In his famous essay *Chibi Fu*, Su Shi once wrote, “The breeze on the river, and the bright moon between the mountains — what is heard by the ear and seen by the eye becomes a moment of beauty.†This poetic reflection highlights how our senses, particularly sight and hearing, serve as the tools through which we experience the world. Similarly, in the realm of product development and manufacturing, the "eyes" and "ears" of technology—such as sensors and monitoring systems—are essential to ensure that products perform as intended.
In daily life, we can feel temperature, humidity, brightness, and color emotionally, but with the help of appropriate tools, these sensations can also be measured and quantified. This process is known as signal sampling and analysis. Real-world signals are often continuous and ever-changing, like a constantly fluctuating curve—this type of signal is referred to as analog.
To better represent or record such signals, we often convert them into digital form. For example, temperature is commonly expressed in degrees Celsius, while color is represented using the RGB color model, which uses ratios of red, green, and blue to define a specific hue. By converting analog signals into digital ones, we enable precise and repeatable measurements.
There are various methods for analog-to-digital conversion (ADC). In electrical engineering, ADCs are used to sample signals. The basic principle involves capturing the signal through a sample-and-hold circuit, then converting it using an ADC chip. The more bits the ADC has, the higher the sampling speed and the more accurate and detailed the digital representation of the original signal. The figure below illustrates this process.
Analog-to-digital conversion is a crucial step in most electronic measurement instruments, such as oscilloscopes, multimeters, power analyzers, and data acquisition recorders. Each instrument has different requirements in terms of accuracy, speed, and the number of channels needed. For instance, oscilloscopes require extremely high sampling rates to accurately reconstruct waveforms, while multimeters prioritize precision, and data acquisition recorders often need multiple input channels for simultaneous signal collection.
Data acquisition recorders are widely used to collect and store various types of signals from a device under test, such as temperature, humidity, voltage, current, and alarm signals. The method of signal acquisition varies depending on the type of signal. For DC voltage and current, direct sampling is possible. However, for temperature, a sensor like a thermocouple or resistance temperature detector (RTD) must first convert the temperature into an electrical signal before it can be measured.
Many applications require the simultaneous collection of multiple signals, which means the data acquisition recorder must have multiple channels and expansion capabilities. ZLG Zhiyuan Electronics' DM100/DP100 series data acquisition recorders are multi-channel, scalable, and high-precision devices designed for industrial environments. They can collect DC voltage, DC current, digital signals, temperature, humidity, and more. The system displays real-time measurement results and allows for custom operations such as linear transformation, square root calculations, or user-defined expressions. The results can be saved, stored for over 60 days with 8GB or more memory, and exported in text or binary format for further analysis.
Once the DM100 module collects the data, users can perform various mathematical operations on the measured values, such as linear scaling or square root extraction. These values can be used as variables in custom expressions, and the final results are saved for future reference. The system supports comprehensive reporting based on selected channels, making it a powerful tool for engineers and researchers in various fields.
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