Home FAQ |
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What are the resolution and the system accuracy? |
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The resolution refers to the ratio of maximum value and minimum value in the specified range. Resolution is usually expressed as a percentage (such as the PCI8646 is a collection 12 of the AD board. The resolution is 1 / 4096 * 100% = 0.0244%). Or regard resolution as 12 (binary), corresponding to distinguishing voltage = V / (N +1), V: maximum input, N: AD maximum reading. The system accuracy refers to different value between the system measurement value and the theoretical value. |
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Why sometimes the motherboard USB interface can not use the acquisition card? |
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The acquisition card should be guaranteed to work in the normal voltage (usually +5 V).
USB interface provides the voltage which will drop the pressure under the condition of being applied load(capture cards), resulting in the output voltage to a load less than the normal operating voltage, so if the board can not be found , it can not be read and written. This usually needs the slight change in the way of USB power supply and circuits. There are a number of motherboard manufacturers, manufacturing motherboard whose USB port is not sufficient in the power supply , and it is in lack of drive maybe below 350mA, so certainly this kind of acquisition card can not identify and work.
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Is USB data acquisition device a good choice?What kind of applications are USB data acquisition devices most suitable for?Can I use multiple USB devices on the same computer at the same time?How far can USB DAQ devices be away from the computer? |
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A: First, currently on the market, almost all the computers are equipped with USB (Universal Serial Bus) interface. USB is not only a very popular bus, but it is also very easy to use. Due to its plug-and-play features, the installation into the notebook computer can be conveniently carried out in any kind of work spots for a variety of measurement tasks, and Art USB data acquisition device can take full advantage of USB plug-and-play functionality, making it extremely simple to install.
Second, the portable voltage and the measuring environment, board data acquisition / recording,
embedded OEM applications, application of University Laboratory.
Third, if your application needs more than one single-channel-count which USB data acquisition device can provide, you can take advantage of existing USB hub in the computer as a USB interface to install multiple USB DAQ devices.
Forth, USB Specifications of the USB limit your computer, the device or hub within 5 . You can use at most 5 hubs to make the distance between equipment and computers reach 30 meters. |
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