1 - AS 2703-1987 VEHICLE LOOP DETECTOR SENSORS
4 - PREFACE
5 - CONTENTS
6 - SECTION 1. SCOPE AND GENERAL
6 - 1.1 SCOPE.
6 - 1.2 REFERENCED DOCUMENTS.
6 - 1.3 DEFINITIONS.
6 - 1.3.1 Actuation
6 - 1.3.2 Counting rate
6 - 1.3.3 Detection zone
6 - 1.3.4 Feeder cable
6 - 1.3.5 Independent detector
6 - 1.3.6 Initial inductance
6 - 1.3.7 Interaction (crosstalk)
6 - 1.3.8 Limited presence detector
6 - 1. 3.9 Loop
6 - 1.3.10 Occupancy
6 - 1.3.11 Output
6 - 1.3.12 Paralysis time
6 - 1.3.13 Passage detector
6 - 1.3.14 Presence detector
6 - 1.3.15 Presence time
6 - 1.3.16 Q-factor
7 - 1.3.17 Rack-mounted detector
7 - 1.3.18 Recovery time
7 - 1.3.19 Response time (turn-on-time)
7 - 1.3.20 Sensitivity
7 - 1.3.21 Sensor unit (channel)
7 - 1.3.22 Turn-off time (for presence detectors and limited presence detectors)
7 - 1.3.23 Vehicle loop detector
7 - 1.3.24 White noise
8 - SECTION 2. MECHANICAL AND PHYSICAL REQUIREMENTS
8 - 2.1 CONSTRUCTION.
8 - 2.2 OVERALL DIMENSIONS.
8 - 2.2.1 Single-channel independent sensor units.
8 - 2.2.2 Multi-channel independent sensor units.
8 - 2.2.3 Rack-mounted sensor units.
8 - 2.3 MARKING.
8 - 2.4 PROVISION OF INFORMATION.
9 - SECTION 3. ELECTRICAL REQUIREMENTS
9 - 3.1 POWER SUPPLY.
9 - 3.1.1 Independent sensor units.
9 - 3.1.2 Rack-mounted sensor units.
9 - 3.2 PROTECTION.
9 - 3.3 ELECTROMAGNETIC RADIATION.
9 - 3.4 INDICATOR.
9 - 3.5 SWITCHES AND ADJUSTMENT FACILI-TIES.
9 - 3.5.1 General.
9 - 3.5.2 Sensitivity control.
9 - 3.6 CONNECTION FACILITIES FOR INDEPENDENT SENSOR UNITS.
9 - 3.6.1 Types of connection.
9 - 3.6.2 Single connector.
9 - 3.6.3 Separate LV and ELV connectors.
9 - 3.6.4 Provision of connecting leads.
9 - 3.7 CONNECTION FACILITIES FOR RACK-MOUNTED SENSOR UNITS
10 - 3.8 RELIABILITY.
11 - SECTION 4. OPERATIONAL PERFORMANCE
11 - 4.1 BASIS FOR SPECIFIED PERFORMANCE.
11 - 4.2 INDUCTANCE RANGE.
11 - 4.3 MINIMUMACTUATION.
11 - 4.4 MAXIMUM ACTUATION.
11 - 4.5 RESPONSE TIME.
11 - 4.6 TURN-OFF TIME.
11 - 4.7 RECOVERY TIME.
11 - 4.8 PRESENCE TIME.
11 - 4.9 PARALYSIS TIME.
11 - 4.10 PASSAGE DETECTOR OUTPUT.
11 - 4.11 OUTPUT CHARACTERISTICS.
11 - 4.11.1 Types of output.
11 - 4.11.2 Delay output.
11 - 4.11.3 Solid-state output.
12 - 4.12 AUTOMATIC DRIFT COMPENSATION (TRACKING)
12 - 4.13 INTERRUPTION OF ELECTRICITY SUPPLY
12 - 4.14 FAILURE MODE.
12 - 4.15 SURGE PROTECTION.
12 - 4.16 VARIATION IN OPERATING CONDITIONS.
12 - 4.17 SUSCEPTIBILITY TO INTERFERENCE.
12 - 4.18 INTERACTION (CROSSTALK).
12 - 4.19 LEAKAGE TO EARTH.
14 - APPENDIX A - PERFORMANCE CHARACTERISTICS OF VEHICLE LOOP DETECTORS
14 - A1 SCOPE.
14 - A2 RESPONSETIMES.
15 - A3 RECOVERY TIME.
15 - A4 PRESENCE TIME.
16 - A5 PARALYSIS TIME.
17 - APPENDIX B - SUGGESTED TYPE TESTS FOR CHECKING OPERATIONAL PERFORMANCE
17 - B1 SCOPE.
17 - B2 TEST APPARATUS.
17 - B2.1 Apparatus required.
17 - B2.2 Variable frequency oscillator.
17 - B2.3 Power supply.
18 - B2.4 Vehicle loop simulator.
18 - B2.5 Vehicle simulator.
18 - B2.6 Second vehicle simulator.
18 - B2.7 Interference source.
20 - B2.8 Counters.
20 - B2.9 Oscilloscope.
20 - B2.10 Environmental chamber.
21 - B3 CALIBRATION AND PRE-CONDITIONING.
21 - B4 TEST PROCEDURES AND CRITERIA.
21 - B4.1 Testing of multi-channel detector sensors.
21 - B4.2 Test for inductance range and normal operation.
21 - B4.3 Test for minimum and maximum actuation, response time and counting reliability.
21 - B4.4 Test for response time and turn-off time.
22 - B4.5 Test for presence time and/or paralysis times.
22 - B4.6 Test for supply failure and loop failure.
22 - B4.7 Test for automatic drift compensation (tracking).
22 - B4.8 Test for susceptibility to interference.
23 - B4.9 Test for interaction (crosstalk).
23 - B4.10 Test for leakage to earth.
23 - B4.11 Test for variation in operating conditions.
24 - APPENDIX C - RECOMMENDED ROUTINE TESTS FOR CHECKING OPERATIONAL PERFORMANCE
24 - C1 SCOPE.
24 - C2 SENSITIVITY TEST FOR PASSAGE DETECTORS.
24 - C3 SENSITIVITY TEST FOR PRESENCE DETECTORS.
24 - APPENDIX D - INFORMATION TO BE SUPPLIED WITH ENQUIRY OR ORDER