Fisher TW-82P Manuale utente

TW-82

Operating Manual

DIGITAL LINE TRACER

WITH PASSIVE POWER DETECTION

Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176

TestEquipmentDepot.com

CONTENTS

Introduction ....................................................................... 3

Contents................................................................................4

Transmitter .................................................................... 5-7

Inductive Locating .....................................................7

Conductive Locating ..................................................7

Receiver ......................................................................... 8-17

Control Panel ...............................................................8

Standard Mode ....................................................... 9-11

Lateral Mode ......................................................... 12-14

Lateral Tracing Operation ............................... 13

Lateral Mode Programming ............................ 13

Passive Power Mode ............................................ 14-16

Auto Power-Down Receiver.................................... 17

Metric/Imperial Unit of Measure .......................... 17

Speciﬁcations .................................................................. 18

Accessories......................................................... Back page

INTRODUCTION

The TW-82P Digital Line Tracer components include a

Transmitter, Receiver and Ground-Rod Assembly.

The TW-82P is an active single-frequency and passive power

current line tracer that is used to locate and trace buried

utilities using any of the following four tracing methods:

1. Conductive Method. With this method, the Transmitter

energizes the buried utility by making a direct electrical

connection to it with Conductive Tracing Cables. In most

cases, this method generates the strongest magnetic eld for

the Receiver to detect above ground.

2. Inductive Method. When a direct physical connection

to the utility is unavailable, the utility may be energized

indirectly by magnetically coupling an energizing current

from the Transmitter. Some prior knowledge of the utility’s

location is required so that the Transmitter can be placed

and oriented, on the ground, near the utility in the most

effective manner.

3. Coupling. In some cases a utility may be exposed, but

does not provide a direct connection for the conductive

tracing cables. The optional accessory coupling clamp can be

clamped around the exposed utility to magnetically couple

an energizing current from the Transmitter into the utility.

4. Passive Power. 50Hz and 60Hz electric current ows on

underground power lines and also on underground utilities

that are not power lines. In Passive Power Mode, the TW-82P

can detect this electric current using the Receiver as a stand-

alone instrument without need for a transmitter.

Never make direct contact with electrical or communication

lines that are in service. To trace such lines in service,

perform an inductive trace, either with or without the

coupling clamp.

Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176

TestEquipmentDepot.com

CONTENTS

Carrying Case

Ground-Rod Assembly

(Ground-Rod & Conductive Tracing Cables)

Receiver

Transmitter

6 D-cell Batteries

Operator’s Manual Calibration Certiﬁcate

TW-82

TRANSMITTER

TW-82P Transmitter

The Transmitter has two controls: & .

The button has a dual function:

1. When the Transmitter is powered on, switches

the device between normal (1/4 watt) and high (1.0 watt)

output.

2. With the Transmitter powered off:

A. Press-and-hold to program the Auto

Power-Down feature.

Successive presses of will show a ashing

battery indicator, followed by a blank screen or the

illuminated battery indicator.

• An illuminated battery indicator means

Auto Power-Down is activated.

• A blank screen means Auto Power-Down

is deactivated.

B. After you release , the transmitter

power will turn on.

With the Auto Power-Down feature activated, the

Transmitter will automatically turn off 60 minutes after

the last key-pad press by the user. This is a battery

saving feature. The Transmitter will warn of power-down

by switching ON and OFF as described on the top of the

following page.

TW-82P TRANSMITTER

WARNING: Do not handle output leads unless power is off.

ELECTRIC SHOCK HAZARD: Servicing to be performed

by qualied personnel only.

NEVER connect conductive cables to an energized power

line.

Low Battery Power-Down Warning

When the Transmitter batteries are near the end of their

useful life, the Transmitter will warn the operator before

shutting down.

Five minutes before shutting down, the Transmitter will

alternately stop and start transmitting at approximately one-

second intervals. The operator using the Receiver, even at a

distance from the Transmitter, will notice the signal turning

on and off before the power turns off completely.

Accessory Output

1. Flip up the black protective cover to expose the

Accessory Output Jack.

2. Connect the conductive tracing cable plug for conductive

tracing.

When the conductive tracing cable is connected, Signal

Current will be displayed. The Signal Current Bar Graph

shows the quality of the connection.

Vertical Bars will illuminate to indicate the current

as follows:

mA indication 1 2 4 8 15 25 50 100 200

Actual Range (mA)

0.5-1.4 1.5-2.9 3.0-5.9 6.0-12.9 13.0-18.9 20.0-39.9 40.0-74.9 74-149 150+

Automatic Load Impedance Matching adjusts output to

provide full rated power over a wide range of loads (e.g.

utility types and conditions). It is tolerant of both dry

(high resistance) and shunted (low resistance) ground

connections.

The Transmitter has a built-in antenna for inductive

locating. When the Cable Jack is not connected, the inductive

antenna automatically engages and begins transmitting.

When locating inductively, the Signal Current Bar Graph

will not be displayed, as there is no conductive trace load to

be measured.

INDUCTIVE LOCATING

Inductive locating is most effective with

the Transmitter straddling the utility as

illustrated, with the utility perpendicular to the

Transmitter’s batteries.

If the utility direction is unknown, place

Transmitter on the ground, power on,

and sweep the Receiver a complete

360º around the Transmitter, keeping

at least a 25-foot (8-meter) distance

between the Transmitter and Receiver.

If unsuccessful, move the Transmitter

to another location. When located, the

Receiver’s azimuth indicator will show the

direction of the utility.

In inductive mode, the Transmitter’s LCD

will not display Signal Current. When the

conductive tracing cables are plugged in, the

Signal Current display will illuminate.

CONDUCTIVE LOCATING

1. Place the Transmitter on the

ground and turn it off.

2. Connect the Conductive Tracing

Cables to the Transmitter.

3. Push the Ground Rod into

the earth at a 90º angle to the

direction of the utility.

4. Connect the red clamp to the non-

energized utility.

5. Connect the black clamp to the Ground Rod.

Be sure not to place the wires over any other

utility.

6. Turn Transmitter On.

7. With Receiver in hand, move at least 25 feet

(8 meters) away from the connection point.

8. Sweep the Receiver in a circle around the

connection point.

9. Using information provided on the display,

nd the areas that need to be traced and analyze the

situation in more detail to nd the buried utility.

TW-82P TRANSMITTER

Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176

TestEquipmentDepot.com

TW-82

RECEIVER

TW-82P Receiver

CONTROL PANEL

1. Press-and-Hold to turn ON.

2. Press-and-Hold to turn OFF.

3. Choose Metric/Imperial unit of measure (see instruction p17).

Press to select volume settings

• In Standard and Lateral Modes, tap

the button to adjust volume:

1. Mute 3. Medium Volume

2. Low Volume 4. High Volume

• In Passive Power Mode, no mute is available.

Only volume settings 2, 3 & 4 are available.

Press to select from any of 3 modes

Adjust GAIN in Passive Power Mode

These keypads have no function in the Standard or

Lateral Modes.

Standard Lateral Passive Power

TW-82P RECEIVER

STANDARD MODE

In this default conguration, the TW82P Receiver requires no

operator intervention to trace a line under most circumstances.

Only the volume can be adjusted in this mode.

The following values & conditions are displayed on the LCD display

in Standard Mode:

- Signal Strength

- Left/Right & Over-Target

- Azimuth

- Current Measure

- Depth

- Battery Strength

1. Signal Strength: Indicates your proximity to the center of the

electromagnetic eld emitted by the utility.

999: maximum value

0: minimum value

You may nd different locations

where the Signal Strength value is

high. Use this reading as a relative

indicator as to where the utility is

located. Signal Strength is strongly

inuenced by the depth of the

utility.

2. Left/Right & Over-Target: These indicators show your position

relative to the center of the electromagnetic eld.

Move to Move to You are over

the left the right the target

TW-82P RECEIVER

Audio: When you move within a 45º angle of the center of the

electromagnetic eld, the audio pitch will change; the pitch

increases as you approach the utility. Outside the 45º zone, the

pitch does not change.

When the Receiver is directly over the utility, it goes silent. The over-

target indicator, •, also appears when the Receiver is directly over

the utility.

PITCH INCREASES

AS YOU APPROACH THE UTILITY

NO SOUND

DIRECTLY OVER UTILITY

CONSTANT

PITCH BEYOND 45°

CONSTANT

PITCH BEYOND 45°

45°

VOLUME DECREASES WITH DISTANCE FROM UTILITY

When you are standing to the right of the utility, you will hear

a constant tone, and to the left, a pulsating sound.

3. Azimuth: These rotational arrows indicate the utility’s path

relative to your position. The arrows will point in the direction of

the utility’s path as the Receiver is

rotated near a burried utility.

STANDARD MODE continued

4. Current Measure:

mA (milliamperes) of current

owing on the conductor.

Use Current Measure as an aid

for distinguishing utilities in close

proximity. The Current Measure

will generally be the highest on the

utility you are connected directly to,

regardless of the utility’s depth.

Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176

TestEquipmentDepot.com

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