Excitation is an electronic term that refers to the role of the voltage and current input from a power source or signal source to a circuit that pushes the circuit to work. Constant current source and constant pressure source are the two types of excitation that are commonly used in pressure transmitters. There is a difference between the two incentive methods, and their roles are different. The constant current source excitation is conducive to the compensation effect of thermal sensitivity drift. This is because the temperature coefficient of the arm resistor is positive, while the temperature coefficient of sensitivity is negative. The temperature coefficient of the output signal voltage at constant current excitation is the algebraic sum of both. However, the constant pressure excitation of the pressure transmitter does not directly provide sensitivity and temperature compensation. However, when excitation with a constant voltage source, a thermistor or diode can be connected in series outside the bridge to compensate for the thermal sensitivity drift. When excitation with constant current, this sensitivity compensation method does not work. It can be seen that the constant pressure source and the constant current source excitation of the pressure transmitter cannot be interchangeable with each other at will. In addition, the excitation power supply of the pressure transmitter can be divided into proportional excitation and fixed excitation. The former is to connect the pressure transmitter bridge directly to the power supply, and when the power supply changes, the sensitivity and zero point of the pressure transmitter will change accordingly. The latter has a reference voltage inside it, and the pressure transmitter bridge is energized by the reference voltage. The reference voltage is constant and independent of the power supply. The reference voltage remains unchanged as long as the supply voltage varies within a specified voltage range. As a result, the output of the pressure transmitter remains unchanged and is not affected by the supply voltage. If you have any questions about product consultation, product customization, agency, technical inquiry, quotation, etc., please contact Xingyi: 400-600-4496!