Air780EPM——Hezhuo’s low-power4G-Cat.1module launched in 2025,one of the main models,features 4MB of RAM, supports LCD, camera, Modbus, Ethernet, and CAN; it has more powerful secondary development resources, improved peripheral capabilities, and is more suitable for industrial scenarios. Recently, an engineer friend asked:What is the ADC accuracy of the Air780EPM? They want to save an external ADC… … Read more
A few days ago, I went to help a friend fix a circuit, only to realize I had forgotten my multimeter at home. My friend looked at me eagerly, his face saying, “Master, please show your skills.” I slapped my forehead and remembered a trick my mentor taught me years ago—using my tongue to measure … Read more
1. Experimental Task Task: Based on the STEP-MAX10M08 core board and STEP BaseBoard V4.0 baseboard, complete a simple voltmeter design and observe the debugging results. Requirements: Measure the adjustable potentiometer output voltage through the serial ADC chip ADC and display the voltage information on the core board’s digital tube. Analysis: Drive the serial ADC chip … Read more
Source: Electrician Home Electrical Technicians Technical Club：200037175 Electrical Personnel Procurement Alliance Group:436576602 Application Format:City Name – Company Name (Electrical Engineer Job Title) Before starting the second part of voltage testing, let’s insert a small section A: How to choose the multimeter probe socket under different ranges First, let’s take a look at the sockets available … Read more
The automotive generator is the main power source of a vehicle, functioning to supply power to all electrical devices (excluding the starter) while charging the battery during normal engine operation. The purpose of testing the current and voltage of the automotive generator is to assess the charging rate of the generator, which is related to … Read more
1. Correct Use of the Multimeter Correct use of the multimeter requires familiarity with the dial. Adjust the two zero position adjusters gently. Choose the right terminal, and plug the red and black probes into the correct holes. Rotate the switch to the correct range. Choose the appropriate range for accurate measurements. Look closely at … Read more
A multimeter is a common electrical measuring instrument. In addition to its common uses, there are some lesser-known applications. Here is a complete summary of these uses: 01 Determine if a Circuit or Device is Live The multimeter can be used to determine if a circuit or device is live. By selecting the appropriate measurement … Read more
【Four Techniques to Efficiently Use a Digital Multimeter】 1. Determine if a Circuit or Device is Live The AC voltage range of a digital multimeter is very sensitive; it can display even small induced voltages. Based on this feature, it can be used as a test pencil. The method is as follows: set the multimeter … Read more
Common Electrical Measurement Tools and Their Usage This article introduces the usage methods and precautions for several commonly used electrical measurement instruments, including multimeters, ohmmeters, voltmeters, ammeters, and resistance measuring devices. 1. Briefly describe the method for testing non-marked diodes with a multimeter.Answer: Select the appropriate range; calibrate to zero; measure the forward and reverse … Read more
This article mainly introduces the design principles of digital multimeters and the calculation methods for average value and true RMS value, explaining the defects of the average value calculation method and the calculation method for true RMS value of AC signals superimposed with DC signals. It emphasizes the necessity of using multimeters with true RMS … Read more