Home FAQ |
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Can the data be acquired from all the channels when there is only one signal input channel? |
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The A/D board has high input impedance. The value of the input impedance can be 10M-1G Ω. At the same time, there is no resistance between the channel and the ground. So the signal input value can not be zero. To solve the problem, we can connect the vacant channels to the ground or put a 1K-1MΩresistance between the vacant channels and the ground . It certainly will not affect the signal input channel. So if it is not necessary to show the data from the vacant channels, users do not need to care about them. |
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How to connect the AGND pin and the DGND pin? |
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Generally speaking, there is Analog Ground (AGND) pin and Digital Ground (DGND) in a data acquisition board. It will make mistakes unless we connect the AGND pin to the system AGND plane and the DGND pin to the system DGND plane. |
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What should I do if FIFO is overflowing? |
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1）Buy a FIFO with bigger capacity. But this method can't solve the problem radically. The better way is improving the efficiency of the system.
2）Use the DMA mode. It can get a quicker speed than the Interrupt mode.
3）Reduce the sampling frequency.
4）Select a computer which has a better bus performance.
5）Select our company products which have the self-check function. When FIFO is full, the alarm will automatically go off, and sampling process will stop reading the data at the same time. |
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