Posts Tagged ‘sample’

PC Automated Pressure Measurements

Friday, October 23rd, 2009

Pressure Cooker

Pressure Cooker

One of the vivid memories from my childhood is working in the garden picking vegetables. We lived on a farm and it was common to have a big garden. My mother would can all types of food, such as tomatoes, pickles and green beans. Part of this canning process involved boiling the jars of food in a pressure cooker. The release valve, with its hot hissing steam escaping, always intrigued me.

Canning food in the kitchen is a relatively simple process and easily controlled by the cook, but there are many other applications where it makes sense to automate the process. (more…)

Understanding Expert I/O 1000 Access Times

Friday, August 14th, 2009

Expert I/O Timing

Expert I/O Timing

I often get questions about the Expert I/O 1000’s access time characteristics. The short answer is that you can change outputs at a rate of 100Hz and you can read inputs at 50Hz. However, the complete answer is more complicated.

When dealing with MS Windows on a PC, it’s not possible to get absolute realtime results. You will always have some variability in timing. However, Dajac’s USB implementation directly associates the timing to guaranteed values in the USB specification. Therefore, we know the guaranteed worst case access times at the USB level. (more…)

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