User Guide

LOCATING BY THE PEAK METHOD - IN THE AUTOMATIC MODE

When the receiver is turned on, it will power up in the automatic peak mode. The volume control knob can be adjusted for

the amount of sound the operator wants to hear.

With the transmitter connected and operating, move out 5 to 10 feet from the transmitter and walk a half circle. Record all

of the peak signals found in the half circle and notice the absolute signal display number at each peak signal found.

Depending on the depth, the strongest signal may not be the utility being traced, but the strongest signal is a good starting

point.

When a location has been made, the bar-graph and absolute signal reading will both provide the highest value. A down

arrow will appear directly over the locate and the directional arrows and tone will not be present. Moving the receiver from

side to side will produce the directional arrows and tone change each time the receiver passes over the conductor.

LOCATING BY THE PEAK METHOD - IN THE MANUAL MODE

Locating a peak in the manual mode is the same as in the automatic mode, except the loudness control becomes the sensi-

tivity control and the left/right guidance arrows are not present. How much of the sensitivity control is being used will be

displayed in the upper left hand corner of the display as a percentage number between 0 and 100. (The number 25 will be

1/4 or 25% from a zero setting. At 50, the sensitivity control is half way to full or 50%) In the manual mode, the tone will no

longer change pitch as the receiver passes from one side of the conductor to the other side. This means, the Digi - 7 will be

acting like an analog locator using a digital display.

CAUTION: NEVER SWING A RECEIVER FROM SIDE TO SIDE. IN THE PEAK, NULL, AUTOMATIC OR MANUAL MODE,

THE RECEIVER SHOULD ALWAYS BE MOVED FROM SIDE TO SIDE WITH THE ANTENNAS PARALLEL TO THE

GROUND.

Figure 5

DEFINITION OF A PEAK: See Figure 5. A low signal reading is found on both sides of the conductor, and a high

signal is found directly over the conductor.

OPERATING INSTRUCTIONS

Direct Tracing

With the direct output cable assembly plugged into the phone jack on the transmitter, connect the red clip to the line being

traced and the black clip to the driven ground that is supplied with the instrument. When connecting the red clip lead to the

line being located, make sure the clip is attached to clean bare metal. For maximum tracing range, the ground rod should

be extended at full length and at right angles to the direction of the conductor being traced. (HELPFUL HINT - Most locates

are a short distance and the ground rod can be placed near the transmitter. It is more important to have a good ground than

extending the ground rod farther out.)

A GOOD GROUND NEAR THE TRANSMITTER WILL PRODUCE BETTER LOCATES THAN A POOR GROUND FARTHER

AWAY FROM THE TRANSMITTER. NEVER PLACE THE GROUND ACROSS OTHER UTILITIES IN THE AREA. THIS WILL

INDUCE A TONE ON THEM EVEN WHEN THEY ARE NOT USING A COMMON GROUND.

OVER ASPHALT OR CONCRETE, CLIP THE BLACK CLIP TO A SMALL ALUMINUM PLATE AND LAY IT DOWN. POUR

WATER ON THE GROUND PLATE. THIS CAN PROVIDE A GOOD LOCATE IN MOST CASES.

Turn the transmitter on with the power control at low power. The transmitter will go through a self-test on the numerical

display window. This will take several seconds. When the self-test is complete, the automatic impedance matching will set

the transmitter to the correct output tap and this number will then be displayed. The line is now ready to be traced.

Figure 2

Figure 4

Figure 3