I am testing a simple analog data acquisition VI using the USB-6008 device, which is a low cost multii-function device (analog in, analog out, etc) with a USB connection. When I run the attached VI it works fine if the total sampling time is ubder 10 seconds (i.e. if Number of Samples per Channel/Sampling Rate <=10 s). When the total sampling time exceeds 10 s, I get error -200284. Combninations that work include 10K samples/channel and sampling rate=1 kHz (total time=10 s) and lower rates and numbers of samples, as long as total acquistion time <=10 s. But if rate=20 and number of samples=250 (i.e. 12.5 s) or if rate=1kHz and number of samples/channel=11000 (i.e. time=11 s) then I get error -200284.
Snapshots of block diagram and front panel attached.
Why? Assistance appreciated. Thank you.
Bill
P.S. Full error message is "Error -200284 occurred at dataacq_simpleexample.vi. Possible reason(s): Some or all of the samples requested have not yet been acquired. To wait for the samples to become available use a longer read timeout or read later in your program. To make the samples available sooner, increase the sample rate. If your task uses a start trigger, make sure that your start trigger is configured correctly. It is also possible that you configured the task for external timing, and no clock was supplied. If this is the case, supply an external clock."
P.P.S.
The 10 s "limit" applies whether the number of channels collected is 1 or 2. The limit also applies if the data is collected as "Unscaled" (U16) or scaled (DBL).
Adding a sequence structure contianing a wait, and running the task and data arrray signals lines through the sequence with the wait, with wait time=expected data acq time, did not fix the problem.
