description: As a conventional electronic device, the load plays an important role in the testing process of various electronic products. The performance of the load directly affects the accuracy and accuracy of the test results. In order to obtain the desired test results, a load with accurate resistance and excellent performance is necessary. Conventional resistive loads (sliding rheostats and resistor boxes) can cause changes in resistance due to changes in their temperature. Thermal noise generated when the current is large and sudden rise in temperature often affect the test results. For example, when performing parameter detection on some high-precision regulated power supplies, power devices, batteries, etc., the performance of the load will affect the inaccuracy of the parameter values. The attached circuit is a design circuit diagram. See the PDF document for details! Type of optical cable 4X10G To 40G Cable,40G Aoc Cable,4X10G To 40G Cable For Sale,Qsfp-4X10G-Aoc5M 40G Aoc Cable Nanjing Jisu Shitong Technology Co., Ltd , https://www.netairs.com
Electronic Load Schematic To measure the performance of a linear regulated power supply, we designed an intelligent, digital electronic load that is different from a conventional fixed resistor or variable resistor, but uses a power constant current circuit to implement the load. Features. Its principle block diagram is shown in Figure 1.
In Figure 1, the MCU is the core of the whole circuit. The MCU controls the operating current of the power constant current source through the D/A conversion circuit, and the analog-to-digital conversion part detects the voltage and current values ​​on the power constant current source, which serves as the basis for further adjustment of the MCU. In order to enable the device to be shared as an independent measurement unit for other upper devices, an optically isolated serial communication interface has been added. 
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