Digitrex 3-3000-00a-F manual Ultrasonic Function, Temperature Range

® Receiver

Warning Tones for Transmitter Overheat

Beginning with firmware version 3.76, the DigiTrak Receiver will emit a series of increasing warning tones to signal transmitter overheating as follows:

Temperature Range

Warning Signal

14°C and below	No audio or visual warnings.
15°C to 35°C	One double tone with every 4°C increase in temperature.
36°C to 45°C	Two double tones with every 4°C increase in temperature.
45°C to 60°C	Three double tones with every 4°C increase in temperature.
60°C and above	Audible error tones (two long tones) and the bottom window will flash;
	1999 may appear when the transmitter shuts down at about 80°C.

Ultrasonic Function

The ultrasonic function measures the receiver’s elevation above the ground and subtracts that distance from the total magnetic distance to calculate the depth of the transmitter below the ground’s surface. The ultrasonic function is de- signed to help the operator observe the depth reading while maintaining separation between the receiver’s antennas and potential sources of interference. An ultrasonic measurement can only be taken after start-up is completed.

The ultrasonic function is particularly useful when:

¾Locating over obstacles.

¾Obtaining adequate separation from utilities in the ground or rebar interference.

¾Locating above water.

¾Verifying calibration when the transmitter is underground.

¾Recalibrating in the ground (see “2-Point Calibration” below).

Ultrasonic

Measurement

Magnetic

Distance

Depth	Surface of
	Ground

Depth = Magnetic – Ultrasonic

Use of Ultrasonic Measurement

To Determine Actual Depth

The ultrasonic measurement is made by emitting and receiving signals from the two small round holes/ where transducers are mounted on the bottom of the receiver. When the trigger is clicked, one transducer emits a high-frequency sound wave that travels to the nearest surface and bounces back to be received by the other transducer. The time required for the signal to return is used to calculate the distance to the ground. The operating range of the ultrasonic measurement is between 12 inches (30 cm) and 90 inches (230 cm). The ultrasonic measurement is displayed in the bottom window for 2 seconds after the trigger is clicked one time.

DigiTrak® Mark III Operator’s Manual 11