Fisher TW-82P Manuel utilisateur
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
2
INTRODUCTION
3
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
4
CONTENTS
Carrying Case
Ground-Rod Assembly
(Ground-Rod & Conductive Tracing Cables)
Receiver
Transmitter
6 D-cell Batteries
Operator’s Manual Calibration Certificate
5
TW-82
P
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.
6
TW-82P TRANSMITTER
WARNING: Do not handle output leads unless power is off.
ELECTRIC SHOCK HAZARD: Servicing to be performed
by qualied 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.
7
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
8
TW-82
P
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
9
TW-82P RECEIVER
STANDARD MODE
In this default conguration, 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
inuenced 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
10
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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