USB 8451 no timer / counter ?

[Brandy1985]

Hi all,

i´m not sure if i´m in the right topic now, but i found no answer with the search function.

I tried to generate an digital pulse using timer/counter functions with Labview 8.5 and an USB 8451, but it didn´t work.

Is it possible that the USB 8451 doesn´t support timer / counter signals?

Thanks for all your answer!

[PeterAdelhardt]

Hi Brandy1985,

The USB 8451 does not offer counter/timer functionality. It has the built-in SPI/I2C interfaces. Therefore, no counter functionality is implemented on this device. On the 8451 you can only use static (i.e. software timed) digital I/Os. If you need counter operations you probably should look into acquiring another digital or multi-function device - low cost options could be the 6008 (multifunction) or 6501 (digital).

Best regards,

Peter

[AnalogKid2DigitalMan]

I would not suggest using the 6008 for pulse generation, it is a software timed device. You may be able to get up to 1kHz, but the frequency may not be stable.

-AK2DM

[PeterAdelhardt]

Hi AK2DM,

thanks for catching this one. I missed the important piece of information that the original poster would like to generate pulses. We have a KB-entry for this. You could also generate software-timed pulses with the 8451. The jitter (timing deviation), as you mentioned, could be a problem. The same issue arises with the 6501 I mentioned!

For generating pulse trains I would recommend a basic E or M series device such as the 6210 USB.

If you have further questions, don't hesitate to ask.

Best regards,

Peter