Using USB-6008 software timimg Generate waveform

I am using USB-6008 device. Base on it's User Guide, this device on support software-timed and maximum update rate is 150 Hz.
By place a time delay VI for 1ms, I have a 1.660Hz sine signal. Is this wrong for place a time delay VI for software timing?
I would like to generate a 60 Hz signal by using software-timed VI on USB-6008 device. How should I do?
Thanks a lot.

DephinTW,
The update speed of the USB-6008 is largely dependent on the speed of
you computer as well as anything else on your USB bus. If you are using
an older computer or have other USB devices on the bus, you may not
achieve this rate. In order to output a 60Hz signal, the minimum output
sampling rate is 120Hz. This corresponds to an 8.3 msec. delay between
samples. Instead of using the "Wait" VI, you should try using the "Wait
Until Next ms Multiple" VI. Place this in parallel with your
generation. This will synchronize the output with multiples of the PC
clock, rather than waiting for a fixed amount of time, irrespective of
code and USB overhead.
Hope this helps,
Ryan V.
National Instruments
Ryan Verret
Product Marketing Engineer
Signal Generators
National Instruments

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Analog Devices AD594/AD595 Monolithic Thermocouple Amplifiers (Type J / Type K)
This would give you a conversion of 10mv per degree C using a single +5v supply you could get to a couple of hundred C
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Message Edited by Conseils on 05-08-2007 08:51 PM
Message Edited by Conseils on 05-08-2007 08:52 PM
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Why not use USB 6008?

Hi,
I have an application that requires me to sample 6 AI channels at 1 kHz.
Processing every 20 ms.
I also need to output a PWM on 3 channels.
Normally I'd use PCI-DAQ cards.
e.g. a PCI-6023E and a PCI 6601 (timer/counter).
This costs about 700€.
Why shouldn't I use a NI USB 6008 (145€)
and two NI 6501 (99€).
Is there a big difference in programming and performance?
Are those devices all USB-2?
Because If I sample at 10Khz, I do not suppose that all that
data can go over a USB1-bus.
Thx !

Hi!
My observation is that a 6008 will work for you if you only need to acquire 6 channels at 1 kHz and you can handle 11 bits of resolution (to use six channels you must be in single ended mode, which losses one bit of resolution on this board). The other possible disadvantage of the 6008 is that you will have to learn to use DAQmx Base, if you haven't done so yet. However, if you are familiar with DAQmx, this should not be too difficult.
As for digital output, using two 6501's may not work for you. They will be software timed digital outputs, where it seems that you were looking for hardware timed outputs before (6601).
Both of these devices are USB 2.0 Full-Speed, which can handle this amount of data.
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rpm sensor design.vi ‏70 KB

Hello Dadsf,
Welcome to the NI Discussion Forums! From your post, you would like to be able to count the number of pulses from your sensor that occur during a period of time and convert this to RPM. Let me know if I have interpreted this incorrectly. Your USB-6008 manual indicates that the device has a built in counter that can be used to count falling edge signals. If your sensor outputs digital signal this would be a good way to go. You can take the number of pulses that occur over a certain period of time (perhaps between two loop iterations) to find the number of pulses per second. The longer the period of time you acquire pulses for, the more accurate your average RPM will be. This will be at an expense of how often the user is updated with a new RPM value. Check out the links in my signature for some great information on how to get started with DAQmx and what all of the different terms in the DAQ Assistant mean.
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pneumatic diagram.jpg ‏33 KB

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Using USB-6008 software timimg Generate waveform

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