User manual AQUA-TRONICS CABLE DETECTOR DIGI-7

[. . . ] 5th Street · Redmond, OR 97756 TEL (541) 548-2110 FAX (541) 548-2117 www. aquatronics. com aquatron@aquatronics. com I. ACCESSORIES Page # a. . 10 1 DIGI-7 The Digi-7 line locator is two locators built into one. Both receiver and transmitter will operate in a full automatic mode or a full manual mode with the push of a button. ACCESSORIES FOR THE MODEL DIGI-7 LINE LOCATOR The Model I. C. 49, I, C, 56, or I. C. 56WT Inductive Couplers are used to help identify one line from other utilities even though they are sharing a common ground. [. . . ] If the transmitter is in the automatic mode, the numerical display will set itself to the correct tap number for the best locate. If the soil conditions or power level change while locating, the transmitter will track that change. If for some reason manual selection of the output is required, the following guidelines should be noted. MATCHING THE TRANSMITTER IMPEDANCE IN THE MANUAL MODE In wet soil, tap # 1. In very dry soil conditions, or with the ground plate on asphalt or concrete, use tap # 3. If unsure as to what tap number is needed, make your output connection and turn the transmitter on. 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 sensitivity 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. 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. 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. 6 DEFINITION OF A NULL - See Fig. A high signal reading is found on both sides of the conductor, and a loss of signal is found directly over the conductor. Figure 6 LOCATING BY THE NULL METHOD - IN THE AUTOMATIC MODE The receiver will always power up in the AUTOMATIC PEAK MODE OF OPERATION. Turn on the receiver and rotate the large knob until the desired level of sound is being heard. A little flag at the lower left corner of the display will point to NULL. Move out 5 to 10 feet from the transmitter and walk a half circle around transmitter until the bar-graph display starts to increase. [. . . ] When the bubble is half way between the center ring and the outer black housing, the instrument is at a 45º angle. When the line has been located and marked, move off to one side of the location with the bubble set at 45º. Move away until a null point has been found with the nose of the antenna touching the ground. The sensitivity control may have to be adjusted while making a depth reading. [. . . ]