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XMD-Ⅲ P-type temperature detection apparatus indication of tolerance and elimination of the reasons for case

Second,stivali ugg, the failure phenomenon of second-class standard thermometer we use the constant temperature oil bath in the standard of supervision of the detection instrument, the instrument function of equipment under normal conditions there is indication that the phenomenon of tolerance in Table 1 is a set of test results, from which can be found There is about 1.40 ~ C instrument measurement error, and is beyond the permissible error in Table 1 instrument unit: foc 0l234567 standard value measurement channel number l2020 l21. , 45l2】 50l21.55l2l70l21.60l2160l21.70l21.60 channel number 8910lll2l3l4l5 measurements l21.75l2l55l2l60l21. , 45l2l70l21.75l2l75l21.70 Table 2 subjects Point (℃) a 500l50l00j150200l250 resistance (n) l803l100.00I119.40138.50l157.3317586f194.10 display (℃) a 49.950 groan l49.9599.95l149.95200. O0i250. O0 banana on the amount of three, resulting in equipment malfunction indication error is measured by the sensor error and display instrument to determine the measurement error, so the instrument over the causes of poor indication is usually displayed by the sensor is damaged or not the instrument measurement error qualified and the interference caused. Here we analyze cause of the malfunction by the following steps. 1. Sensor is not damaged if the sensor has been damaged, with its different degrees of damage arising from measurement errors of different sizes, which measure the consistency of the data is poor. Calculated by analysis of Table 1 shows that, although the instrument indication of tolerance, but the measurements between the maximum and minimum deviations only exist 03qC,ugg milano, the consistency of measurement data very well. Therefore, this failure can be judged not by the sensor caused. 2 power supply or other electrical signals in order to verify the existence of interference or other signal interference power, we charge the UPS power supply to the instrument, while the standard off the AC 220V power heated fuel tank and fuel tank again after a good grounding test the instrument. Found that the above fault is still present on the second, it ruled out the power supply or other electrical signal r interference may affect the instrument. 3. Shows these two aspects by instrument failure analysis and inspection, we can be sure the problem occurred in the display on the instrument, this instrument can be the first examination showed that the measurement error is qualified to use ZX54-type 0.0l class standard resistance boxes, according to equipment manual calibration method available, the use of special calibration instrument configuration cable channels were calibrated to its 0, calibration data in Table 2. From the calibration data analysis, if there is no instrument problems, but if we check the results of the comprehensive analysis will come to this conclusion: single-channel measurement data when measuring compliance, multi-channel measurement data when measuring ultra-poor, that exists between the various channels influence each other. In order to verify this conclusion is correct, the instrument is connected to the standard 0-channel resistance box, the other channel connecting the sensor to test cases, we found that at this time when the 100.00n standard resistance value of the displayed value is not 0 channel 0. OO ℃,ugg boots günstig, but the display 1.45qC. This confirms the conclusions are correct. Known works from the instrument conversion between the various channels by multiplexing circuit to complete, so you can determine the failure occurs in a multiplexer circuit board of the multi-instrument conversion circuit mainly by the four model CD4067 analog conversion chip multi-formed, apparently is due to instrument failure multiplexer chip failure leaving the mutual interference between channels arising. Fourth, troubleshooting multiplexing chip failure due to power failure or damage caused by road conversion chip, it can be, respectively, from the power conversion chip and two multi-site troubleshooting and maintenance. First turn off the instrument power switch, turn on the instrument chassis. Then put the instrument is, turn the instrument power,ugg stivali, the 20V DC voltage with a multimeter measuring the power block power supply voltage of the board, if the measured voltage value and the nominal value does not match, then the instrument power circuit has failed. Repair or replace the power supply should be adjusted to show the value after the test board. If the power supply voltage is normal, then the multiplexer chip has been damaged. Repair or replacement should be adjusted multiplexer board for indication and then test. This machine is in normal power supply voltage measurements taken after the replacement of multi-methods converting circuit board repair of equipment were repaired again after the indication of the test instrument, the results show the instrument error of qualified, the consistency of measurement data for each channel also very good, instruments returned to normal. On Ken Jin

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