Nortech DU 100 User Manual

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: [phone] Int. Tel: [phone]
Fax: [phone] Int. Fax: [phone]
Email: [e-mail] URL: www.nortech .co.za

NORTECH
All rights reserved
Copyright
Document No. : 895UM0001-02

Date of issue : May 2001

©

2000

DU 100

USER MANUAL

Table of Contents

1. INTRODUCTION............................................................................................ 3

2. TECHNICAL SPECIFICATIONS……………………………………….

3. OPERATIONAL INSTRUCTIONS.....................................................……

3.1 Intelligent Power Control...........................................................................….. 4

3.2 Display Contrast/Viewing Angle…………………………………………….

3.3 Data Acquisition……………………………………………………………..

3.4 DiagnosticOperation...................................................................................…. 5

4. OPERATIONAL MODES............................................................................. 6

4.1 Loop (Loop).................................................................................................... 6

4.2 Frequency (Freq)............................................................................................. 7

4.3 Sensitivity (Sens)............................................................................................. 8

4.4 Status (Stat)..................................................................................................... 9

4.5 Time (Time).................................................................................................... 10

4.6 Crosstalk (Xtlk)............................................................................................... 11

4.7 Built In Self Test (Test)................................................................................. 13

5. THEORY OF APPLICATIONS................................................................... 14

5.1 Loop Frequency and Inductance Change........................................................ 14

5.2 Loop Frequency Drift....................................................................................... 15

5.3 Detection Sensitivity........................................................................................ 16

5.4 Detector Status................................................................................................ 16

5.5 Historical Fault Data........................................................................................ 17

5.6 Crosstalk Prevention....................................................................................... 18

6. APPENDIX A – TYPICAL VALUES……………………………………… 19

4

4
5

895UM0001_02 DU100 User Manual Page 2 of 19

. INTRODUCTION

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.

Current operational and historical data are transferred form the vehicle detector to the
DU100 by means of an optical link. Data transmission form the vehicle detector unit
occurs continuously so no service disruption is necessary. Received data is verified
for integrity by means of a cyclic redundancy check (CRC), processes, and then
displayed on a LCD screen.

The Nortech DU100 Diagnostic Unit is a hand held test instrument capable of

1.1 The DU100 can be used with the following inductive loop detectors;
PD130, PD139 (excluding I²C models), PD140, PD230, PD239 (excluding I²C models),
PD240, TD136, TD136 Enhanced, TD250, TD250L, TD250LS, TD252.

1.2 Related Documents

“Inductive Loop Vehicle Detection” Document No. MKT01.

1.3 This manual covers the following units;

895FT0001 – DU100 Diagnostic unit – English
895FT0002 – DU100 Diagnostic unit – German
895FT0003 – DU100 Diagnostic unit – French
895FT0004 – DU100 Diagnostic unit – Italian
895FT0005 – DU100 Diagnostic unit - Spanish

895UM0001_02 DU100 User Manual Page 3 of 19

2. DU100 TECHNICAL SPECIFICATIONS

Frequency Resolution 1Hz

Sensitivity Resolution 0.001 % ∆ L/L

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 4 X 1.5V AA dry cell

Battery Life > 10 hours continuous

Operating Temperature Range 0°C to + 50 ° C

Dimensions 200mm (h) x 100mm (w) x 40mm (d)

Weight 380gms including batteries

3. OPERATIONAL INSTRUCTIONS

3.1 Intelligent Power Control

The DU100 Diagnostic Unit may be powered-up by pressing either the SELECT or
ENTER key. The unit may be turned off by the simultaneous pressing of both keys.
Automatic power-down will occur after the unit has been left unused after two
minutes.

3.2 Display Contrast/Viewing Angle

The display contrast may be adjusted by holding down either key: SELECT for
lighter, ENTER for darker.

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3.3 Data Acquisition

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. When the optical wand is brought into close proximity of the
red “RUN LED” of the detector under test, the DU100 will emit audible beeps as it
acquires data. A single beep received indicates that sufficient data has been received
and the optical link may be broken at this stage to enable operator interrogation.
Alternatively, the optical link may be maintained in order to facilitate continuous data
transfer and updating.

Data is extracted form the vehicle detector under test by means of a unidirectional

3.4 Diagnostic Operation

After pressing any button and powering the diagnostic unit, information can be
acquired ( indicated by an audible beep ). The DU100 will display the type of the
vehicle detector under test ( e.g. PD130 ) and its software release version on the top
line of the two display screen. The lower line will consist of a cyclical menu. Each
time the SELECT key [¤] is pressed, the cursor will jump to the next menu option.
Menu options, once selected, are activated by means of the ENTER key[ ↵ ].

895UM0001_02 DU100 User Manual Page 5 of 19

4. OPERATIONAL MODES

Each operational mode corresponds to a menu option. These are discussed below.

4.1 Loop (Loop)

e.g.

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.

SELECT [¤] advance to the next detector channel ( multi-channel units only ).

ENTER [ ↵ ] returns control to main menu.

The inductance change (%∆L/L) is a measure of the magnitude of detection. Typical
passenger vehicles register a peak change of the order of 1% - 3% ∆ L/L. Poorly
designed loop installations can lead to this value being significantly reduced.

Below are typical inductance changes (%∆L/L) for a loop measuring 2m x 1m and
having 3 turns; with no wire mesh re-inforcing.

KHZ % ∆ L/L 1

20.231 1.371

Channel

VEHICLE TYPE

BICYCLE 0.04 %

MOTORBIKE 0.12 %

ARTICULATED TRUCK 0.38 %

FOUR WHEEL DRIVE 0.40 %

5 TON TIP TRUCK 0.45 %

MOTOR CAR > 1.00 %

FORKLIFT > 1.00 %

The inductance change parameter can also be utilised to determine whether the
inductance change registered by a particular vehicle ( e.g. high undercarriage of a
commercial vehicle ) is of sufficient magnitude to break through the sensitivity
threshold of the vehicle detector. The relevant sensitivity threshold value may be
obtained from the detector data sheet and is typically 0.02% ∆ L/L.

895UM0001_02 DU100 User Manual Page 6 of 19

∆ L/L