Dunham & Morrow DML2000, DML2000-XR, DML2000-XRM User Manual

By Schonstedt Instrument Company

Tel: [phone]  Fax: [phone]

[e-mail]

DU

NHAM & MORROW

 www.magneticlocator.com

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Quick Start Instructions

Make yourself magnetically clean. Typical items k nown to be magnetic include, but are no

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lim

ited to watches, key rings, pocket knives, belt buckles, and shoes with steel t

pr

otectors

HOLD the instrument by the pistol grip located below the Electronics Box and on the top of

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the instrument’s Sensor Tube

Turn the Volume Switch clockwise to activate the instrument and set the volume to a

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comfortable level.

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Set the Sensitivity Switch to position 3.
Sweep the unit back and forth in front of you as you walk and search the area. Wi

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m

agnetic (ferrous) targets present, the unit will idle at approximately 20 hertz. As y

appr
For strong or shallow targets, raise the unit approximately 12 inches above the ground or

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select a lower sensitivity setting. Conversely, for weak or deep targets you may wish to
increase the instrument’s level of sensitivity.

.

.

oach a ferrous target, the frequency will increase and peak directly over the target

t

oe

th no

ou

.

Always remember that the DML2000-XRM and DML2000-XR are precision instruments

and should be treated accordingly.

The DML2000-XRM is identical to t he DML2000-XR with the exception that it also includes a
visual display (a full 3 ½ digital LCD panel meter) in addition to the audio output.

NEVER use the DML2000-XR as a substitute for a shovel

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Table of Contents

Introduction ................................................................................................................... 4

Theory of Operation ...................................................................................................... 5

Magnetic Cleanliness ................................................................................................ 5

Operation ....................................................................................................................... 6

Sensitivity Setting ...................................................................................................... 6

Audio Output ............................................................................................................. 6

Pinpointing your Target ............................................................................................. 7

Panel Meter (DML2000-XRM only) ............................................................................ 7

Common Magnetic Signatures ..................................................................................... 8

General Specifications ............................................................................................... 14

Warranty & Service ..................................................................................................... 15

Table of Figures

Fig. 1: Sensor Location ................................................................................................... 5

Fig. 2: Instrument Controls .............................................................................................. 6

Fig. 3: Meter Option ........................................................................................................ 7

Fig. 4: Survey Marker/Well Casing .................................................................................. 8

Fig. 5: Chain-Link/”Cyclone” Fences ............................................................................... 8

Fig. 6: Horizontal Pipe ..................................................................................................... 9

Fig. 7: Service Connections/Valve Boxes ...................................................................... 10

Fig. 8: Septic Tank ........................................................................................................ 10

Fig. 9: Manhole Cover ................................................................................................... 11

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Introduction

The state-of-the-art DML2000-XR Magnetic Locator packs all of its sophisticated electronics
into a nicely balanced, water resistant package weighing less than 2 pounds. O-rings are used
to shock mount the sensors and thus ensure proper instrument operation. The electronics’
housing is water resistant and unaffected by rain and snow; the sensor tube is waterproof and
can be submerged in shallow water up to 3 feet.

The unit has six sensitivity settings for better control. Nor mal locates are performed on setting
two or three. Lower settings may be used for large, relatively shallow targets; higher settings
work best for weak or deep targets. The instrument audio output idles at a nominal 20 Hz when
no magnetic objects are present and increases whenever the DML2000-XR approaches a
magnetized object.*

The DML2000-XR Magnetic Locator is the ideal instrument for locating survey markers, septic
tanks, buried iron or steel pipes, water valves, water meters and any other ferrous objects
covered by dirt, pavement, water, snow or ice. The capabilities of this instrument are unlimited,
and an experienced operator will find many uses for the DML2000.

The separate Power/Volume and Sensitivity controls allo w the operat or to leave the Sensiti vity
control in a favorite or preset position, deactivate the instrument and later resume operation
with this setting unchanged.

There is no need to worry about the instrument battery level. A built-in Low Battery indicator
begins flashing whenever the operator has 2 to 3 hours of normal operation remaining.
Typically the DML2000-XR will provide over 60 hours of operation from a set of 4-AA, alkaline
batteries. Using lithium batteries can increase this to over 100 hours of operation.

*BEWARE! A strong warble output from the instrument means you are probably over an
energized power line; a weak warble output often indicates the presence of a telephone or
communications cable.

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