That means 'samples to read' really means
Hi all
I use a capture of data PCI-6259 now card to read data from multiple channels. However, I don't really understand the "sample to read" node in "DAQmx read.vi.
In my opinion, if I use the DAQ to sample multiple channels, this "sample to read" would be the number of samples per channel. But I don't know if sampling is at the same time or not? If not, how do simultaneous samples for different channels? According to the user mannual, data acquisition must support a simultaneous sample of channels of the difference, or I was wrong?
Kind regards
Rui
There are three parameters that control the time of an acquisition in DAQmx:
Sampling frequency
This control hurries samples are taken. This is specified with respect to the samples per second.
Samples per channel
For a finite acquisition, it is the total number of samples that will purchase your program. For a continuous acquisition, it is just used to help determine the size of the buffer.
To read samples
It is a setting on the DAQmx Read VI. This allows to determine how many samples per channel is returned whenever VI Read is called. The value '-1' returns all samples that are available. If the specified number of samples are not available with the VI Read is called, reading VI hangs until the samples are available, or until the time which is connected to the terminal "timeout" runs.
Thus, for example, if we have an application with the following parameters:
Samples rate = 1000 s/s
Samples per channel = 5000
Samples to read = 100
Then the application will gather 5000 total samples at a rate of 1000 samples per second. The total acquisition will therefore 5 seconds.
We will need to call playback VI 50 times, because whenever we call the VI, it is up to 100 samples available.
Inter channel time-out is controlled by the property of the clock to convert frequency I. The smallest value, for it can be programmed is the sampling rate overall maximum reverse for your motherboard. The default rate is 10 to allow for extra time, unless your sampling frequency is greater than 100 kech. / s, in which case, we use the smallest possible value.
So, for example, my PCI-6289 has a sampling rate overall maximum of 500 kech. / s (as indicated by the specifications). My inter channel a minimum period is so opposite of 500 kHz, or 2 uS.
You can set the clock frequency to convert HAVE using the DAQmx Timing property node:
I hope that clarifies things!
Tags: NI Hardware
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