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Following are some general points regarding the ultrasonic function:
¾ The ultrasonic function in the receiver is independent of the transmitter receiving functions.
¾ A single click to activate the ultrasonic function can be used an unlimited number of times without
affecting the receiver’s calibration.
¾ The ultrasonic measurement is held in memory until the trigger is clicked again for a new ultrasonic
measurement or until the receiver turns off.
¾ The
ultrasonic measurement will be reset to zero after completing a 1-point calibration.
¾ The ultrasonic setting will require resetting after a 2-point calibration.
Setting the Ultrasonic Distance or
Height-Above-Ground Measurement
1. Hold the receiver comfortably and level in your hand as you would during locating/tracking.
2. Click the trigger (the receiver must already be powered up). This will initiate the ultrasonic measure-
ment.
3. A single tone is emitted during which the ultrasonic distance is displayed for 2 seconds in the bottom
window before the depth/distance display resumes. The bottom window will now display the
transmitter’s depth below the ground instead of the total magnetic distance.
Zeroing the Ultrasonics
1. Set the receiver on the ground or against some other flat surface.
2. Click the trigger (the receiver must already be powered up). This will initiate the ultrasonic
measurement.
3. The receiver will beep 3 times and display a “0” in the bottom window for 2 seconds before the depth
display resumes.
IMPORTANT: If another crew member takes over the locating and does not reset the ultrasonics, the
depth display may be inaccurate. For instance, if one person holds the DigiTrak Receiver comfortably 20
inches (50 cm) above the surface of the ground, and another person begins to locate the tool by setting
the DigiTrak on the ground (without zeroing the ultrasonics), the tool will appear to be 20 inches shallower
because the DigiTrak is still subtracting the 20-inch ultrasonic distance.
NOTE: If by chance the trigger is clicked twice within a 1 or 2 second period, the receiver will
enter into a 2-point calibration mode. Wait until all the tones stop before touching the
trigger again. Otherwise the calibration could be changed.
12 DigiTrak
®
Mark III Operator’s Manual