Fisher Labs TW-8800 Operating Manual

TW-8800

Operating Manual

Multi-Frequency Digital Line Tracer

F I S H E R R E S E A R C H L A B O R A T O R Y

Q U A L I T Y

Fisher detectors are renowned for their quality.

Each detector is hand crafted in the USA with pride

P E R F O R M A N C E

The worldwide underground utility industry relys on Fisher.

Our instruments are durable, dependable, and locate deeper.

R E P U T A T I O N

Fisher produced the rst patented metal detector in 1931. For

over 70 years, the Fisher logo has been a mark of excellence.

2 - YEAR LIMITED WARRANTY

Fisher believes in the products we produce and backs this belief

with a 2 year limited warranty.

Proof of purchase is required to make a claim under this warranty.

NOTE TO CUSTOMERS OUTSIDE THE U.S.A.

This warranty may vary in other countries, check with your distributor for details.

Factory warranty follows the channel of distribution.

Warranty does not cover shipping costs.

According to FCC part 15.21 Changes or Modications made to this device

not expressly approved by the party responsible for compliance could void

the users authority to operate this equipment.

S E R V I C E

Fisher is committed to providing you, our valued customer, with

superior service. Each and every instrument is rigidly tested

and carefully inspected during assembly and before shipment.

Should you have any questions or problems, contact:

FISHER RESEARCH LABORATORY

1465-H Henry Brennan,

El Paso, Texas 79936

Tel [phone] Fax [phone]

www.sherlab.com email:info@sherlab.com

8708001 04-08-10

Description .................................................................................pg. 3

Transmitter .................................................................................pg. 5

Receiver .....................................................................................pg. 6

Accessories ................................................................................ pg. 8

Operating Instructions ..............................................................pg. 9

Depth Accuracy .......................................................................pg. 12

Specications ............................................................................pg. 13

Using Headphones ....................................................................pg. 14

Treasure Hunter Code of Ethics ............................................... pg. 14

CONTENTS

NOTES

2 15

DESCRIPTION

The TW-8800 Multi-Frequency Line Tracer consists of a transmitter,
receiver, ground-plate/ground-rod assembly, a carrying case, and
an operators manual. The TW-8800 has both active and passive

locating features.

1

3

Active locating utilizes both the transmitter and the
receiver. By applying a signal with the transmitter,

the operator can trace the path of the utility with
the receiver. Different utilities respond better to
different frequencies, and the TW-8800 has three

frequencies the operator can choose from: 82 kHz,

8.2 kHz, and 820 Hz.

There are three methods of active locating that an

operator can use to trace a utility. The conductive

method is the most preferred method, since a strong
transmitter signal is transmitted through the intended

target. The operator can choose any of the three
frequencies to trace the utility. The type of utility

being traced would be the determining factor as to
which frequency to choose. The inductive method is
the easiest method to use, but may not yield the best

results. When a direct connection is not available,

but the operator has good knowledge of where one
point of the utility may be, the operator can place
the transmitter over the utility making sure that the
arrow on top of the transmitter is parallel to the path

of the utility. Inductive locating can be done at the

82 kHz and the 8.2 kHz frequencies. The third method
of active locating involves using the coupling clamp
accessory. The coupling clamp is used when the
utility is exposed, but a direct connection is not
available. The clamp jaws are opened and placed
around the utility. The clamp never makes a direct

connection with the utility; that is, the utility can

move freely with the clamp around it. This method
can only be used at the 82 kHz frequency.

14

Laws governing the use of metal detectors are common in some

areas. In many countries, the use of metal detectors is illegal or

severely restricted. DON’T LET THIS HAPPEN IN YOUR COUNTRY!

• Always check Federal, State, County and local laws before

searching.

• Respect private property and do not enter private property

without the owner’s permission.

• Take care to rell all holes and try not to leave any damage.

• Remove and dispose of any and all trash and litter found.

• Appreciate and protect our inheritance of natural resources,
wildlife and private property.

• Act as an ambassador for the hobby, use thoughtfulness,
consideration and courtesy at all times.

• Never destroy historical or archaeological treasures.

• All treasure hunters may be judged by the example you set;

always conduct yourself with courtesy and consideration of
others.

LET’S PRESERVE OUR TREASURED HOBBY

TREASURE HUNTERS’ CODE OF ETHICS

Using headphones (not supplied) improves battery life, and
prevents the sounds from annoying bystanders.
It also allows you to hear subtle changes in the sound more

clearly, particularly if searching in a noisy location. For safety

reasons, do not use headphones near trafc or where

other dangers are present. This device is to be used with
interconnecting cables/headphone cables shorter than three

meters.

USING HEADPHONES