Excel Technology LTM-2000 Technisches Datenblatt

ETC_PUGM_LTM2K_v1.0

PRODUCT USER GUIDE

LTM-2000

IN-PAVEMENT LOOP TEST METER

LTM-2000 Disclaimer

ETC_PUGM_LTM2K_v1.0

1DISCLAIMER

Excel Technology Co Pty Ltd (ETC) reserves the right to make changes to the technology described in this

document without notice and advises its clients to obtain the latest version of the relevant information

prior to placing an order. Excel Technology Co Pty Ltd warrants its products to the specification detailed

herein in accordance with standard conditions of sale, client specification, and conditions imposed

through government legislation, and is not liable for functional performance, operational performance,

or any damage consequential or otherwise resulting from the use of the ETC product.

Testing and product control techniques are utilised to the extent that Excel Technology Co Pty Ltd deems

necessary to support the relevant specification and warranty. Excel Technology Co Pty Ltd acknowledges

the proprietary information provided by Third Party component suppliers however, Excel Technology Co

Pty Ltd assumes no responsibility for the use of any other circuit or device other than the circuitry

embodied on Excel Technology Co Pty Ltd numbered engineering drawings and on Excel Technology Co

Pty Ltd circuit cards as identified according to the requirements of the Circuit Layouts Act 1989

(Australia) and used in accordance with the relevant equipment instructions contained herein.

Excel Technology Co Pty Ltd grants the user/client rights to reproduce any of the documents contained

herein but not subject to conditions of ‘Non-Disclosure’, providing such reproduction is conducted with

no alteration to any material written, drawn, or otherwise reproduced and/or contained in this

document.

Excel Technology Co and the Excel Technology Co logo are trademarks of Excel Technology Co Pty Ltd.

LTM-2000 Warning

ETC_PUGM_LTM2K_v1.0 1

2WARNING

Extreme caution is required when handling this device. The insulation breakdown functionality is a

controlled Megger test in which 500 Vdc is applied to the RED and BLACK output terminals for a short

period of time (approximately 200 ms).

Ensure loop under test are disconnected from any voltage source and are de-energised before

connecting the leads of the Loop Test Meter.

Consult the User Manual before activating functions on the device with the following symbol:

There is a risk of electric shock while the Insulation Test is active. During this test, between 400 Vdc

and 600 Vdc is applied to the RED and BLACK loop terminals to measure the loop insulation

resistance in Megaohms.

•While test is active do not touch the RED or BLACK leads or any conductive surfaces

electrically connected to the RED or BLACK test leads

•Do not connect the RED or BLACK terminal leads to any sensitive electronic equipment

during the insulation test as it may damage the equipment.

3CONTACT EXCEL TECHNOLOGY CO

Email: enquiries@exceltech.com.au

Website: www.exceltech.com.au

Phone: +61 7 3279 4322

Address: 18 Staple Street

Seventeen Mile Rocks

Queensland, AUSTRALIA 4073

LTM-2000 Contact Excel Technology Co 
ETC_PUGM_LTM2K_v1.0 2 
4CONTENTS 
1DISCLAIMER.............................................................................................................................................. I 
2WARNING................................................................................................................................................ 1 
3CONTACT EXCEL TECHNOLOGY CO........................................................................................................... 1 
5LTM-2000 IN-PAVEMENT LOOP TESTER ................................................................................................... 3 
1 TERMINALS................................................................................................................................................ 4 
2 INCLUDED CABLES....................................................................................................................................... 4 
2.1 Red and Black Test Leads................................................................................................................... 4 
 ............................................................................................................................................................................ 4 
2.2 Excel Technology Co. Loop Finder Probe............................................................................................ 4 
6USAGE ..................................................................................................................................................... 5 
1 POWER..................................................................................................................................................... 5 
1.1 Turn On Device .................................................................................................................................. 5 
1.2 Turn Off Device .................................................................................................................................. 5 
1.3 Automatic Time-Out Shut-Down ....................................................................................................... 5 
1.4 Critical Battery Shut-Down after Start-Up......................................................................................... 5 
1.5 Critical Battery Shut-Down Before Start Up ...................................................................................... 6 
1.6 Toggle Backlight ................................................................................................................................ 6 
1.7 Backlight Time-out............................................................................................................................. 6 
2 CHARGING................................................................................................................................................. 6 
2.1 Battery Indicator................................................................................................................................ 6 
2.2 USB Charging..................................................................................................................................... 7 
2.3 Battery LED Indicator......................................................................................................................... 7 
3 QMETER ................................................................................................................................................ 7 
3.1 Instructions for Calibrating Lead Resistance ..................................................................................... 9 
3.2 Instructions for Measuring Loop Characteristics ............................................................................. 10 
3.3 Status Definitions............................................................................................................................. 11 
4 INSULATION TEST...................................................................................................................................... 12 
4.1 Instructions for Evaluating Winding to Earth Insulation Integrity................................................... 12 
5 LOOP FINDER........................................................................................................................................... 15 
5.1 Locate In-Pavement Loops By Walking on Road Surface................................................................. 15 
5.2 Locate Exact Position of Loop Windings .......................................................................................... 17 
5.3 Locate in-pavement loops from a moving vehicle ........................................................................... 18 
 
 
 

LTM-2000 LTM-2000 In-Pavement Loop Tester

ETC_PUGM_LTM2K_v1.0 3

5LTM-2000 IN-PAVEMENT LOOP TESTER

The Loop Test Meter 2000 (LTM-2000) is a second-generation, field service device suitable for in-

pavement loop analysis. The LTM-2000 has three main functionalities for testing in-pavement loops:

1. Q Meter

•Measure in-pavement loop resistance, inductance, device dependant resonance

frequency and loop Q factor

•Time graph showing frequency changes when vehicle passes over loop in the road

•Fast short circuit and open circuit detection

•In field manual lead resistance calibration.

2. 500V Insulation Test

•Loop and feeder cable to earth insulation resistance measuring up to 200 MΩ

•Automatic connection checking for short circuit and incorrect connections to loop.

3. Loop Finder

•Find energised in-pavement loops installed in the road using ETC Loop Finder Probe

•Locate winding position to ±5cm in the road surface

•Locate loop area by sweeping the area with the probe either walking or driving up to

110km/hr

•Audible beep when loop detected.

The LTM-2000 is entirely portable with 30 - 250 hours of battery life using a 2600 mAh rechargeable

Li-ion battery with 5 Vdc 1A Micro-USB charging.

The LTM-2000 features a transflective graphical LCD display with a toggled white backlight for use in

any light conditions.

LTM-2000 LTM-2000 In-Pavement Loop Tester

ETC_PUGM_LTM2K_v1.0 4

5.1 TERMINALS

The LTM-2000 has four input terminals.

1. BLACK banana terminal

•Q Meter: Connect to end of loop or feeder cable

•Insulation Test: Connect to earth

•Loop Finder: Not Required.

2. RED banana terminal

•Q Meter: Connect to end of loop or feeder cable

•Insulation Test: Connect to end of loop or feeder cable

•Loop Finder: Not Required.

3. RCA Loop Finder probe terminal

•Q Meter: Not Required

•Insulation Test: Not Required

•Loop Finder: Connect and dangle probe 0 mm –40 mm from surface.

4. Micro USB 5V charging port.

CAUTION

The LTM-2000 Q Meter and Insulation Test functions are used for testing de-energised in-pavement

inductive loops only.

All terminals have TVS ESD protection up to 30 kV and clamping voltage up to 14.5V. Do not connect

red and black alligator clips to live voltages >5 Vdc for prolonged periods as this may cause damage

to the device.

DISCONNECT THE LOOP UNDER TEST FROM THE VEHICLE DETECTOR SYSTEM BEFORE CONNECTING

ALLIGATOR LEADS.

5.2 INCLUDED CABLES

5.2.1 RED AND BLACK TEST LEADS

RED & BLACK Test Leads

Weight

40 g

Length

1200 mm

Wire connection

Alligator

LTM-2000 plug socket

Banana 4 mm

Lead Resistance

0.2Ω–0.6Ω

Withstanding 500V

< 1 minute

5.2.2 EXCEL TECHNOLOGY CO.LOOP FINDER PROBE

Excel Technology Loop Finder Probe

Weight

320 g

Length

1500 mm

Inductance

1 mH

Plug type

RCA Phono

LTM-2000 Usage

ETC_PUGM_LTM2K_v1.0 5

6USAGE

6.1 POWER

6.1.1 TURN ON DEVICE

To power on the device, short press the RED Power Button.

•The following start-up logo will be displayed for a short period of time:

•The Loop Test Meter start menu will then be displayed with the following warning message:

Note: Holding the Power Button when the device is off will turn the device on for a short period of

time before turning it off again. This feature is to stop the device from accidentally turning on when

the on button is held on.

6.1.2 TURN OFF DEVICE

To turn off the device at any time, press and hold the power button for approximately two seconds.

•The screen will clear to blank,

•2 short beeps will sound,

•The RED STATUS light will illuminate until the device is completely turned off.

6.1.3 AUTOMATIC TIME-OUT SHUT-DOWN

If no buttons are pressed the device will automatically shut down after a set period of approximately

15 minutes.

•The screen will clear,

•2 short beeps will sound,

•The RED STATUS light will illuminate until the device is completely turned off.

6.1.4 CRITICAL BATTERY SHUT-DOWN AFTER START-UP

If the battery voltage of the device reaches a critically low voltage during operation, the device will

automatically turn off.

•The screen will display the following message:

•2 short beeps will sound,

•The RED BATTERY light will illuminate until the device is completely turned off.

LTM-2000 Usage

ETC_PUGM_LTM2K_v1.0 6

6.1.5 CRITICAL BATTERY SHUT-DOWN BEFORE START UP

The device will automatically shut down if the user attempts to turn on the device when the battery

voltage is at or below a critically low level.

•2 short beeps will sound,

•The RED BATTERY light will illuminate until the device is completely off.

Note: If the device does not respond at all to the power button being pressed, the battery may be too

low to activate this sequence and will need to be charged.

6.1.6 TOGGLE BACKLIGHT

The Backlight can be toggled by short pressing the RED Power button when the device is on for use in

low light conditions.

Note: Prolonged use of the backlight will significantly reduce battery life.

6.1.7 BACKLIGHT TIME-OUT

The Backlight will automatically turn off after approximately 5 minutes of inactivity to reduce power

consumption and increase battery life.

6.2 CHARGING

6.2.1 BATTERY INDICATOR

The LTM-2000 features a rechargeable 2600 mAh Li-Ion battery with a working supply voltage

between 3.6 Vdc at minimum discharge level to 4.2 Vdc at maximum charge level.

The battery voltage level is indicated by a battery charge icon in the top left of the display:

Full Battery

50% Battery

Low Battery

Note: The battery icon is a linear approximation of the battery’s remaining charge. Time taken to go

from 100% to 50% charge may not equal time taken to go from 50% to 0% charge.

LTM-2000 Usage

ETC_PUGM_LTM2K_v1.0 7

6.2.2 USB CHARGING

The LTM-2000 can be charged by simply connecting a standard USB power supply via a Micro USB

charging cable to the charging port located at the bottom of the device.

Maximum estimated charging time from absolute minimum discharge 0 mAh to full 2600 mAh is 5

hours.

The charging power can be supplied from any standard USB charger between 4.5 Vdc and 5.5 Vdc.

These include wall chargers, car chargers, computer USB 2.0 or USB 3.0 ports, etc.

Note: The LTM-2000 USB input has inbuilt overvoltage protection up to 20 Vdc, ESD protection ±30

kV, overcurrent limiter of 3A, reverse current limiter of 400 mA. The maximum charging current is 1A.

When the USB is connected to the device the following icon will be displayed instead of the battery

level icon:

USB Charger Connected (4.5 Vdc > USB supply voltage < 5.5 Vdc)

USB Overvoltage Detected (5.5 Vdc > USB supply voltage < 20 Vdc)

6.2.3 BATTERY LED INDICATOR

Colour

Meaning

GREEN

Battery fully charged

YELLOW

Battery charging

RED

Low battery

6.3 Q METER

The Q Meter functionality is used for measuring the following parameters of the vehicle detection in-

pavement loop:

Symbol

Parameter

Typical Range

Resistance

0.50 Ω- 3.00 Ω(0.1 ΩMin, 50 ΩMax)

Inductance

40 μH - 700 μH

Tuned Frequency

15 kHz - 140 kHz

Q-factor

> 6 (*Vehicle classification > 12)

The Q Meter function also features:

•Short Circuit detection (feeder to feeder resistance < 0.1 Ω)

•Open Circuit detection (feeder to feeder resistance > 50 Ω)

•Line graph displaying live vehicle detection monitoring for loop position verification

•Alligator lead resistance calibration.

LTM-2000 Usage

ETC_PUGM_LTM2K_v1.0 8

Loop Vehicle Detection Basics

The loops used for vehicle detection are continuous lengths of wire embedded into the roads

surface. The loop is connected via a feeder cable to the vehicle detector system in a nearby cabinet.

The vehicle detector system powers the loop with an oscillating AC signal which produces a magnetic

field in the loop area. The loop current will oscillate at a resonant frequency which is dependent on

the characteristics of the vehicle detector oscillating circuit as well as the inductance of the loop.

When a vehicle with a large metal surface area, parallel to the loop, passes over the loop area, the

resonant frequency increases as the inductance of the loop is decreased. The larger the surface area

and the closer the metal plane is to the loop, the greater the increase in resonant frequency.

The vehicle detection system will monitor the vacant loop frequency as the base frequency. A vehicle

is detected when the frequency spikes above this base frequency.

Q Factor Basics

The Q-Factor is a unitless parameter that indicates the ratio between the loop’s frequency

dependant impedance and the resistive copper losses of its windings. The ratio is given by the

equation:

  







Where:

= Quality factor

= Inductive reactance of the loop (Ohms)

= Resonate frequency (Hertz)

= Inductance of the loop (Henries)

= Loop copper resistance (Ohms)

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