RELIANCE 57421 脉冲测速仪
压力信号出现满量程情况，与实际不符。断开卡件后面的信号线正极，信号由满量程变仍有8公斤左右压力信号（量程为0-13公斤）。经现场观察，该测点经过安全栅。将信号线短路，不过安全栅后，信号显示正常。0-52712 800756-21B 初步判断是安全栅出现问题。原因可能是同一组的信号，安全栅是共地的。当安全栅故障后，另一毫安信号耦合到该信号上来，造成信号的干扰。 Q14：热电阻信号不准如何排查？ A：首先，检查热电阻的组态，确认了组态中的热电阻型号和实际的型号保持一致；其次，确保上下位机组态一致。最后，如果还是怀疑测温有问题的话，可以测量现场热电阻A和B之间的阻值为R1；B和C之间的阻值为R2。 根据3线制热电阻的测温原理，可以得到热电阻的实际电阻值为R1-2R2。然后查表找出对应的温度。然后用这个温度和监控上的温度再进行比较。
硬件如主板或硬盘出现故障。0-52712 800756-21B若硬盘空间不够，也可能自动退出。 Q11：0-52712 800756-21B计算机重启后异常？ A：用户现场使用DELL液晶显示器，操作系统为WIN NT。某次重启操作系统后，无法正常进入桌面，提示不支持vga格式。与维护人员交流，在重启计算机前做过何种操作，反馈为提高了显示器的分辨率。判断可能是调高了分辨率后导致NT系统自检时无法识别显示系统。进入BIOS，恢复系统默认设置后系统恢复正常。0-52712 800756-21B操作员键盘为何会引起死机？ A：原因分析：键盘外壳未良好接地，人体静电对键盘的冲击，也会导致键盘死机。 解决方案： 1、新键盘外壳生产时，要求外协单位在键盘上留出接地孔或接地杆； 2、安装时，使键盘外壳与键盘线屏蔽地可靠连接； 3、键盘外壳上去除部分涂层，使外壳有有效接地点。 Q13：压力信号异常是何原因？
How to troubleshoot inaccurate thermistor signals? A: Firstly, check the configuration of the thermal resistor and confirm that the thermal resistor model in the configuration is consistent with the actual model; Secondly, ensure that the configuration of the upper and lower computers is consistent. Finally, if there is still suspicion of temperature measurement issues, the resistance value between the on-site thermal resistance A and B can be measured as R1; The resistance value between B and C is R2. According to the temperature measurement principle of a 3-wire thermistor, the actual resistance value of the thermistor can be obtained as R1-2R2. Then look up the table to find the corresponding temperature. Then compare this temperature with the temperature monitored on the monitor. If there is a significant discrepancy, please replace the card and try again. Q15: How to quickly troubleshoot system communication faults?
Solution: 1. When producing a new keyboard casing, outsourcing units are required to leave a grounding hole or grounding rod on the keyboard; 2. During installation, ensure that the keyboard casing is reliably connected to the shielded ground of the keyboard cable; 3. Remove some coating from the keyboard casing to provide an effective grounding point. Q13: What is the reason for abnormal pressure signal? A: The pressure signal shows a full range situation, which does not match the actual situation. Disconnect the positive pole of the signal wire behind the card, and the signal will change from full range to still have a pressure signal of about 8 kilograms (with a range of 0-13 kilograms). After on-site observation, the measuring point passed through a safety barrier. Short circuit the signal line, but after passing the safety barrier, the signal display is normal. The preliminary judgment is that there is a problem with the safety barrier. The reason may be that the same group of signals have safety barriers that are grounded together. When the safety barrier fails, another milliampere signal is coupled to the signal, causing interference to the signal.
Hardware such as motherboard or hard drive malfunction. 5. If there is not enough hard disk space, it may also exit automatically. Q11: Is there an abnormality after restarting the computer? A: The user uses a DELL LCD display on site and the operating system is WIN NT. After a certain restart of the operating system, it was unable to enter the desktop normally, indicating that the vga format is not supported. Communicate with maintenance personnel on what actions were taken before restarting the computer, and provide feedback on improving the resolution of the monitor. It is possible that increasing the resolution may have caused the NT system to fail to recognize the display system during self check. After entering the BIOS and restoring the system's default settings, the system returns to normal. Q12: Why does the operator keyboard cause a crash? A: Cause analysis: The keyboard casing is not properly grounded, and the impact of human static electricity on the keyboard can also cause the keyboard to crash.