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Locating Tips:
Magnetic Locators and Circuits
Magnetic
locators such as the GA-52Cx and GA-72Cd can be used to
determine if a circuit is active, such as an automobile rear
window defogger grid, or a radiant heat panel. Set the
sensitivity of the locator on high, and place the instrument
sensor (the tip) near the window grid, ceiling panel, etc.
Listen for a change in the output tone when the circuit is
activated by its on/off control.
Searching Near a
Fence
Searching in the vicinity of a chain link fence requires a
reduced sensitivity setting and also some control over the
orientation of the locator. As illustrated in Figure 13,
position the locator horizontally, with its long axis
perpendicular to the fence. This ensures that the upper sensor
is kept away from the fence.
Perform the search by
slowly moving the locator forward along the fence while also
moving it in to the right and to the left. This technique allows
you to search an area several feet wide as you move forward.
Listen for an abrupt drop in the signal, (as shown by the null
in Figure 14.) that will occur when the lower sensor, located
1-5/8 inches from the end of the locator, is directly over the
stake. Any variation in the position of the locator will produce
an abrupt rise in the frequency of the signal. |
