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Eja smart instruments refer to new types of instruments that contain microprocessors. It combines computer technology and measurement and control technology, and possesses certain human-like intelligent features, such as data storage and processing, logical reasoning, self-checking, self-correction, flexible response, fault detection, and life expectancy prediction. Typical functions include: a self-diagnosis function for hardware faults. The self-diagnosis function refers to the use of pre-programmed testing procedures to automatically inspect the main components of the instrument and locate any faults. There are three types of self-check methods: power-on self-check, periodic self-check, and keyboard self-check. Automatic measurement function: Intelligent instruments typically possess automatic adjustment features such as nonlinear correction, automatic zero-point adjustment, automatic range conversion, and automatic trigger level adjustment. Eja smart instruments are capable of processing data: thanks to microcontroller devices and single-chip microcomputers, they offer greater flexibility in handling signals and data compared to traditional logic hardware. Many tasks that traditional logic hardware cannot accomplish can be solved flexibly through smart instruments under software control. Automated control methods: The entire system is operated and controlled by microcontrollers or microprocessor-based devices. Tasks such as range selection and switch control, data collection and scanning, as well as data processing, transmission, printing, and display can all be automated using intelligent instruments. Real-time adjustment and modification of parameters: With the development of various field-programmable devices and online programming techniques, it is possible to set and dynamically modify these parameters in real time at the site where the instrument is used. The online dynamic modification of parameters and the flexibility of structural design ensure that, without changing the hardware of the equipment, the entire instrumentation system can be continuously upgraded and updated through updates to the system software. The eja transmitter, a multi-functional transmitter, features a universal power input interface; it is a product with such a power interface, ensuring that the power supplied is suitable for this series of products in order to prevent damage to them. When the power quality is poor, it is recommended to install surge suppressors in the power supply circuit to protect against lightning strikes, as well as fast pulse train suppressors. The multi-functional transmitter uses a calculation method that involves individual data collection for each measurement channel, ensuring complete symmetry during use; it also features various wiring options. Suitable for different load types. The input voltage should not be higher than the product’s rated input voltage. The standard rated input current is 5A. If other instruments are connected to the CT, a series connection should be used for wiring. Before removing the current input wire of the product, it is necessary to disconnect the primary circuit of the CT or short-circuit its secondary circuit. It is recommended to use a terminal block for easy installation and removal. Ensure that the input voltage and current correspond to each other, with the same sequence and direction. The configuration of the input network for the eja transmitter instrument is determined by the number of CTs in the system; for 2 CTs, the three-phase three-wire two-element configuration is selected, while for 3 CTs, the three-phase four-wire three-element configuration is used. The wiring of the instruments and the input network specified during instrument programming should be consistent with the wiring method of the load being measured; otherwise, it will result in incorrect voltage or power readings by the instruments. In three-phase three-wire systems, the voltage that is measured and displayed is the line voltage; whereas in three-phase four-wire systems, the voltage measured and displayed is the phase voltage of the power grid.