Fisher Labs XLT-30 Manuel utilisateur

XLT-30

Operating Manual

Acoustical Leak Detector

FISHER RESEARCH LABORATORY

OPTION A

with BIG FOOT

OPTION B

with NEW MULTI-SENSOR

OPTION C

with LITTLE FOOT

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

TestEquipmentDepot.com

INTRODUCTION

Fisher Research Laboratory has always been a leader in the eld

of acoustical leak detection. From the early LT-10 through the

XLT-30, high quality sound amplication has been synonymous

with the Fisher name .

Fishers XLT-30 takes leak detection to a new level. Ultra sensitive

sound microphones, combined with a non-distortion amplication

system and crystal clear audio headphones make the XLT-30

the leak detector destined to set new standards for the leak

professional.

CONTENTS

Introduction ...............................................................................pg. 2

Headphones..............................................................................pg. 2

Instrument Set ............................................................................pg. 3

Control Panel.............................................................................pg. 6

Operating Instructions ..............................................................pg. 8

Use of the Multi-Sensor..............................................................pg. 9

Specications ............................................................................pg. 11

USING HEADPHONES

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.

INSTRUMENT SET

OPTION A

OPTION C

OPTION B

1. Control Box

All listening and  ltering controls for the XLT-30 are contained in this sturdy

housing. The function of each control is described in the section entitled

“Faceplate and Controls”.

2. Big Foot Sensor - OPTION A

Also known as the Ground Microphone, this sensor is to be used on hard

surfaces, concrete, asphalt, tile, etc. A ﬂ exible rubber shield helps pre-

vent outside sounds from interfering with the sounds from the buried pipe.

Press and hold the red button near the handle to mute the audio from

the probe and suppress loud sounds when the probe is moved.

2A. Little Foot Assembly - OPTION C

About the size of a computer mouse, this small handheld sensor is de-

signed for areas that the Big Foot Sensor can not  t into. The Little Foot

assembly is normally used for leak detection inside buildings. Mute is

activated by pressing the button in front of the Little Foot Assembly.

2B. Multi-Sensor - OPTION B

Fisher’s new MULTI-SENSOR has superior leak detection capabilities. In an

extremely compact design, Fisher has achieved higher performance,

improved audio clarity, improved sensor electronics, and better sensitivity

to leaks with less background noise – all with heavy duty characteristics

of the trusted Big Foot. The MULTI-SENSOR is used for both the ground

microphone and direct contact applications – the one sensor that does

it all. Fisher’s NEW XLT-30 MULI-SENSOR combo sets the new standard for

leak detection.

3. Hydrophonic Cylinder Probe

This probe is a direct contact probe designed to make direct connection

to the pipe, or any portion of the pipe that is accessible. Used in any

combination of Sound Rods with the T-Handle, pipes can be accessed

to distances up to nearly 6 feet away.

Another feature of the Cylinder Probe is the ability to listen to pipe noise

in pipes that are buried in turf, or soft surfaces. Accurate pipe location

is essential for the placement of the Ground Rods as close to the pipe

as possible.

On top of the Cylinder Probe is a three position toggle switch for mute,

listen, and momentary listen. As with all mute controls, learn to use them

wisely.

When tightening the sounds rods to the Hydrophonic Probe, secure the

connector with a wrench as to not let it twist. Twisting of that connector

could damage wiring on the inside of the probe.

INSTRUMENT SET

4. Sound

Rods

Two different sizes are included with the XLT-30. Rods give the user vari-

ous lengths for direct or indirect contact to pipes.

5. T-Handle

This handle is used primarily with the Cylinder Probe and the sound

rods.

5A. Multi-Sensor Handle

This handle is used with the Multi-Sensor

6. Headphones

These headphones are designed to deliver the clearest sound with the

least distortion. The Volume knob can be used to adjust the audio level.

Unplugging the headphones will turn off the XLT-30. When the XLT-30 is

turned off, any modications to the Volume, Notch, and Filter will return

to the factory presets.

7. Probe Cable (Option A & C)

This cable attaches at the back of the Control Housing to any of the

various probes. Make sure the jack is fully inserted and the lock nut is

hand tightened.

8. Carrying Strap/Housing Mounting Bracket

The attachment system for the XLT-30 consists of a plastic mounting

bracket that slides from the bottom of the control housing up to the bezel

around the faceplate. There are two slots for attaching an adjustable

strap that hangs around the neck of the user.

INSTRUMENT SET

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

TestEquipmentDepot.com

CONTROL PANEL

POWER

This pad turns the XLT-30 on or off. When the instrument is turned Off, all set-

tings, or modications to settings default to the preset factory settings.

LIGHT

Press Light pad to turn the back light on or off. Prolonged use of the back

light will have minimal effect on the battery life of the XLT-30.

VOLUME

Press Volume pad to modify the volume of the XLT-30. The arrow keys (up

arrow/down arrow) increase or decrease the volume to the headphones.

Use the headphones volume knob to reduce audio as desired.

NOTCH

This control allows the user to mask or reject a small range of frequency

response. Its purpose is to eliminate a sound (i. e. motor, humming, fans,

etc.) that may be interfering with the leak sound. The notch setting can

be moved with the arrow keys.

FILTER

The XLT-30 has four different ltering modes.

AL (All Frequencies) – This is the No Filter feature of the XLT-30. No

modications to the signal can be made with the arrow keys. Frequency

range of the All Frequency setting is from 60 Hz to 6 kHz.

(The following lter modes have a frequency range from 60 Hz to 2.4

kHz)

HI (High Range) – This ltering mode allows the user to adjust the

response in the higher areas of the frequency range. Use the arrow keys

to increase or decrease this frequency response range.

LO (Low Range) – Similar to the previous lter mode, the lowpass

lter allows the user to listen to the lower areas of the frequency range.

The arrow keys are used to increase or decrease this frequency response

range.

FC (Frequency Choice) – This lter could also be called Frequency

Select. This mode allows tuning to the frequency that gives the user the

best response. The arrow keys are used to move the cursor, selecting a

narrow frequency band of choice

HOLD/MUTE

This dual purpose button is both a mute control and a peak hold

reset control.

Mute – As the name applies, muting disengages the sound to the

user. There is also a control on all listening microphones. Learn to use

this control to prevent excessive noise to your ears when the probes are

moved.

Hold – The display of the XLT-30 will show the highest sound level

recorded. This reading can be reset by pressing this pad. Resetting the

Peak Hold clears earlier readings of the Peak sound.

ARROW KEYS

These keys allow features of the XLT-30 to be modied.

RESUME

After any modication has been made to the XLT-30 (VOLUME, NOTCH,

or FILTER), depressing the RESUME will return the display screen back to

a Meter function (Sound Graph).

CONTROL PANEL

OPERATING INSTRUCTIONS

Set Up

1. Assemble control housing, headset, and your choice of listening probe.

The headset must be plugged in for the XLT-30 to operate.

2. Press POWER pad to turn On the XLT-30. The XLT-30 goes through a ve

second warm up before the touch pads are functional. During this time,

the display screen gives information of battery level. A reading of 68 or

below will activate the “Low Battery” indicator. The XLT-30 does have a

usage buffer between the “Low Battery” indicator and complete system

shut down to allow you to complete a job.

3. The XLT-30 always turns on to the default settings. Volume is at the me-

dium setting, lter is in the All Pass (no lter) mode, and the notch control

is at the midway point. The display screen will show the sound intensity

in a bar graph form (Sound Graph) and two digit display.

4. Familiarize yourself where the mute buttons (and pad) are. Remember

to mute the XLT-30 when moving any probe.

5. Press the VOLUME pad to modify headset volume. Use the ARROW

pads to increase or decrease the volume. The display screen will show

the volume level in a graph form. Press the RESUME pad to exit volume

modication and return the display screen to the Sound Graph func-

tion. (Remember that the volume can be adjusted at the headphones

also.)

6. Begin your leak detection search.

Modications During Leak Search

Some leaks are small in size, and unrecognizable, or conditions are such

that very little leak sound can be recognized, so you may need to make

changes to the lter(s) in order to hear leaks. Depending upon the type

of pipe composition and soil (ground) type, different lter settings will

increase your ability to hear the leak sound.

Adjustment to the lter is done by pressing the FILTER pad which will

allow you to scroll through four different lter types. Frequency range

modications can be made to the HI, LO, and FC lters. As you are

choosing your lter, the display screen will give a visual display of the

lter type being used, and the frequency range of that lter. After your

selection and modication is made, depress the RESUME pad to return

to the Sound Graph function of the display screen.

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

TestEquipmentDepot.com

Use of the Notch Filter

Occasionally, you may come across a sound that may be

masking or covering your ability to adequately hear any leaks.

This may be caused by nearby motors, fans, or many other

annoyances. (Unfortunately, the most common are sounds

caused by automobiles and traf c). The XLT-30 has a notch, or

reject feature, that will assist in eliminating that sound from your

frequency range.

Press the NOTCH pad, and use the ARROW pads to move the

cursor to the point where the annoying sound is eliminated or at

its weakest. Depress the RESUME pad to set the notch function.

(Hint: Depress the FILTER pad to go directly to the FILTER mode.

Now you can choose the type of Filter you wish to use AND still

have the annoying sound Notched).

Use of the Multi-Sensor (OPTION B)

Unlike our other sensor, this new sensor was designed for locating

leaks in all types of surface conditions. The new sensor construction

will allow leak detection to be performed on hard surfaces such

as concrete, asphalt, tile, etc, as well as listening to water leaks

under turf or soft surfaces.

OPERATING INSTRUCTIONS

as concrete, asphalt, tile, etc, as well as listening to water leaks

On hard surfaces, the muti-

sensor sensor is used to pick

up the vibrations generated

by a buried ruptured pipe

located underneath sidewalks

or paved streets. The rubber

housing diaphragm is

designed to reduce external

sounds while the sensor rests

on a hard surface and detects

the vibrations traveling

underground.

NOTE: This equipment has been tested and found to comply with the limits

for a Class B digital device pursuant to Part 15 of the FCC Rules. These

limits are designed to provide reasonable protection against harmful

interference in a residential installation. This equipment generates, uses,

and can radiate radio frequency energy and, if not installed and used

in accordance with the instructions, may cause harmful interference to

radio communications. However, there is no guarantee that interference

will not occur in a particular installation. If this equip ment does cause

harm ll interference to radio or television reception, which can be

determined by turning the equipment off and on, the user is encouraged

to try and correct the interference by one or more of the following

measures:

- Reorient or relocate the receiving antenna.

- Increase the separation between the equipment and the receiver.

- Connect the equipment into an outlet on a circuit different from that

to which the receiver is connected.

- Consult the dealer or an experienced radio/TV technician for help.

When utilizing the multi-sensor for direct

connection to a pipe, or listening to buried

pipes located in soft ground or under a

turf surface, you will need to use the T-

Handle and sound rods included with the

unit. Using a threaded spacer provided on

the extension handle, carefully attach it

directly onto our sensor probe. Assemble

the T- Handle by snapping both the

extension handle and probe handle

sections together. Sound rods are then

secured to the threaded coupler on the

T- Handle assy. Sound rod lengths will be

determined on its application.

USE OF THE MULTI-SENSOR (OPTION B)

SPECIFICATIONS

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