MOBILE COMMUNICATION TERMINAL HAVING DC VOLTAGE METER AND RESISTANCE METER

摘要

The present invention is a DC voltage and resistance, it uses ADC (analogue-to-digital converters), it supports a DC voltage measuring system by modem controller, it is related to the mobile communication terminal for receiving signal and measuring route multiplexer for generating resistance measuring system, transmitting from the probe connector in a DC voltage and resistance measurement path, is used to export any of a measured paths; Multiplexer is connected to the first output end, and the predetermined voltage higher than transient voltage and the overvoltage crowbar for blocking the side of modem are controllers; DC voltage measurement, from voltage source in the first distributor, overvoltage protection circuit is applied and is exported to distribute the analog input voltage for being less than modulation /demodulation controller unit; The distributor of resistance measurement and the second division output voltage is received from multiplexer; Quantized signal is passed to the ADC and the second distributor from the first distributor; DC voltage measurement, for the value of quantization by modulation demodulation controller unit analog voltage ADC and, actual voltage value is calculated for voltage measurement range to the wastewater treatment according to combination voltage, resistance when measured in ADC it be changed into quantized values to modulation demodulation controller unit analog voltage then, processing, it is used to calculate actual resistance, by using the relationship between the voltage of conversion and resistance distribution; The multiplexer controlled by DC voltage measurement and a resistance channel, it is used to select any one path from measurement access, wherein pass through the first frequency divider control of controller, it is used to select a voltage measurement range, depends on according to preferably by the selection of the terminal user of user's selectivity of the terminal manufactured.