5-20 DATASONICSVolume I System Manual June 1998ArcingCheck the connector on the connector pigtail of the transducer array for signsof arcing. A black carbon material or voids in the rubber are signs of arcing.If a connector has arced, both the connector and its mating connector shouldbe cleaned thoroughly to remove all carbon and dirt. If the rubber hassignificantly eroded, replace the connector. Inspect the mating connector andreplace it also if it shows the same symptoms.Tap TestConnect an oscilloscope to the pins of the transducer array’s connector.Refer to Section 6, "Drawings," for the wiring diagrams. Tap the face of thetransducer array with a screw driver handle or other smooth, light object andnote the waveform on the oscilloscope. The peak voltage level should be inthe hundreds of millivolts.Short Circuit TestDisconnect the transducer array cable from the electronics housing and cleanthe connector. Using a megometer or a digital multimeter on the highest ohmscale, measure the resistance of each pin of the connector to every other pin.All measurements should read greater than 10 megohms; however, a valueas low as 1 megohm will allow the system to work temporarily as the shortcircuit is still developing.Transmit TestTransmit into the transducer arrays. Listen for voltage arcing or hissing whichindicates a faulty transducer element. It also should be possible to feel thetransmit pulse with the hand; however, it may be faint or strong depending onthe amount of pressure and part of the hand that is applied.Heading Sensor CalibrationIf it is determined that the tow vehicle heading does not appear to correlatewell with the ship’s heading, the heading sensor may require calibration. Withthe tow vehicle deployed and underway, the calibration can be performed byusing Windows HyperTerminal in the Accessories program group. Performthe procedure listed below to calibrate the heading sensor. Press Enter aftertyping each command.
