Precision bridge isolation amplifier circuit composed of ISO100

The precision bridge isolation amplifier circuit composed of ISO100 is mainly used in weighing and pressure measurement systems. ISO100 is a small and inexpensive optical isolation amplifier circuit, which is excited by LED light, and the photoelectric receiver tube receives and transmits. The picture shows the application of ISO100 in the precision bridge isolation main amplifier circuit. The bridge outputs a unipolar signal of 0～-l0mV, which is amplified by 100 times by the INA101 high-precision instrument amplifier, and then sent to the unipolar input end of ISO100 through a 100kΩ resistor Rl. In order to ensure the linear operation of ISO100, the instrument amplifier of INA101 The output must be lower than the negative value of -2mV. Because ISO100 is in a unipolar amplification state, its internal constant current source is useless for the amplified signal. Here, the output of pin ⑧ is grounded, and pin 16 is composed of I/U through the precision operational amplifier OPA177. The conversion circuit provides a voltage reference of 1V at the output pin 6 to supply power to the bridge. Since RF is 1MΩ, the magnification of ISO100 is 10, and the magnification of the total circuit is 1000. This circuit weighs and measures the pressure system is very useful.



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