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Schonstedt - Model GA72 CD -Fluxgate Magnetometer
The Model GA-72Cd Magnetic Locator detects the magnetic field of ferromagnetic objects. It responds to the difference in the magnetic field between two sensors winch are spaced about 14 inches apart. The GA-72Cd is unique because it provides an audio signal, and visual indications of both signal strength and polarity. Although most objects can be located using either of the indications, simultaneous use of both types will help you pinpoint a target and determine its orientation and identify magnetically detectable nonmetallic duct and cable.
Figure 1 illustrates an application of the locator in which it is used to detect an iron marker of the type used for property line identification. As shown, the magnetic field of the iron marker is stronger at sensor A than it is at sensor B. As a result, the frequency of the audio signal is higher than the idling frequency. 40 Hz. which exists when the field strength is the same at both sensors. This stronger signal also causes the digital indication to peak in either the positive or the negative direction when the audio signal is at its highest frequency.