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In-Pavement Loop Tester

Simple single connection easy to use in-pavement loop tester. This rugged field service instrument is purpose designed for in-pavement loop analysis. The basic LT-100 unit utilises a single loop feeder connection to initiate a measurement operation which displays on an alpha-numeric LCD panel all relevant in-pavement loop parameters including; open circuit, short circuit, DC resistance, inductance, loop 'Q' and tuned frequency.

Additionally an analogue bar graph display indicates a vehicle actuation incorporating the relevant 'electromagnetic' change associated with the vehicle detection.

loop-testerThe more advanced LTM1000 features include all LT100 functions, a probe which locates concealed loop windings, and a single button actuation for loop insulation integrity evaluation.

Features and Attributes


· Single connection – all measurements displayed simultaneously

· Identifies loop short circuit and open circuit loop states

· Identifies vehicle actuation with analogue bar graph display

· Measures:

o DC Resistance

o Loop inductance (microhenries)

o Calculates tuned frequency

o Calculates loop 'Q'

pdfUser Manual


· Multi-function device

· Weather proof touch sensitive function selection keypad

· Large LCD panel with user selectable backlight

· Incorporates all LT100 measurement features (as stated)

· Verifies loop wire insulation integrity

· Locates in-pavement loops from moving vehicle

· Locates concealed in-pavement loop winding boundaries

· Robust plastic protective shroud

pdfUser Manual

Common Features

· Single 9 volt DC battery operation

· Single momentary switch ON / OFF operation

· Auto timeout operation 15secs after removal loop /open circuit.

· Single connection to initiate loop measurements

· Manual LCD backlight operation for power consumption

· Measures immediately when loop feeders are connected


In-Pavement Symmetripole Loop Tester

In-Pavement-Symmetripole-Loop-TesterThis is a rugged field service instrument, purpose designed for in-pavement symmetripole loop analysis. Symmetripole loop configuration is achieved by connecting two quadripole loops in a manner to enable the fields to complement each other. This 'balanced' field operation, provides a measurable more consistent operation in varied environments than traditional type A square loops (Morris, Dean & Hulscher 1983).

The SLT-100 Symmetripole Loop Tester identifies correct electromagnetic field 'phasing' of in-pavement symmetripole loops. The transmitter unit has a standard automobile 'cigarette lighter' plug to facilitate 12 volt DC supply connection. The 'local' and 'remote' sensing units (interconnected with white spiral cable), require a single 9 volt DC battery installed in the unit without the LED display.

A bar graph representation utilising LEDS provides an excellent field indication of energy levels in individual loops and balanced field energy levels when verifying the phasing of the two loops.