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Home FAQ |
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What should I do if I want to measure the output of a sensor with a data acquisition board? |
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The output of a sensor can be voltage or current. If the output is voltage signal, the drive ability should be considered. If the output is current, we can measure the current by measuring the voltage of the sampling resistance, what should be paid attention is that one side of the AD board connects the ground. The order of the connection should be: the power supply, the sensor, the sampling resistance, and then the ground. |
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What are the essential devices for data sampling and analysis? |
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Firstly, the sensor is necessary. Selecting the sensor depends on what will be measured. For instance, a temperature sensor will be used when measuring the temperature, and also some relevant sensors are needed when measuring the pressure, acceleration, acoustics, displacement, rotational speed, angular velocity, and slope and so on.
Secondly, acquisition device is also necessary, for example, PC-based measurement and control boards like PCI, USB and so on, SCM-based data acquisition devices, and also the oscilloscope is signal acquisition device.
Finally, signal analysis, time domain analysis and frequency domain analysis are the most common. You can do the analysis by programming by yourself or use the existing software to analyze the signal, but for some special signals there are advanced analysis. There are many programming software, such as LABVIEW, VB, and VC++. The premise is that the acquisition system can identify and support the language or the software. The software compatibility of our products is quite good, they are competent to identify and support most of the fashionable programming languages. |
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How to choose the Single-end input mode and the Differential input mode? Do the two input modes affect the testing resolution? |
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Single-end input judges the voltage difference between the signal source and the ground.
Differential input judges the voltage difference between the two signal lines.
If the signals are interfered, when using the differential input, the interference will affect the two differential input lines at the same time, but the voltage difference is small (good anti-interference); when using the single-end input, the one single-end input changes, but the ground voltage keeps the same, so the voltage difference is big (bad anti-interference). In a word, the anti-interference of the differential input is better than that of the single-end input. |
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Why does the analog input have the Single-end mode and Differential mode? |
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The signals from the industrial site always contain interference, especially Common-mode Interference. Differential input mode can eliminate the Common-mode Interference by using a differential amplifier. Single-end input mode is a suitable way for the clear signal source.．A differential input is made up of two single-end inputs，so the capacity of single-end input is double that of differential input. The figure above is the single-end and differential wiring diagram． |
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