CST/Berger Magna-Trak 102 INSTRUCTION MANUAL
INSTRUCTION MANUAL
Magna-Trak 102
®
Magnetic Locator
Table of Contents
Introduction ..............................................................................2
Theory of Operation ..................................................................3
Features ....................................................................................4
Pictorial Description .................................................................5
Basic Operation and Description .......................................... 6-9
Field Operation .......................................................................10
Signal Responses ............................................................. 11-13
Locating Near a Steel Fence ...................................................14
Specifi cations, Warranty & Service .........................................15
Introduction
The Magna-Trak 102 magnetic locator is a fl ux-gate type of mag-
netometer which incorporates a unique patented technology that enables
the factory to balance the magnetic sensing coils to a fi nite condition. This
patented method of magnetic balancing is more advanced in the state-ofthe-art technology.
The Magna-Trak 102 implements “peak response” over
ferromagnetic objects by yielding on increasing audio signal as the object
is approached and passed over.
This instrument is the product of many years of experience and service provided by Chicago Steel Tape to the industry.
2
Theory of Operation
The Magna-Trak 102 locator fi nds ferromagnetic objects by sensing
the magnetic fi eld radiated by the object. The locator contains two sensor coil assemblies that are precisely spaced and electronically balanced
to achieve a near magnetic balanced operating condition. In a uniform
magnetic fi eld, such as the earth’s fi eld, the two sensor coils maintain
a magnetic balanced status, because both of the coils experience the
same magnetic lines of force. However, when a ferromagnetic object is
approached the fi eld strength and angle of the magnetic lines upon each
sensor is different. This difference, although minute, is enough to offset the
critical balance and produce an audible indicating signal.
When no ferromagnetic objects are present, the speaker emits a steady
low frequency tone. As the object is approached, the audio frequency increases until the center of the object is directly beneath the locator’s lower
tip. The frequency peaks and then decreases as the object is passed. The
peak indicates the exact location of the object.
Nonferrous objects do not effect the locator. Objects made of brass,
aluminum, copper, etc. are ignored.
Sensor coils unbalanced by iron stake’s magnetic fi eld.
3
Features
1. Instrument Control Panel
a) LCD Visual Display
b) Water-repellant push button switch operation
2. LCD Visual Display
a) Two digit numeric signal indicator
b) Expanding analog bar graph signal indicator
c) “Low Battery” alert fl ashing indicator
d) Displays “ferrous” model operation
e) “Caution: Power Line” alert fl ashing indicator
3. Water-repellant push button operation, single action
a) “ON” – power ON
b) “OFF” – power OFF
c) “ERASE” – Interferences such as a nearby fence are virtually
erased allowing the signal to return to the normal audio tone.
4. Rugged high impact plastic enclosure with aluminum sensor pole.
5. Powerful magnetic speaker constructed with waterproof Mylar cone.
6. Six AA 1-1/2 volt battery operation.
7. Approximately 25 hours battery life under typical conditions.
8. Sensitivity control, single turn, continuously variable wide range
depth adjustment.
9. Volume control, single turn continuously variable adjustment for
selection of audio intensity.
10. Ergonomically designed for light weight, comfortable balance for
easy handling.
11. Flip out battery compartment cover for easy battery access.
12. Signal “peaks” over magnetic objects.
13. Excellent depth capability.
14. Includes padded carrying case with shoulder strap or hard case.
15. Deep tone audio under search conditions.
16. Water-resistant construction.
4
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