective
wiring may destroy that protection.
Termination of Signal Cables
To reduce the risk of
x
EMI induction
x
Excessive noise on audio channels
x
Short circuits
x
Intermittent faults
x
Entanglement
x
Mix-ups
and to ease re-dressing of cabling and re-connections after service
All signal cables must be connected carefully and by using described method depending
on type of connection block terminal.
1.
Where the connection block terminals are of press-type we recommend to use bare
wires
2.
Where the connection block terminals are of screw-type we recommend to press
end-caps on the bare wire ends as described below
Same principles can be used on power cables.
The free ends should be as short as possible. This tends to make connecting more difficult, but
greatly reduces the risk of EMI induction.
The end caps must be crimped with the proper tool to attain a proper connection. Never use
pliers or crimp-tools intended for anything else than end caps.
Содержание JLN-900
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Страница 17: ...2 1 JLN 900 Technical Description ...
Страница 23: ...2 7 sigbel ...
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Страница 31: ...3 1 JLN 900 Technical Specification ...
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Страница 39: ...4 1 JLN 900 Installation of Transducer and Bottom Parts ...
Страница 49: ...4 11 Overall dimensions of the final installation is shown in Fig 1 2 Fig 1 2 MSSBSV H Main dimensions ...
Страница 59: ...4 21 Transducer and Valve Cover mounted Sea Valve fully opened ...
Страница 63: ...4 25 Fig 1 3 Aligning Transducer Connecting Tube ...
Страница 66: ...4 28 Overall dimensions of the final installation is shown in below Fig 2 2 Fig 2 2 MSDBSV H Main dimensions ...
Страница 76: ...4 38 Mounting Sea Valve on Upper Flange DB ...
Страница 81: ...4 43 Gasket Seal 2 ...
Страница 83: ...4 45 Transducer and Valve Cover mounted Sea Valve fully opened ...
Страница 86: ...4 48 Tube Bracket in its final position with Transducer flush seated ...
Страница 88: ...4 50 Fig 2 5 Aligning Transducer Connecting Tube ...
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Страница 93: ...5 1 JLN 900 Installation of NJC 80 Sig Processor ...
Страница 101: ...6 1 JLN 900 NQA 4480 Sig Distributor Technical Manual Incl installation setting up and maintenance guidelines ...
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Страница 151: ...7 1 JLN 900 Display Technical Description ...
Страница 167: ...7 17 No Name Default setting Function SD 4 2 SD 4 3 SD 4 4 there are remote systems connected ...
Страница 179: ...8 1 JLN 900 Analog Display Technical Manual ...
Страница 183: ...8 5 2 1 Main Dimensions NWW 828 Analog Display ...
Страница 184: ...8 6 2 2 Dimmer Potentiometer connection Analog Display ...
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Страница 187: ...9 1 JLN 900 Menu System ...
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Страница 209: ...10 1 JLN 900 WATER TRACK Technical Manual including Menu system ...
Страница 233: ...11 1 JLN 900 IEC 61162 NMEA 0183 User Guide ...
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Страница 255: ...12 1 JLN 900 Harbour Acceptance Test ...
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Страница 267: ...13 1 JLN 900 Calibration and Sea Acceptance Test ...
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Страница 281: ...JLN 900 system drawings 14 1 ...
Страница 289: ...CFT 780 4 TRANSDUCER 40m 14 9 ...
Страница 290: ...NKF 980 Sea Valve 14 10 ...
Страница 291: ...NKF 980 Sea Valve 14 11 ...
Страница 292: ...NWW 82 MAIN DISPLAY 14 12 ...
Страница 293: ...DISPLAY 3 1 87 14 13 ...
Страница 294: ...NCM 1080 DIMMER UNIT 14 14 ...
Страница 295: ...15 1 JLN 900 Description labels and drawings ...
Страница 300: ...15 6 This page is intentionally blank ...
Страница 301: ...16 1 Annex JLN 900 Speed Log System Manual ...
Страница 302: ...16 2 Annex Table of contents ANNEX I EQUIPMENT RECYCLING 3 ANNEX II ENERGY SAVING 5 ...
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