The input/output analog signal isolation amplifier (also known as analog isolation transmitter) between industrial field sensors and PLC/FCS/DCS and instrumentation belongs to the category of analog signal conditioning. Analog signal isolation amplifier can effectively protect all levels of control loop, eliminate or reduce the impact of environmental noise on the test circuit, inhibit the interference of common ground, frequency converter, electromagnetic valve and surge pulse on the equipment, and at the same time have signal limiting pressure on the lower-level equipment. Turbulence function. It is a reliable protection device for transmitter, instrumentation, frequency converter, solenoid valve, PLC/DCS input and output, and communication interface. For some harsh industrial sites, the control system is intricate and the high temperature, vibration, humidity, and interference signals coexist. Therefore, the input and output analog signals are amplified, converted, remotely transmitted, and the system circuits are completely isolated by the isolation amplifier. It is indeed the current automation control. One of the effective measures against interference in the system. Bandwidth, also known as bandwidth, refers to the amount of data that can be transmitted at a fixed time, that is, the ability to transmit data in the transmission pipeline. In digital devices, the bandwidth is usually expressed in bps, which is the number of bits per second that can be transmitted. In analog equipment instruments, the bandwidth is usually expressed in cycles per second or hertz (Hz). The bandwidth of a signal refers to the frequency range occupied by various different frequency components contained in the signal. The frequency response, referred to as frequency response, is used in electronics to describe the differences in the processing capabilities of a single instrument, PLC, and other devices for different frequency signals. Like distortion, this is also a very important parameter indicator. The test method of the bandwidth index is as follows. Add an adjustable frequency sine wave analog signal at the input, and the output can stably follow the input signal. The maximum frequency range is the bandwidth. What is the engineering significance of the bandwidth indicator for industrial signal isolation amplifiers? How do we understand "bandwidth" in the application? The bandwidth indicator reflects the response speed of the isolation amplifier to changes in the input signal. The larger the bandwidth, the faster the isolation amplifier responds to signal changes; the smaller the bandwidth, the less sensitive the isolation amplifier reacts to the instantaneous change of the input signal, and in some cases it means that the anti-dry capability is stronger. The working principle of the isolation amplifier and isolated transmitter is to first send the standard signals sent and received by sensors, instruments, PLCs, etc., or special signals such as temperature, displacement, frequency, and rotation speed to the semiconductor device to modulate, and then the sense of light or magnetic induction. The device performs isolated conversion and transmission, and then demodulates and restores the original signal with the same precision and linearity or converts it into other signals. At the same time, the isolated and processed signals are isolated to ensure signal input, signal output, and auxiliary power supply. That is, the isolation between the signal, power supply, and ground before and after the conversion. Analog signal isolation amplifiers and isolation transmitters are a device in the category of industrial instrumentation and sensors. Their main function is analog isolation, amplification, conversion, and transmission. Therefore, the signal bandwidth and frequency response are bound to be the basic Technical indicators. Industrial site signal transmission interference treatment reference program (inverter anti EMC interference dedicated isolation amplifier): The industrial site has frequency conversion control equipment, high-power electromagnetic starting equipment, GPS high-frequency signal wireless transceivers and other systems that have EMC interference sources. It is necessary to analyze and determine the interference signal processing solutions based on the characteristics of different interference sources and system control signals. 1, the sensor output analog signal interference The installation of ISO series analog signal isolation amplifier at the output of the sensor can effectively solve the attenuation and EMC interference during the transmission of analog signals and enhance the stability and reliability of the display control system. Analog signal isolation amplifier used for inverter EMC interference: ISOEMU-POM series is equipped with input signal interference suppression filter circuit and output interference harmonic absorption circuit inside the IC to enhance EMC immunity and high-frequency signal space interference . It is especially suitable for occasions where frequency conversion control equipment, high-power electromagnetic starting, GPS high-frequency signal wireless transceiver devices are on site. 2, spatial interference of high frequency signal radiation Each control system and equipment shall be respectively equipped with metal shield boxes (different metal components used in different frequency bands) and the housing shall be reliably grounded. The signal transmission transmission lines shall be shielded with twisted pair cables. 3, RS232/RS485 remote communication line interference The DC-DC isolation module power supply is installed on the RS232/RS485 communication interface, and the communication power supply is directly isolated from other power supplies. Twisted-pair shielded cables (shield ground) are also used for signal communication transmission lines. 4. Interference in system power supply power circuit There are high-current thyristors, frequency conversion control equipment, and high-power electromagnetic starters on site, which will have a distorting effect on the power supply system's power supply parameters. Through the power circuit, interference signals will enter the various control devices on site. Therefore, first of all, make sure that each device on the site is well grounded, and the power supply of each device should be equipped with its matched power supply filter (low-pass EMI filter or suppressing reactor). Analog Signal Isolation Amplifier Bandwidth and Frequency Response of Isolated Transmitters Industrial Field Specifications Selection Application Reference: 1. When the analog signal is in slow frequency (<50Hz) (such as measuring temperature, pressure, displacement, flow, etc.), an isolation amplifier with small bandwidth and low frequency response can be selected: ISOEMU(A)-POM series (M: Indicates low frequency). So in the frequency changer control system, in order to inhibit and isolate EMC interference, often choose: ISOEMU-POM series isolation amplifier. 2, analog signal in the high frequency of change (> 2KHz) occasions (such as measuring the speed, adjust the high-speed electronic switch, switching power supply PWM control, etc.), in order to ensure the integrity and reliability of the collected data, often used high bandwidth, high and low frequency Isolation Amplifiers: ISOEMU(A)-POH Series Products (H: indicates high frequency). 3. Most systems other than high-frequency and low-frequency ringing environments use conventional frequency response (2K) products: ISOEMA-PO or ISOEMU-PO series. 4. For the field environment with strong magnetic interference (high-frequency electromagnetic high-current load) occasions Opto-isolated amplifiers can be used: ISOU(A)-POM series. 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