APPLICATIAON

Digital Display AC And DC Voltmeter/Ammeter

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Digital DC/AC Voltage/Current Meter

Introduction of the scheme

Digital voltmeter/ammeter can be built with SD8110, 8111, or 8103, and a small amount of peripheral devices. AC signals at 45 to 65 Hz can be measured directly without conversion. Calibration is done by software.

SD8110 supports 4 X 8 LCD or LED drives. Decimal point can be selected through jumper. Alarm output is optional.

SD8111 supports 4 X 14 LCD or LED drives. Decimal point, full scale range, pass code, signal ratio, and alarm output can be selected and set through switches.

SD8103 supports 4 X 20 LCD or LED drives. It can be used to build three phase voltmeter or ammeter. AC or DC measurement, decimal point, full scale range, pass code, signal ratio, alarm output , 485 communication, and current loop output can be selected and set through switches.

● Measure AC or DC voltage or current, AC or DC selected by software

● Over-voltage or over-current alarm, alarm threshold can be set

● Signal ratio, slave address, password, baud rate can be set

● DC reverse connect indicator

● 4-20mA current loop output, RS485 communication

● LCD or LED display

● All functions including the current loop signal calibration and AC/DC signal calibration can be adjusted through software


Application Characteristic

Application block diagram

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