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NORTECH
All rights reserved
©
Copyright
2000
Document No. : 895UM0001-02
Date of issue : May 2001
Nortech International (Pty) Ltd
P O Box 4099
Willowton Hub
Pietermaritzburg
3200 South Africa
Tel: (033) 345 3456
Fax: (033) 394 6449
Email: mkt@nortech.co.za
DU 100
USER MANUAL
32A Wiganthorpe Road
Pietermaritzburg
3201 South Africa
Reg. No. 98/10951
Int. Tel: +27 33 345 3456
Int. Fax: +27 33 394 6449
URL: www.nortech .co.za
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Table of Contents
Related Manuals for Nortech DU 100
Summary of Contents for Nortech DU 100
- Page 1 Nortech International (Pty) Ltd P O Box 4099 32A Wiganthorpe Road Willowton Hub Pietermaritzburg Pietermaritzburg 3201 South Africa 3200 South Africa Reg. No. 98/10951 Tel: (033) 345 3456 Int. Tel: +27 33 345 3456 Fax: (033) 394 6449 Int. Fax: +27 33 394 6449 Email: mkt@nortech.co.za...
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Page 2: Table Of Contents
Table of Contents 1. INTRODUCTION.................... 2. TECHNICAL SPECIFICATIONS………………………………………. 3. OPERATIONAL INSTRUCTIONS.............…… 3.1 Intelligent Power Control................….. 3.2 Display Contrast/Viewing Angle……………………………………………. 3.3 Data Acquisition…………………………………………………………….. 3.4 DiagnosticOperation...................…. 4. OPERATIONAL MODES................4.1 Loop (Loop)....................4.2 Frequency (Freq)..................... 4.3 Sensitivity (Sens)..................... 4.4 Status (Stat)..................... 4.5 Time (Time)....................4.6 Crosstalk (Xtlk).................... -
Page 3: Introduction
. INTRODUCTION The Nortech DU100 Diagnostic Unit is a hand held test instrument capable of providing installation/service personnel with positive verification of the correct operation of a vehicle detector installation. It may only be utilised in conjunction with diagnostic compatible vehicle detector products from Nortech Industries. -
Page 4: Technical Specifications
DU100 TECHNICAL SPECIFICATIONS Frequency Resolution 0.001 % ∆ L/L Sensitivity Resolution Display Element 2 line x 16 Character LCD Display Contrast Adjustable via multi-function keyswitch Keyswitch 1 x Mode Selection, 1 x Power-on/execute Auto Power off 2 Minutes after last operation Optical Receiver Detachable wand with photo-diode Power Supply... -
Page 5: Data Acquisition
3.3 Data Acquisition Data is extracted form the vehicle detector under test by means of a unidirectional optical link. An optical wand ( normally located in the zippered side pocket of the DU100 bag) should be plugged into the jack socket at the top of the unit and the unit should be powered-up. -
Page 6: Operational Modes
4. OPERATIONAL MODES Each operational mode corresponds to a menu option. These are discussed below. 4.1 Loop (Loop) e.g. Channel % ∆ L/L 20.231 1.371 Frequency The loop frequency and change in inductance are displayed for the currently selected channel. The currently selected channel is displayed in the top right hand corner. This mode can be used to monitor the change in loop frequency and inductance as a vehicle traverses the loop. -
Page 7: Frequency (Freq)
4.2 Frequency ( Freq ) e.g. Drift 20.231 0.20% The loop frequency and frequency drift ( since last reset/retune ) are displayed for the currently selected channel. The currently selected channel is displayed in the top right hand corner. The drift measurement gives an indication of the quality of a loop installation. -
Page 8: Sensitivity (Sens)
4.3 Sensitivity ( Sens ) e.g. 0.110% 3.401% The minimum and maximum change in the loop inductance during vehicle detection are displayed for the currently selected channel. The currently selected channel is displayed in the top right hand corner. These values represent absolute minima and maxima and are valid since the last detector reset/retune. -
Page 9: Status (Stat)
4.4 Status ( Stat ) e.g. STATUS Chan : 1 ( undetect ) The loop status of the currently selected channel is displayed. The currently selected channel is displayed in the top right hand corner. Possible loop status conditions include: Undetect Detect iii. -
Page 10: Time (Time)
4.5 Time ( Time ) e.g. 10 D ( Reset ) Elapsed time ( in days and hours ) since the last reset/retune and the reason for the reset/retune are displayed. This information is particularly useful for detecting intermittent faults which are self- healing. -
Page 11: Crosstalk (Xtlk)
4.6 Crosstalk ( Xtlk ) First level screen awaiting first data capture. e.g. CROSSTALK Store . . . The channel to be stored can be changed by pressing the Select button if the detector is a multi-channel unit. The frequency of the channel indicated in the top right hand corner will be stored when the Enter button is pressed. - Page 12 The test uses the original stored frequency and compares it to the new successful samples. If the frequency is too close in proximity to the stored value, the test will fail. SELECT [ ] advances to the next detector channel ( multi-channel units only ) ENTER [ ↵...
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Page 13: Built In Self Test (Test)
4.7 Built In Self Test ( Test ) The function of the self test is to check the diagnostic unit’s functionality. The first test will test the display and buzzer, the screen will blink with all characters flashing and the buzzer being audible for this duration. The next test is to verify that the EPROM ( the device which contains all the diagnostic information ) is not damaged, the result being “PASS”... -
Page 14: Theory Of Applications
The relationship between absolute loop frequency and absolute loop inductance is exponential in nature and is dependent on the particular detector type. Curves which define this relationship are available on request from Nortech for a particular detector type. 895UM0001_02... -
Page 15: Loop Frequency Drift
5.2 Loop Frequency Drift This is a measure of the quality of loop installation. The display of drift value in Frequency mode represents the absolute difference between the current loop frequency and the reference loop frequency ( defined at the last reset/retune ). Abnormal values of loop frequency drift can indicate a loop installation of poor quality. -
Page 16: Detection Sensitivity
5.3 Detection Sensitivity Detection sensitivity may be defined as the threshold level at which the smallest change in inductance results in an output actuation. This is clearly dependent on the inductive loop characteristics and may be adjusted by the sensitivity switch setting on the detector itself. -
Page 17: Historical Fault Data
Thereafter the detector will change to the undetect ( Undetect ) state. During this time the detector will monitor the loop for vehicles, as well as determine the temperature changes around the loop and detector and adjust the levels accordingly. Upon a vehicle entering the loop and the threshold levels for detect being correct, the state then changes to detect ( Detect ). -
Page 18: Crosstalk Prevention
5.6 Crosstalk Prevention When two or more loop configurations are in close proximity, the fields of one loop can interfere and disturb the field of another. This phenomena, known as crosstalk, can cause false detects and cause the detector to lock-up and no longer function. The problem also exists when reinforcing used to strengthen a structure is in close proximity to the loop. -
Page 19: Appendix A - Typical Values
Appendix A – Typical Values Detector Frequency of Inductance Change Drift Sensitivity %∆L/L Model Operation %∆L/L before less retune than Typical 20KHz 150 KHz 0.02 %∆L/L 6 %∆L/L 0.02 to 0.5 %∆L/L 0.03 to 6 %∆L/L Parking 12KHz 85KHz 0.02 %∆L/L 6%∆L/L 0.02 to 0.5 %∆L/L 0.03 to 6%∆L/L...