RELIANCE 57421 脈沖測速儀
壓力信號出現滿量程情況，與實際不符。斷開卡件后面的信號線正極，信號由滿量程變仍有8公斤左右壓力信號（量程為0-13公斤）。經現場觀察，該測點經過安全柵。將信號線短路，不過安全柵后，信號顯示正常。0-52712 800756-21B 初步判斷是安全柵出現問題。原因可能是同一組的信號，安全柵是共地的。當安全柵故障后，另一毫安信號耦合到該信號上來，造成信號的干擾。 Q14：熱電阻信號不準如何排查？ A：首先，檢查熱電阻的組態(tài)，確認了組態(tài)中的熱電阻型號和實際的型號保持一致；其次，確保上下位機組態(tài)一致。最后，如果還是懷疑測溫有問題的話，可以測量現場熱電阻A和B之間的阻值為R1；B和C之間的阻值為R2。 根據3線制熱電阻的測溫原理，可以得到熱電阻的實際電阻值為R1-2R2。然后查表找出對應的溫度。然后用這個溫度和監(jiān)控上的溫度再進行比較。
硬件如主板或硬盤出現故障。0-52712 800756-21B若硬盤空間不夠，也可能自動退出。 Q11：0-52712 800756-21B計算機重啟后異常？ A：用戶現場使用DELL液晶顯示器，操作系統為WIN NT。某次重啟操作系統后，無法正常進入桌面，提示不支持vga格式。與維護人員交流，在重啟計算機前做過何種操作，反饋為提高了顯示器的分辨率。判斷可能是調高了分辨率后導致NT系統自檢時無法識別顯示系統。進入BIOS，恢復系統默認設置后系統恢復正常。0-52712 800756-21B操作員鍵盤為何會引起死機？ A：原因分析：鍵盤外殼未良好接地，人體靜電對鍵盤的沖擊，也會導致鍵盤死機。 解決方案： 1、新鍵盤外殼生產時，要求外協單位在鍵盤上留出接地孔或接地桿； 2、安裝時，使鍵盤外殼與鍵盤線屏蔽地可靠連接； 3、鍵盤外殼上去除部分涂層，使外殼有有效接地點。 Q13：壓力信號異常是何原因？
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.