Megger L1070, L1071 Instruction Manual

AVTM651070

Rev B

Nov 2006

Instruction Manual

L1070 and L1071

Portable Locator

Catalog No. 651070 and 651071

Read this entire manual before operating.

M

Valley Forge Corporate Center
2621 Van Buren Avenue
Norristown, PA 19403-2329
U.S.A.

610-676-8500

www.megger.com

L1070 and L1071

Portable Locator

Instruction Manual

Copyright© 2006 by Megger. All rights reserved.

The information presented in this manual is believed to be adequate for the intended use of the product.
If the product or its individual instruments are used for purposes other than those specified herein,
confirmation of their validity and suitability must be obtained from Megger. Refer to the warranty
information below. 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. Equipment returned to the factory for repair must be shipped prepaid and insured.
Contact your MEGGER representative for instructions and a return authorization (RA) number. Please
indicate all pertinent information, including problem symptoms. Also specify the serial number and the
catalog number of the unit. This warranty does not include batteries, lamps or other expendable items,
where the original manufacturer’s warranty shall apply. We make no other warranty. The warranty is
void in the event of abuse (failure to follow recommended operating procedures) or failure by the
customer to perform specific maintenance as indicated in this manual.

M

Valley Forge Corporate Center
2621 Van Buren Ave
Norristown, PA 19403-2329

610-676-8500 (Telephone)
610-676-8610 (Fax)

www.megger.com

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. 1)..................................................................................................... 9

Ac Resistance Indications............................................................................................................. 10

Transmitter Rechargeable Battery Option.................................................................................... 11

Selecting the Locating Method..................................................................................................... 12

Power Utility Connection............................................................................................................. 13

Telco Circuit Connection............................................................................................................. 14

Flexible Coupler Connection........................................................................................................ 15

Inductive Connection................................................................................................................... 16

Direct Connection........................................................................................................................ 17

Notes on Selecting the Tracing Signal.......................................................................................... 17

Continuously Grounded Circuit................................................................................................... 18

Telephone Direct Shield Connection............................................................................................ 19

Telephone Direct Pair Connection............................................................................................... 19

5........................................................................................................................................................... 21

Receiver Operation.......................................................................................................................... 21

Controls and Indicators................................................................................................................ 21

Locating Cable or Pipe................................................................................................................. 24

Peak Mode Locating..................................................................................................................... 24

Null Mode Locating..................................................................................................................... 25

Absolute Signal Strength.............................................................................................................. 26

Signal Strength Adjusted for Depth (Current Measurement)........................................................ 27

Gain Change Indication............................................................................................................... 28

Passive 50/60 Hz Locating........................................................................................................... 28

Push-Button Digital Depth.......................................................................................................... 28

Depth Measurement 45° Angle Method....................................................................................... 29

Offset Magnetic Field Identification............................................................................................. 30

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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........................................................................................... 33

7........................................................................................................................................................... 35

Service.............................................................................................................................................. 35

Maintenance................................................................................................................................. 35

Repair........................................................................................................................................... 35

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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° Angle........................................................................................ 16

Figure 8: Direct Connection............................................................................................................. 17

Figure 9: Continuously Grounded Circuit......................................................................................... 18

Figure 10: Telephone Direct Shield Connection............................................................................... 19

Figure 11: Telephone Direct Pair Connection.................................................................................. 20

Figure 12: Receiver Controls and Indicators..................................................................................... 21

Figure 13: Locating the Cable or Pipe............................................................................................... 24

Figure 14: Determine Cable Path in Peak Mode............................................................................... 24

Figure 15: Depth Measurements 45° Angle Method......................................................................... 29

Figure 16: Signal Return through an Insulation Fault to Earth.......................................................... 31

Figure 17: Collapsible Ground Return Probe................................................................................... 32

Figure 18: Ground Return Probe Insertion....................................................................................... 33

Figure 19: Spoked Wheel Return Paths............................................................................................ 33

Figure 20: Ground Return Probe Fault Locating.............................................................................. 34

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AVTM651070 Rev B Nov 2006

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Introduction

Receiving Instructions

Check the equipment received against the packing list to ensure that all materials
are present. Notify Megger of any shortage. Telephone [phone] 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. Prepare a detailed description of the damage
and notify Megger.

This instrument has been thoroughly tested and inspected to meet rigid
specifications before being shipped. It is ready for use when set up as indicated
in this manual.

General Information

Thanks for purchasing the Megger L1070 or L1071 Portable Locator. The
portable locator will help you locate and trace the routes of buried power cables,
cable television cables, gas and water pipes, sewer lines, telephone cables, and
fiber-optic cables. When used with the accessory ground return probes, the
portable locator will pinpoint faults on most direct buried secondary cables and
some direct buried primary cables.

The transmitter transmits a special signal on the cable under test. The receiver
receives the signal and indicates how strong it is. Microprocessors in both units
process the information and allow you to determine the path of the underground
cable.

Supplied Components

1. Receiver unit

AVTM651070 Rev B Nov 2006

2. Transmitter unit

3. Red/black test cord

4. Instruction Manual AVTM651070

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Options

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

1. Ground return probe

2. Carrying case for the ground return probe

3. Flexible coupler

4. Dc battery charger (automotive)

Preparation for Use

Remove the receiver from the case. Locate the battery compartment. Install the
six 1.5-V C-size batteries as marked on the battery holder. Install the battery
cover and tighten the retaining screw.

Remove the transmitter from the case. Locate the battery compartment on the
bottom of the transmitter. Remove two screws from the battery compartment
door. Install the eight D-size batteries as marked on the battery holder. Install the
battery cover and tighten the two retaining screws.

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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 aspects of the test before proceeding. Safety is the responsibility of the
user.

F

Use suitable barriers, barricades, and warnings to keep people not actually
engaged in the test at a safe distance. Make sure that no one can make contact
with energized parts of the test equipment and the specimen under test.

Treat all terminals of power equipment as a potential electric shock hazard.
There is always the possibility of voltages being induced at these terminals
because of proximity to energized high-voltage lines or equipment.

Always turn the transmitter power off before touching any terminals.

Always disconnect test leads from the cable under test before attempting to
disconnect them from the portable locator.

Never connect the test leads to a cable that does not have a safety ground strap
in place. Never disconnect the test leads from a cable that does not have a safety
ground strap in place. The safety ground connection must be the first made and
the last removed. Any interruption of the grounding connection can create an
electric shock hazard.

WARNING!

Do NOT connect to live or energized power cable.

Observe all safety warnings marked on the equipment. These warnings identify
areas of immediate hazard which could result in personal injury or loss of life.

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Do not operate the equipment with protective covers removed. Operation
without the protective covers presents an electric shock hazard.

Use all practical safety precautions to prevent contact with energized parts of the
equipment and related circuits.

Use the recommended grounding and connection procedures. Make sure that the
equipment is grounded properly. Any interruption of the grounding connection
can create an electric shock hazard.

Refer to IEEE 510-1983 "IEEE Recommended Practices for Safety in High­Voltage and High-Power Testing" for additional information.

Do not use the portable locator or its accessories with any device or for any
purpose other than as specifically described in this manual. Misuse of this
equipment can be extremely dangerous.

Never connect the portable locator to energized equipment.

Do not use in an explosive atmosphere.

The L1071 Portable Locator uses rechargeable batteries. Replace only with sealed
lead-acid batteries as specified in Section 3, Specifications. Danger of explosion
can result if the wrong batteries are used.

If the portable locator is operated in accordance with the safety precautions
described, and if all grounds are correctly made, rubber gloves are not necessary.
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.
These notices appear in the format shown below and are defined as follows:

Warning, as used in this manual, is defined as a condition or

F

practice which could result in personal injury or loss of life.

WARNING!

G

CAUTION
Caution, as used in this manual, is defined as a condition or
practice which could result in damage to or destruction of the
equipment or apparatus under test.

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3

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

Operating & storage
temperature range

Battery type: Six 1.5 V, C-size alkaline

Battery life: Continuous: 40 hr

Dimensions: 30.3 x 3.7 x 9.4 in. (76.9 x 9.3 x 23.8 cm) (L x W x H)

Weight: 3 lb (1.36 kg)

Signal strength:

Gain control: Up/down button for automatic centering and manual control.

Dynamic range: 126 dB

Display indicated relative current simultaneously between any two
selected cables for tar get cable verification in a multi-conductor

environment.

-4°F to 133°F (-20°C to +55°C)

Intermittent: 82 hr (automatic shutoff after 10 min of nonuse)

Analog LCD bar graph. Absolute Digital Signal Strength readout
from 0 to 999.

Depth measurement
Automatic:

AVTM651070 Rev B Nov 2006

Push-button, three-digit readout to 15 ft (4.6 m) in feet-inches.
(optional m-cm)

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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.

Load matching

Output power: Normal High

815 Hz 0.6 W 2.0 W
8 kHz 0.6W 2.0 W
82 kHz 0.2 W 1.0 W
BOTH 0.12 W+.06 W 1.33 W+0.67 W
Battery type:

1070 Disposable - Eight 1.5 V, D-size alkaline

1071 Rechargeable - One 12 V, 7 Ah maintenance-free, sealed lead -acid

Battery life:

Disposable

Continuous 8 to 15 hr depending on load, frequency & power setting

Intermittent

Automatic from 5 to 2000 Ω

40 to 60 hr depending on load, frequency & power setting. 25%
duty cycle average

Rechargeable

Continuous 10 to 20 hr depending on load, frequency & power setting.

Intermittent

Operating and stora ge
temperature range:

Dimensions: 16 x 6.32 x (5-6) in. (40.6 x 16 x (12.7-15.2) cm) (L x W x H)

Weight: 8 lb (3.6 kg) with disposable alkaline cells

50 to 70 hr depending on load, frequency & power setting. 25%
duty cycle average.

-4°F to +133°F (-20°C to +55°C).

11.5 lb (5.2 kg) with rechargeable sealed lead-acid cells

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