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ETC_PUGM_LTM2K_v1.0

PRODUCT

USER

GUIDE

LTM-2000

IN-PAVEMENT LOOP TEST METER

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Содержание LTM-2000

Страница 1: ...ETC_PUGM_LTM2K_v1 0 PRODUCT USER GUIDE LTM 2000 IN PAVEMENT LOOP TEST METER ...

Страница 2: ...tion 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 accord...

Страница 3: ...ollowing 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 BLAC...

Страница 4: ...t Up 5 6 1 5 Critical Battery Shut Down Before Start Up 6 6 1 6 Toggle Backlight 6 6 1 7 Backlight Time out 6 6 2 CHARGING 6 6 2 1 Battery Indicator 6 6 2 2 USB Charging 7 6 2 3 Battery LED Indicator 7 6 3 Q METER 7 6 3 1 Instructions for Calibrating Lead Resistance 9 6 3 2 Instructions for Measuring Loop Characteristics 10 6 3 3 Status Definitions 11 6 4 INSULATION TEST 12 6 4 1 Instructions for ...

Страница 5: ...d 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...

Страница 6: ...e 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 C...

Страница 7: ...d 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 l...

Страница 8: ...vice 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 supp...

Страница 9: ...s 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 pa...

Страница 10: ...urface 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 ...

Страница 11: ...lue does not read 0 00 Ω when shorted the following procedure can be used to Zero the short circuit resistance Note Short circuit resistance calibration will be saved to memory even after a device shut down This procedure is not required every time the device is powered on or between separate loop tests Step 1 Turn on the device and navigate to the Q Meter Page Step 2 Connect the RED and BLACK tes...

Страница 12: ...p feeder cables have no polarity Step 3 The status will read LOOP and the following parameters will be listed R Resistance L Inductance F Tuned Frequency Q Q factor If the Status does not read LOOP refer to 6 3 3 for other status definitions Step 4 The line graph shows the Tuned Frequency over time of the loop Metal vehicles travelling over the loop will cause an increase in the loops Tuned Freque...

Страница 13: ...T CIRCUIT The resistive load between the RED and BLACK alligator leads is greater than 0 10 Ω and less than 0 10 Ω Yellow Yes Red No RE ZERO LEADS The resistive load between the RED and BLACK alligator leads is reading a negative reading below 0 10 Ω implying a bad calibration The lead resistance needs to be recalibrated Yellow Yes Red No NO OSCILLATION Q Meter has detected a resistive load betwee...

Страница 14: ...be displayed on the LCD prior to the test completion 6 4 1 INSTRUCTIONS FOR EVALUATING WINDING TO EARTH INSULATION INTEGRITY Step 1 Disconnect the loop and feeder from all other energised de energised equipment or conductive material in the cabinet The high voltage associated with this test may cause significant damage the sensitive electronic circuitry in the cabinet if not fully disconnected Ste...

Страница 15: ...TM 2000 cannot detect It is the responsibility of the technician to ensure that Both ends of the loop and feeder cables are completely disconnected from any sensitive equipment The RED and BLACK test leads are not connected to any live circuits or sensitive equipment The technician is not touching any conductive materials in contact with the RED or BLACK Terminals Step 6 Press and hold the insulat...

Страница 16: ...tance is calculated using a high impedance divider circuit and considers the variable input Test Voltage The purpose of this test is to provide the technician with a PASS or FAIL insulation integrity status for the loop and feeder cables Various road authorities have stated variations in acceptable winding to earth insulation resistance thresholds Laboratory testing indicates that mutual capacitan...

Страница 17: ...etection system as no magnetic field will be generated 6 5 1 LOCATE IN PAVEMENT LOOPS BY WALKING ON ROAD SURFACE CAUTION This method of loop finding requires the operator to walk out on the road surface in the general area that a loop is located The operator will be distracted by the LTM 2000 display and may lose awareness of approaching vehicles This test is only to be carried out if the operator...

Страница 18: ... frequency detected will also be displayed in kHz To get an accurate reading of the resonant frequency place the probe on the road surface as close to the loop as possible and where the magnetic field is strongest NOTE The resonant frequency of the loop detected using the loop finder may differ from the resonant frequency found using the Q Meter on the same loop due to changes in oscillating circu...

Страница 19: ...wed by a small dip when directly passing over the loop winding The Step Graph will remain high while walking from one side of the loop to the other A similar dip will be present while exiting the loop Once the edges of a loop are detected with the dips the operator can slowly sweep the probe over the dip location to determine a more precise location of the loop windings The layout of the loop can ...

Страница 20: ...he loop is detected The Loop Finder probe can be used to quickly locate loops on a stretch of road using a vehicle travelling up to 110 km hr The probe should be suspended from the vehicle such that the probe is 40 cm from the road surface and has direct line of sight down The probe can be hung out the door and the door carefully closed on the cable avoiding pinch points that may damage the cable ...

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