ELECTRICAL INTERFERENCE

POWER LINE SIZES RECOMMENDED FOR AQUA PROBE DIGITALS

TM-55-1930-209-14P-17 Water Purification Barges (NSN 1930-01-234-2165) Miscellaneous Equipment Dayroom Workshop Access and Sanitation Systems Manual
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Quantity Description Use 2 each 114 - 20 x 3/8" slotted Attaching panel/bulkhead mounting pan-head machine screws adapter flange to case 4 each #6 x 1/2" Phillips oval- Attaching panel/bulkhead head self-tapping screws mounting adaptor flange to panel 2 each #10 x 3/4" slotted pan- Attaching U-mounting bracket to head self-tapping screws surface 2 each Thumb screws and rubber Attaching U-mounting bracket washers to case Note: additional hardware is provided for mounting the transducer to the boat, as noted in the TRANSDUCER MOUNTING section of this manual. As noted above, any Aqua Probe digital unit is designed to operate from a standard 12V-DC, negative ground marine electrical system. This type of system actually can provide a range of voltage between 11 and 16 volts, depending on the condition of the battery and the alternator charging characteristics. The normal voltage of such a system may average about 13.6V-DC. Your Aqua Probe digital is designed to operate normally within that 11 to 16V-DC power range. However, operation outside of that range could cause damage or a degredation in performance. IMPORTANT: AN EXTERNAL FUSE IS REQUIRED. Because fuse or circuit-breaker panels commonly are used on modern boats, there is no internal fuse or circuit breaker in your Aqua Probe digital depth instrument. Although the normal, average current requirement of these units is only about 0.2 amp (0.3 amp with the night light on), there will be a current surge which occurs rhythmically during the "transmit" phase of depthfinding operation. The pulse can be on the order of several amperes. Accordingly, a ONE-AMPERE, SLOW-BLOW FUSE or 2 AMP REGULAR FUSE should be used. It should be installed in the positive ( + ) power line to your unit. ELECTRICAL INTERFERENCE: There will always be electrical interference present from your boat's ignition and charging systems, other electronic equipment, or miscellaneous electrical devices such as bilge pumps, bilge blowers, or automatic pilot. Without reasonable proper precautions, this interference may cause random, false, and inaccurate depth readings on your Aqua Probe digital depth instrument. This interference can "contaminate" the depth finder in several ways. The most common source of contamination is power line interference. To avoid this, it is best to provide separate power wiring for the depthfinder, (or any electronic accessories for that matter) directly from the battery to the operating console. This may already be installed for instruments of similar types. Refer to your boat owners manual. Do not use the "accessory" terminal of the ignition switch. Be sure that the power line is of adequate size (see the chart on page 7) to conduct the necessary amount of power, and is routed through the boat in such a way that it is kept apart from ignition, charging, or other circuits. 6

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