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多傳感器檢測系統信號處理研究外文翻譯-其他專業.doc

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多傳感器檢測系統信號處理研究外文翻譯-其他專業.doc

外 文 翻 譯 畢業設計題目 多傳感器檢測系統信號處理研究 原文1 911plus CTD SYSTEM OPERATING AND REPAIR MANUAL 5-1 譯文1 911plus CTD系統的操作和維修手冊 5-1 原文2 911plus CTD SYSTEM OPERATING AND REPAIR MANUAL 5-2 譯文2911plus CTD系統的操作和維修手冊 5-2 1-3 TROUBLE DIAGNOSIS AND REPAIR UNDERWATER UNIT PROBLEMS 原文1 LIFE-THREATENING HIGH VOLTAGES ARE PRESENT IN BOTH DECK UNIT AND UNDERWATER UNIT WHEN POWER IS ON. THESE HAZARDOUS VOLTAGES PERSIST FOR UP TO ONE MINUTE AFTER REMOVAL OF POWER.. THE BEST WAY TO PROTECT AGAINST ELECTRICAL SHOCK IS TO DISCONNECT THE AC POWER CORDS FROM THE REAR PANEL OF THE DECK UNIT, THEN WAIT A FULL MINUTE BEFORE ATTEMPTING SERVICE. ALWAYS DISCONNECT THE AC POWER CORD BEFORE CHECKING FUSES For protection of the circuitry, we also recommend that AC power be removed and a 1 minute period for supply capacitor discharge be allowed before opening housings, changing connections, removing or inserting circuit cards, or otherwise working on the equipment. If the data telemetry is OK deck unit data light is on and error light off but one or more channels is faulty, see Section 5-2 Sensor Problems before proceeding with work on the underwater unit; the problem may be a defective sensor. Read Section 4-1 which describes the operation of the underwater unit circuitry. Refer also to the section titled schematics which contains the underwater unit schematic diagrams. All voltages are measured relative to pin 2 of any plug-in card; this is main signal/power ground for the underwater unit. 5-1.1 UNDERWATER UNIT COMPLETELY INOPERATIVE Make sure that the deck unit is supplying the proper sea cable voltage 250 volts. If there is no sea-cable voltage, the seacable rear panel fuse may be blown. With SEARAM units, see that SEARAM is supplying the proper voltage to the CTD 12 - 15 volts. Look for the presence of the telemetry waveform across the sea cable. USE EXTREME CAUTION IN PERFORMING THIS OBSERVATION. THE SEA CABLE VOLTAGE IS POTENTIALLY LIFE-THREATENING ALLOW 1 MINUTE AFTER POWER-DOWN FOR POWER SUPPLY DISCHARGE BEFORE MAKING CONNECTIONS TO THE SEA CABLE OUTPUT CONNECTOR. If the telemetry waveform is present, the trouble is probably in the deck unit. If the telemetry waveform is not present at the deck unit, measure the sea cable current which will be in the range of 50 to 220 milliamperes depending on the underwater unit configuration. If the sea cable voltage is present, but no current is being drawn by the underwater unit, there is either a break in the sea cable, or an open circuit in the cable interface circuitry inside the underwater unit. Assuming that there is no break in the sea cable, turn off the deck unit power, refer to Section 6-1 and open the Underwater Unit housing, but leave the electronics chassis connected to the top end cap. Restore deck unit power and measure the internal supply voltages relative to pin 2 5, 15 and -15 at pins 1, 5, and 3 respectively of the Analog interface boards. If there is no voltage at any point on the backplane, the sea cable interface circuitry is either defective or is not receiving power from the sea cable. Check that the Sea-cable Interface is receiving the correct input voltage 250 volts. If no voltage is present at the inputs to the DC/DC converters, the series pass transistor Q1 on the sea-cable interface board may be open. If the 5, 8, 15, or -15 volt levels are absent or in error by more than about 0.5 volts, remove all the underwater unit plug in printed circuit boards. Check the power supply levels again - if these are now ok, the problem is probably in one of the plug-in boards. Start plugging boards in, beginning with the Transmitter top board. Turn off power and wait one minute for supply discharge before plugging in each board. If a board is found which appears to cause the drop in supply voltage, refer to the circuit description in Section 4-1 and the boards schematic diagram. Check the board for dead shorts at the power input pins -an IC or one of the power supply bypass capacitors may be shorted. Also, carefully examine the board for any metallic material solder, wire clippings, shavings which may have inadvertently shorted the printed circuit traces or component pins. With the board in the underwater unit chassis, look at the board outputs and inputs for signal irregularities. The logic levels are 5 volt CMOS and should swing the full 0 to 5 volts. If the power supply levels are not ok with the plug-in boards removed, check the backplane wiring for broken connections or wires, and for any shorted connections. Check that the input voltage to the DC/DC converters is correct. If so, one of the converters may be defective, or one of the by-pass capacitors across the converter outputs may be shorted. 5-1.2 POWER SUPPLIES OK BUT NO DATA Check Logic Board pin 3 for the NRZ logic level. If this signal is present, check phase-reversing output at Transmitter Board pin 8. If the phase-encoded signal is present at the Transmitter Board output, the problem is in the transformer coupling to the sea-cable, or in the sea-cable wiring itself. If the phase-encoded signal is missing or wrong in frequency or waveform, check for proper output signals from the Logic 1 Board. The following should be observed Pin 5 FR 27,648 kHz square wave Pin 4 FR/4 6,912 kHz square wave Pin H 69120 Hz square wave Pin 6 8640 square wave If the signals described above are ok on the Logic Board alone, reinstall the remaining circuit boards one-by-one, checking the suspect signal after each card is installed until the faulty card is located. 5-1.3 ONE OR MORE NON-FUNCTIONING CHANNELS If a frequency channel is giving improper readings, check that the sensor signal is present on AP counter board pins 7 and H on the backplane, found on the right edge of the small board that the coax cabling is mounted to. These are 2 volt p-p sine waves in the frequency range of 2800 - 12000 Hz for temperature and conductivity and a 4 volt square wave in the range 35000 to 40000 Hz for the pressure sensor. If one of the sensor outputs is faulty, remove that channels AP Counter Board - if this restores the signal, the AP Board has a defective input. Try one of the other AP Counters the five boards are identical in the offending channel position. If the AP Counter inputs are ok, try swapping AP Counter Boards to locate the faulty one. If the problem stays with the same channel, check that the FR, SE, SC, and RESET, inputs are active. If the problem is a faulty A/D channel, check that the inputs to the A/D Board multiplexer pins D, F, H, J, L, 10, 8, 7 are as assumed. Check for 15 and -15 volts at the A/D Board. Look for the SE scan clock at pin 9; this starts the rapid 50 μs/channel acquisition of A/D channel data. Check that the SC shift clock is present at pin 6, and that serial data is present at pin 4. 5-1.4 PUMP NOT WORKING CTDs shipped after 1 January 1990 have a hard-wired pump delay to facilitate pump priming. With this feature, the pump turn-on is enabled only after two conditions are met. First, the conductivity cell must be filled with seawater which causes the conductivity frequency to rise above the 0 conductivity frequency. Second, when the CTD senses the proper increase in frequency, it starts a 60 second delay timer. This delay allows sufficient time for the air in the tubing to escape through the air bleed-hole. Be sure to hold the pump just under the surface with the top of the tubing underwater for at least a full minute before beginning the profile. Note The control logic for this feature only functions on the Primary conductivity channel. If the CTD is equipped with redundant T C sensors and pumps, and you wish to deploy it with the Primary conductivity sensor removed, be sure to swap the Secondary T C sensor pair to the Primary T C channel bulkhead connectors. Note with old water sampler systems that interrupt CTD power when tripping a bottle, wait 60 seconds after bottle firing for the pump to restart it is not necessary to wait when using the Sea-Bird subcarrier modem / rosette interface system. Make sure that the pump cable is not cut or otherwise damaged and that the rubber molded plug is fully mated to the pump housing connector. Unplug the pump from its external cable. Apply 12 volts to the pump housings small connector pin, return to the large pin. Look for a current drain of about 300 milliamperes and listen for the pump running. If the pump passes this test, the problem is in the main housing or in the cabling. Disassemble the underwater unit and perform the following tests. Unplug the conductivity sensor. Connect a audio signal generator approximately 2 volts p-p output at pin 7 return to pin H of the AP Counter Board for primary conductivity C1. Set the generator frequency to about 2500 Hz. Observe the squared signal at U2A output. Measure the voltage at pin L which should be zero. Increase the generator frequency to about 4000 Hz. The voltage at pin L should now be 5 volts. If not, the one-shot U3B or the buffer U2B is defective. If the voltage at C1 AP Counter Board pin L responds properly, make sure that it also appears at the Transmitter Board pin K. 60 seconds after Transmitter Board pin K goes high, pin L should also go high to nearly 15 volts. If this is the case, the problem is in the wiring to the pump external connector. 作者SEA-BIRD電子股份有限公司 國籍美國 出處SEA-BIRD電子股份有限公司 SENSOR PROBLEMS (原文2)Apparent sensor problems may be the result of trouble with the cables or the acquisition circuitry in the underwater unit, or the trouble may be nothing more than an incorrect entry of the sensor calibration coefficients. The conductivity and temperature sensors have identical power and output characteristics, and may be freely interchanged to help localize the fault. Although repair of these sensors is certainly possible, it is not likely that repairs can be made without affecting the sensors calibration. The Sea-Bird sensors are small and easily replaced in the field; as they are supplied with calibration coefficients, a spare sensor can get a failed unit into fully operating and calibrated condition with a minimum of trouble. Sea-Bird is also always ready to send replacement sensors by air courier immediately upon notification of a failure. 5-2.1 CONDUCTIVITY AND TEMPERATURE SENSORS If a sensor is generating conductivity, temperature, or pressure-dependent frequency but the indicated value is significantly erroneous, check that the coefficients used in the processing software are as stated on the calibration certificates supplied with the sensor. CAUTION - The environment inside the sensor housing was completely desiccated and backfilled with pure argon prior to factory calibration. Opening the housing will introduce humidity atmospheric water vapor which will cause an immediate offset to the calibration and temporary drift instability. Swap the cable connections to the temperature and conductivity sensors to verify the operation of the acquisition circuit SEASOFT permits the reversal of the channel assignments to permit the proper display of temperature or conductivity when this is done - use the SEACON program to do this. If no frequency indication occurs with the sensors swapped, disconnect the rubber molded plug from the sensor connector. 15 volts should be measured between the large pin and one of the small pins if the large pin is up when looking into the plug, the 15 should be found on the left side small pin. The proper functioning of a frequency channel may be confirmed by connecting a frequency source square or sine wave, 2 - 5 volts p-p to right side small pin as defined above and the large ground pin of the sensor cable. The deck unit should read the frequency of the generator. The sensors may also be checked separately from the CTD by connecting a power source of 10 to 20 volts and observing the frequency output with an oscilloscope. Application Note No. 3 in the app notes section of this document explains temperature/ conductivity sensor disassembly instructions. Look for broken leads or evidence of water leakage. 5-2.2 PRESSURE SENSOR Internal pressure sensors are mounted inside foam insulation near the bottom of the card file. The red lead should be at 8 volts, the black lead at power common. The blue lead should be connected to Backplane via the small board that the sensor cabling is secured to. A properly operating sensor will exhibit a square wave frequency in the range 32 to 40 kHz at this point. For a discussion of possible fault conditions associated with this and subsequent acquisition circuitry, see Section 5-1.3 above. It is not possible to perform field repairs on a defective pressure sensor; any repair work must be done at the factory. The temperature compensation of the pressure makes use of a solid-state bandgap temperature sensor embedded in the pressure sensor. This element Analog Devices type AD590 is a 2-terminal device which generates a current proportional to absolute temperature 1 microampere per K. The current is input to an op amp on the Modulo 12P board; a current of opposite polarity is derived from the REF02 / Op215 reference and used as an offset source. The current difference is scaled through the 95K ohm precision fixed resistor R19 to create an input to the 12 bit A/D converter, U8. The A/D converter parallel output is strobed into the CD4021 shift registers in preparation for transmission to the deck unit. The white lead from the pressure sensor goes to -15 volts. The orange lead connects to pin 10 of the Modulo 12P board. Disconnect this lead and connect through a microammeter to power common. If the sensor is working correctly, the current should be approximately equal in microamperes to the ambient temperature in K. If the temperature sensor appears to be ok, check the voltage levels associated with Modulo 12P board U3. 5-2.3The dissolved oxygen sensor The dissolved oxygen sensor should show a sensor current channel output of approximately 5 volts when the system is powered up. This saturation condition will continue for up to a minute or two, after which the output will steadily decline until a stable reading typically 2 volts representative of atmospheric oxygen level is maintained. If the oxygen current channel voltage is zero upon power up, the sensor is defective. This condition can be caused by the sensor module proper the small brown plasti

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