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Library's collection Library's IT development CancelTo improve stability and precision in the process of industry production which
use transmitter to convert physical parameters to electrical parameters, we need the
smart transmitter. Because of that, the making of the smart digitizing signal
conditioner (transmitter) with 68HC11 microcontroller is used to improve performance
of sensor, its linearity and error.
The AD7714 is a signal conditioner ADC that produced by Analog Devices
which commonly-used in the manufactured of the transmitter. Transducer can be
connected directly to iis analog input without amplifier components addition anymore,
because it has programmable gain amplifier (PGA) on-chip. And then, it has digital
filter with its frequency cut-off can be programmed and also has a number of
calibration options if needed. In the DAC's part, is using the AD421 by Analog
Devices that has its conversion output in loop-powered 4 -20 mA current, which
compatible with all of universal controller in the industry standard.
The AD7714 and AD421 are controlled by rmCTocontroller/microprocessor with
serial asynchronuous interfacing that configured by only three-wire operation. Each IC
can be known by their chip select
By using this smart transmitter, we can decrease and minimize error, fix the
linearization and precision of sensor that used in the process and operation of the
industiy production. Because the smart digitizing transmitter with microcontroller
based system has capability to fix the linearity characteristic of nonlinear sensor
(especially thermocouple), capable to compensate error that caused by ambient
temperature effect, capable to self diagnostic and self calibration to minimize error that
caused by system and capable to check burn out to anticipate performance of sensor
(thermocouple) that used in this transmitter.