What is the use of the data acquisition instrument?

Su Shi said in "Chibi Fu" that "the breeze on the river, and the bright moon between the mountains, the ear is the sound, the encounter is made", the ears and the eyes are the harvesting instruments for humans to obtain the "worldly beautiful scenery", and In the product development and production, "eyes" and "ears" are also required to ensure product performance.

Temperature, humidity, brightness, color, we can all feel emotionally, with the help of the corresponding tools can also be quantified, this process is the sampling analysis of the signal. The real signals are constantly changing, such as a constantly changing curve, which we call analog.

In daily work, in order to better represent or record signals, we often digitize analog signals, such as temperature, how often we use degrees Celsius to express temperature; and, for example, color, we use a ratio of RGB three primary colors to represent a certain The color is such that the original inductive signal is converted into a signal that can be quantified. This process is the process of analog to digital conversion.

There are also many methods for analog-to-digital conversion. In electrical terms, we usually use ADC to sample the signal to achieve the effect of analog-to-digital conversion. The basic principle is to introduce the signal through a certain sample-and-hold circuit, and then use the ADC chip for data sampling, ADC chip. The more the number of bits, the faster the sampling speed, the more precise and dense the signal is, and the process of analog-to-digital conversion is shown in the figure below.

The conversion of analog-to-digital signals is the first step in the operation of most electronic measuring instruments, such as oscilloscopes, multimeters, power analyzers, data acquisition recorders, and so on. The accuracy, speed, and number of paths required for analog-to-digital conversion vary from instrument to instrument. For example, the oscilloscope requires extremely high sampling speed. Only the sampling speed is fast enough, and the restored waveform can be closer to the real curve. For example, the multimeter has extremely high precision for sampling; and the data acquisition recorder has the largest demand for the sampling channel number. . Here we talk about the data and characteristics collected by the data acquisition recorder.

Data acquisition recorders are often used to collect and record the temperature, humidity, voltage, current, alarm signals, etc. of the product under test. Different signal sampling methods are also different. For example, for DC voltage and DC current, direct access acquisition can be performed. For temperature signals, it is necessary to convert the temperature signal into a voltage or current signal through a sensor such as a thermocouple or a thermal resistor. After that, the collection is performed, and then converted into temperature information after collection. Many applications require simultaneous acquisition of multiple signals, which requires the data acquisition recorder to have multiple acquisition channels and expansion capabilities.

ZLG Zhiyuan Electronics' DM100/DP100 series data acquisition recorder is a multi-channel, scalable and high-precision data acquisition device. The data acquisition recorder can collect DC voltage, DC current, digital quantity, temperature, humidity, etc. The sensor signal data displays various measurement results in real time, and performs custom second operation and alarm output operations on the measurement results. A single host can be expanded to up to 200 acquisition channels, and multiple hosts can be cascaded. It is a multi-channel data acquisition and recording device suitable for industrial environments.

After the DM100 data acquisition module collects the semaphore, the user can obtain the required measurement value by linear operation, linear operation, square root operation, etc., and can also perform custom expression calculation on the measured value, and the measured value or operation The value is executed as a variable in the expression, and the result of the operation is saved. The measurement data can be saved in the memory in time, support the storage capacity of 8G or more, continuously record the measurement data for more than 60 days, and generate reports according to the specified channel, and export text or binary format to facilitate data statistics and analysis.