Multi-channel DAQ

[stan1860]

Previously, I posted a question regarding multi-channel DAQ via following link and Dennis Knutson helped a lot.

I changed the vi and it is attched. Now I have some questions regarding this vi.

1. The sampling frequency

It seems that the sampling frequency drops dramatically. This can be obtained from the size of the data file. The DAQ system is set to run at 10K Hz. When it is 1-channel, the data file is about 20MB. But when it is 4-channle, the data file is only 4KB, which is unreasonable.

1. The data saving format

I plan to save the data in following format, with each column corresponding to a specific channel.

time	Channel_0	Channel_1	Channel_2	Simulate signal
Time	Data_0	Data_1	Data_2	Simulate data

With the present vi, all the data can only be saved in one column. 

[Dennis_Knutson]

You are throwing away most of the data by doing the conversion from dynamic data. Why? The dynamic data is more likely a 2D. Use the Write To Measurement until you understand dynamic data or stop using Express VIs that use it.