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Copyright of Electric Machines & Control / Dianji Yu Kongzhi Xuebao is the property of Electric Machines & Control and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Electric Drive is the property of Electric Drive Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In order to solve the problem that the online detection results of the conductivity sensor in water quality monitoring were widely inaccurate, unstable and unsuitable integration, the high precision conductivity sensor based on ADuCM360 chips was designed. The sensor adopted the method of pulse excitation electrode, which effectively weakened the polarization phenomenon of the conductivity electrode by changing the pulse width and the duty ratio of pulse-width modulation (PWM), the inconvenience of changing the PWM waveform by hardware was avoided, and the sensor debugging was more intelligent. The Pt1000 was used for temperature compensation to improve the detection accuracy of the sensor. The data transmission adopted the strong anti-interference ability ADM2587 as the RS-485 transceiver to realize communication with the host computer. The experiments show that the zero drift is 0.22%, the repeatability error is 0.50%, and the temperature compensation precision is 0.8%. All the parameters meet the requirements of the industry standard. [ABSTRACT FROM AUTHOR]

Copyright of Electric Machines & Control / Dianji Yu Kongzhi Xuebao is the property of Electric Machines & Control and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

V/F is an imporant mode in the applications of photoeleccric detection to converr the voltage signals produced by photoelectric devices to pulse signals. The V/F circuit was designed to aim aa the problems of pulse-width modulation that can match with the digital autocorrelator. This design was based on the principles of monostable trigger and signal conversion requirements when photoeleccric was deterted. This circuit could produce the signal that the pulse held at 30ns that was better than other V/F circuits and the circuit was simple in structure and had high converter-frequency. It also held short convert time and excellent linearity and so on. [ABSTRACT FROM AUTHOR]