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检定配热电偶用动圈式温度指示、指示位式调节仪表,除用JJG187-78检定规程中规定的标准仪器及配套设备外,另加一个数字面板表配合运用,可带来极大方便。检定时按下图进行接线。图中,调压箱1、电阻箱2及配套使用的直流低阻电位差计3均应符合规程的要求。数字面板表5可采用3 1/2位或4位数码显示。即显示O～199.9mV或0～99.99 mV。该表可以自制。如3 1/2位数字面板表,其核心3 1/2位A/D转换器——14433,只要配以少量的电子元件及译码器14511,驱动器1413,低电压基准管1403和发光数码管即可。在此不再详述。由于采用的数字面板表其输入阻抗均在
Test with thermocouple with moving coil temperature indicator, indicating the position adjustment instrument, with the JJG187-78 test procedures specified in the standard equipment and ancillary equipment, plus a digital panel with the use of table can bring great convenience. Check the wiring according to the figure below. In the picture, the voltage regulator box 1, the resistance box 2 and the supporting DC resistance low resistance potentiometer 3 should meet the requirements of the regulations. Digital Panel Table 5 can be 3 1/2 digit or 4 digit display. The display shows O ~ 199.9mV or 0 ~ 99.99mV. The table can be homemade. Such as a 3 1/2 digit digital panel meter with its core 3 1/2 digit A / D converter - 14433, as long as a small number of electronic components and decoder 14511, a driver 1413, a low voltage reference tube 1403, Tube can be. This will not be detailed here. Due to the use of digital panel meter input impedance are