Appearance of Multimeter A multimeter is an instrument used to measure parameters such as voltage, current, and resistance. It comes in two types: analog and digital, as shown in Figure 1. Figure 1 Multimeter Preparation Before Using the Multimeter (1) Place it horizontally. Position the multimeter horizontally. (2) Check the needle. Check if the multimeter … 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
The multimeter, also known as a multifunction meter, three-in-one meter, or universal meter, is a versatile and multi-range measuring instrument. Generally, a multimeter can measure direct current, direct voltage, alternating voltage, resistance, and audio levels. Some models can also measure alternating current, capacitance, inductance, and certain parameters of semiconductors (such as β). 1. Structure of … Read more
Correctly using a multimeter can not only quickly determine the location of faults but also prevent damage to electrical equipment and the multimeter itself. Below, I will share some tips for using a multimeter. Measure first check the range, not checking means not measuring Do not change the range while measuring, switch to the empty … Read more
This article will rewrite the handcrafted OS – a function running the minimum core code of FREERTOS, as shown in the figure below. Mainly: rewriting vTaskSwitchContext + background tick interrupt automatically switches tasks. In fact, the functionality has been completed in two articles, but it seems clumsy to represent using UART. This article aims to … Read more
More content can be found in the Linux system knowledge base package (tutorials + videos + Q&A): Linux System Knowledge Base Package Article Directory 1. Setup Stage: Transaction 1.1. Token Packet 1.2. DATA0 Data Packet 2. Explanation of Optional Data Stage Packets 3. Explanation of Status Stage Packets Control transfer consists of three stages: setup … Read more
Previously, we introduced how to make a logic analyzer and oscilloscope using RP2040. Today, we will build a logic analyzer using FPGA. Currently, the mainstream architecture of logic analyzers in China uses FPGA + USB PHY. The combination of the advantages of FPGA and the high accessibility of USB has allowed it to occupy the … Read more
Recently, a colleague at the company asked me: “Can an oscilloscope be directly connected to the 220V voltage between the live wire and the neutral wire? Will it blow up?” Because it indeed exploded once before, it left a lingering fear~ I believe many of you have similar questions, so today I will summarize this … Read more
Editor’s Note: Oscilloscopes are almost an essential tool for electronic engineers, but not every engineer can use them effectively. This article shares seven common mistakes encountered when using oscilloscopes. These may align with what you’ve seen or differ, but of course, this is subjective. Ideally, all probes should be a wire that does not interfere … Read more
Editor’s Note: This article is primarily compiled from Keysight’s related content on probes. Oscilloscopes have expanded their application range due to the existence of probes, enabling online testing and analysis of the electronic circuits being measured, as shown in the figure below: Function of Oscilloscope Probes The selection and use of probes need to consider … Read more