User manual AQUA-TRONICS CABLE DETECTOR DIGI-7

[. . . ] INSTRUCTION MANUAL ON MODEL DIGI-7 CABLE LOCATOR US PATENT NO. 5th Street · Redmond, OR 97756 TEL (541) 548-2110 FAX (541) 548-2117 www. aquatronics. com aquatron@aquatronics. com I. ACCESSORIES Page # a. Matching Output Impedance in Manual Mode . Inductive Coupler used as a Receiving Antenna . [. . . ] 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 average soil or medium dry, use tap # 2. In very dry soil conditions, or with the ground plate on asphalt or concrete, use tap # 3. Tap # 4 & 5 are used for mismatching the impedance. 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. (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. 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. [. . . ] This will verify if there is an error with this locate. If the two depth readings are still not the same, care should be used when digging this locate. Other utilities are in the same area, creating a distorted field pattern. This distortion means your locate could be marked off to one side of the line actually being traced. 9 INDUCTIVE COUPLER AS A RECEIVING ANTENNA The receiver must be in the "Manual Peak Mode" when an Inductive Coupler is being used as a receiving antenna. [. . . ]