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Table of Contents
Summary of Contents for Megger L1070
- Page 1 AVTM651070 Rev B Nov 2006 Instruction Manual L1070 and L1071 Portable Locator Catalog No. 651070 and 651071 Read this entire manual before operating. Valley Forge Corporate Center 2621 Van Buren Avenue Norristown, PA 19403-2329 U.S.A. 610-676-8500 www.megger.com...
- Page 2 L1070 and L1071 Portable Locator Instruction Manual...
- Page 3 Specifications are subject to change without notice. WARRANTY Products supplied by Megger are warranted against defects in material and workmanship for a period of one year following shipment. Our liability is specifically limited to replacing or repairing, at our option, defective equipment.
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Page 5: Table Of Contents
Table of Contents 1................................1 Introduction............................1 Receiving Instructions........................1 General Information ........................1 2................................3 Safety ..............................3 Precautions ............................ 3 3................................5 Specifications ............................. 5 Receiver............................5 Transmitter............................ 6 Battery Charger..........................7 4................................9 Transmitter Operation ........................9 Controls and Indicators (Fig. - Page 6 6................................31 Fault Locating with the L1070/L1071....................31 Introduction..........................31 Signal Return through an Insulated Fault..................31 Setting the Transmitter to Fault Mode..................32 Setting the Receiver to Fault Mode....................32 Ground Return Probe ........................32 Ground Return Probe Insertion ....................33 Ground Return Probe Fault Locating...................
- Page 7 List of Figures Figure 1: Transmitter Controls and Indicators..................9 Figure 2: Multiple Grounded Circuit Connection ................13 Figure 3: Multiple Ground Power Utility Application............... 14 Figure 4: Multiple Ground Telco Application................... 14 Figure 5: Flexible Coupler Connection..................... 15 Figure 6: Inductive Connection......................16 Figure 7: Inductive Connection 30°...
- Page 8 AVTM651070 Rev B Nov 2006...
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Page 9: Introduction
Receiving Instructions Check the equipment received against the packing list to ensure that all materials are present. Notify Megger of any shortage. Telephone 610-676-8500 and ask for the customer service department. Examine the instrument for damage received in transit. If damage is discovered, file a claim with the carrier at once. - Page 10 5. Eight 1.5 V D-size batteries (for L1070 non-rechargeable transmitter only) 6. Six 1.5 V C-size batteries 7. Ground rod 8. Ac battery charger (for L1071 rechargeable transmitter only) 9. Carrying case Options 1. Ground return probe 2. Carrying case for the ground return probe 3.
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Page 11: Safety
Safety Precautions The L1070 and L1071 Portable Locators and the recommended operating procedures have been designed with careful attention to safety; however, it is not possible to eliminate all hazards from electrical test equipment or to foresee every possible hazard that may occur. It is therefore essential that the user, in addition to following the safety rules in this manual, also carefully consider all safety a spects of the test before proceeding. - Page 12 As a routine safety procedure, however, some users require that rubber gloves be worn, not only when making connections to the high-voltage terminals but also when manipulating controls. Megger considers this an excellent safety practice. Warning and Caution Notices Warning and caution notices are used throughout this manual where applicable.
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Page 13: Specifications
Specifications Receiver Operating frequency: 82 kHz, 8 kHz, 815 Hz, 50/60 Hz (PASSIVE) Antenna mode: Null-responding vertical coil Peak-responding horizontal coil Audio indication: Variable pitch response on all frequencies. Current measurement Display indicated relative current simultaneously between any two selected cables for target cable verification in a multi-conductor environment. -
Page 14: Transmitter
Transmitter Operating frequency: 82 kHz, 8 kHz, 815 Hz and BOTH (815Hz/82kHz) AC LOAD RESISTANCE MEASUREMENT.LOW BAT Low battery warning modulated or output signal every 20 seconds. Automatic from 5 to 2000 Ω Load matching Output power: Normal High 815 Hz 0.6 W 2.0 W 8 kHz... -
Page 15: Battery Charger
SPECIFICATIONS Battery Charger Ac battery charger (included with L1071 Portable Locator) charges battery overnight Input: 120 V ac Output: 12 V dc @ 500 mA Output cord: 6 ft (1.82 m) with 2.5 mm x 5.5 mm female power connector Dc battery charger (available as an option with the L1071 Portable Locator) 1.0 ±10% A Charge rate:... - Page 16 AVTM651070 Rev B Nov 2006...
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Page 17: Transmitter Operation
Transmitter Operation Controls and Indicators (Fig. 1) Follow all safety precautions in Section 2 of this manual. OUTPUT OUTPUT OUTPUT CIRCUIT SIGNAL CIRCUIT BREAKER CONTROL IMPEDANCE RECHARGER SIGNAL TRANSMITTER BATTERIES NEED OUTPUT JACK OUTPUT ON INDICATOR REPLACEMENT FREQUENCY OR CHARGING JACK CONTROL Figure 1: Transmitter Controls and Indicators... -
Page 18: Ac Resistance Indications
POWER OUTPUT CONTROL The POWER OUTPUT selects Low or High power output from the power transmitter. LOADING Indicator The LOADING indicator flashes to indicate the output circuit impedance. When the indicator blinks 4 times per second, it is indicating a nearly short circuit. When the indicator blinks 1 time every 3 seconds, it is indicating a nearly open circuit. -
Page 19: Transmitter Rechargeable Battery Option
TRANSMITTER OPERATION Transmitter Rechargeable Battery Option If your transmitter has an optional rechargeable battery, the battery cover will extend past the main transmitter housing shell approximately 1/2 in. (1.27 cm). The recharger jack is situated near the carrying handle on the transmitter housing. -
Page 20: Selecting The Locating Method
Selecting the Locating Method Identify the application below that matches your job, and then select the locating method. Although the first method listed under each heading will produce results with the simplest connections, we recommend that you use direct connection whenever possible. -
Page 21: Power Utility Connection
TRANSMITTER OPERATION § Passive 50/60 Hz Locating FIBER-OPTIC CABLES § Multiple Grounded Telco Circuit § Inductive Connection § Telephone Direct Shield Connection § Passive 50/60 Hz Locating NOTE: The output will cycle when the LOW BAT indicator is activated to inform you that a LOW BAT condition is present. -
Page 22: Telco Circuit Connection
Figure 3: Multiple Ground Power Utility Application Telco Circuit Connection Figure 4: Multiple Ground Telco Application Connect the red test cord to an existing ground point. Place the ground rod approximately 10 ft (3 m) from this point, at an angle of 90° to the buried cable or pipe. -
Page 23: Flexible Coupler Connection
TRANSMITTER OPERATION Flexible Coupler Connection You do not have to interrupt service when you use the flexible coupler, but the operating range is somewhat reduced. Also, more of the tracing signal may leak to neighboring cables and pipes than in the direct connection method. Ensure that the cable under test is insulated and grounded at both ends. -
Page 24: Inductive Connection
Inductive Connection This method is convenient because it does not require interruption of service. No test leads are needed. When the cable or pipe has no insulation or nonconductive coating, the operating range will be very short. Place the transmitter on the ground as close as possible to the path of the cable or pipe. -
Page 25: Direct Connection
TRANSMITTER OPERATION Direct Connection WARNING The direct-connection locating method shown in Figure 8 requires service interruption, and therefore must only be performed by authorized service technicians. Figure 8: Direct Connection Direct connection is the most reliable method available. It is less subject to interference, and an additional ground rod is not needed. -
Page 26: Continuously Grounded Circuit
8 kHz takes the best of both high and low frequency. This mid range frequency is not very susceptible to bleed off or coupling, but it can jump impedance on the utility better than the 815 Hz. It is still best to use 815 Hz, but 8 kHz is one of the most common frequencies used to locate coaxial cable and telecom pairs. -
Page 27: Telephone Direct Shield Connection
TRANSMITTER OPERATION Telephone Direct Shield Connection We recommend this method for telephone service because there is usually a ground lug available for making connections, and damage to the cable is unlikely. This method provides reliability, and you do not have to interrupt service. However, all connections must be made by either an authorized telephone company employee or an authorized locator contractor. -
Page 28: Figure 11: Telephone Direct Pair Connection
Plug the red/black test cord into the TX OUTPUT. Set the FREQUENCY switch to AF. The LOADING indicator will start blinking when the transmitter is turned on. Proceed to locate with the receiver toward the central office. Turn to Receiver Operation section to begin locating the cable or pipe. Figure 11: Telephone Direct Pair Connection AVTM651070 Rev B Nov 2006... -
Page 29: Receiver Operation
Receiver Operation Controls and Indicators Figure 12 shows the controls and indicators on the receiver. BUBBLE LEVEL (for 45 degree depth) DISPLAYS ABSOLUTE SIGNAL STRENGTH, DEPTH AND FAULT FINDING MODE MODE FREQUENCY INDICATOR IINDICATOR RELATIVE SIGNAL STRENGTH INDICATES BATTERIES BAR GRAPH NEED TO BE REPLACED (single bar shows gain setting) SELECTS VOLUME... - Page 30 ON OFF Press the ON OFF button to turn the RECEIVER on (if currently off) or off (if cur rently on). Upon turning the unit on, it will load the settings from the previous usage. Upon turning the unit off, the settings will be saved within the unit to be recalled next time the unit is used.
- Page 31 NOR will appear in the display to indicate NORMAL. REFIND PEAKING MODE The L1070/L1071 has a hidden function. To activate PIN Peaking Mode hold the SHIFT key and press MODE key. “Pin” will appear at the top of the display. Repeat the process to switch back to NORMAL Peaking Mode.
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Page 32: Locating Cable Or Pipe
Locating Cable or Pipe Figure 13: Locating the Cable or Pipe Make sure that the transmitter is solidly connected to the cable or pipe and turned on. Move about 15 ft (4.6 m) away from the transmitter along the path. For the inductive search method, move about 25 ft (7.6 m). -
Page 33: Null Mode Locating
RECEIVER OPERATION 90° while over the cable, a sharp null will identify the cable direction, which will be aligned with the flat side of the receiver. Trace the path by observing the peak indications while walking away from the transmitter at a moderate pace. As you trace the path in a direction away from the transmitter, the Peak meter reading will slowly fade. -
Page 34: Absolute Signal Strength
1. A junction where the signal divides (lower) 2. A break in the cable or shield (lower) 3. A change in depth of the cable or pipe (higher or lower) 4. An insulated pipe fitting (lower) 5. A slack loop of cable (lower) If you can no longer trace the path, even with the gain set to maximum, connect the transmitter to the far end of the cable, and trace back to the point where you lost the signal. -
Page 35: Signal Strength Adjusted For Depth (Current Measurement)
RECEIVER OPERATION Signal Strength Adjusted for Depth (Current Measurement) The receiver contains a feature that is very useful in identifying a target cable (the cable that is connected to the transmitter) in a field of various conductors and/or utilities. It is not unusual for the target cable to induce or to leak the transmitted signal into nearby conductors through a common ground system. -
Page 36: Gain Change Indication
Gain Change Indication Use the GAIN up and down buttons to increase and decrease the gain in small steps to center the meter reading to mid-scale. Passive 50/60 Hz Locating The receiver is capable of locating loaded underground primary and secondary utility cables. -
Page 37: Depth Measurement 45° Angle Method
RECEIVER OPERATION NOTE: If the display reads “Err” during a depth measurement, the receiver has detected a condition that could produce inaccurate readings. Be especially alert to errors that are caused by inadequate signal current flow. Check the transmitter hookup and far end ground return access point for loose connections. -
Page 38: Offset Magnetic Field Identification
Offset Magnetic Field Identification When adjacent cables or pipes are present in the right of way, they will sometimes create locating errors. Some of the transmitted signal is picked up by nearby conductors or pipes and reradiated so that it adds to or subtracts from the original signal. -
Page 39: Fault Locating With The L1070/L1071
Fault Locating with the L1070/L1071 Introduction Fault locating determines the position of an insulated break on an underground conductor. In the case of an insulation fault, some of the signal will return to the TRANSMITTER attached to the GROUND ROD through a break in the insulation. -
Page 40: Setting The Transmitter To Fault Mode
Setting the Transmitter to Fault Mode After the path is determined and the far access point is disconnected and isolated, the transmitter must be set to fault mode. This is accomplished by pressing the FREQUENCY button toggling through the frequencies until all LED indicators light up and flash. -
Page 41: Ground Return Probe Insertion
FAULT LOCATING Ground Return Probe Insertion Circuitry between the ground spikes provides a path for current in the soil returning to the GROUND ROD. The current enters one spike of the GROUND RETURN PROBE and exits the other spike. The GRP should be inserted into the soil with consistent force and depth. -
Page 42: Figure 20: Ground Return Probe Fault Locating
The bars may not always flash at the center of the graph. In this case the NOTE faults location is determined by the immediate change in fault direction when the G is move slightly in either direction. ROUND ETURN ROBE As you walk the path using the GRP, drop the probe every three or four steps. -
Page 43: Service
Service Maintenance The portable locator is a rugged, durable instrument built to withstand the rigors of day-to-day field use. It requires no periodic adjustments or calibration. It is however an electronic instrument and should be treated as such. § When not in use, keep the portable locator in its carrying case and store in a safe, dry place, away from extremes in weather conditions. -
Page 44: Avtm651070 Rev B Nov
AVTM651070 Rev B Nov 2006...
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