Signal speeds

[vadajooz]

Hi guys ,

I have a daq 6008 ,measuring rotational speed with a hall effect proximity . I have tried connecting it the three way I can with the 6008 . ie. Digital I/o counter and analogue voltage input. The input is used to fire a timer to perform calculations.

the counter dost work atall really, I know its only an event counter but the counts are never the same as the rotations. When useing the digital input and the speed increases it input misses pluses .

The analoge input , the proximity is switching 12v to the analogue input , I have the vi set up to read after 2v due to noise at around 1v, the problem is when the rotations increase the switched voltage drops , and alto above 2v the daq dosnt see it , is the daq not quick eggnog's or am i missing some code that i could use .

thanks for any advice

[david.bolt]

Dear Vadajooz

There is a very similar forum post and a solution to what you are trying to achieve at the below URL:

http://forums.ni.com/ni/board/message?board.id=170&message.id=400251&requireLogin=False

Let me know how you get on with the VI they posted and if their advice helps.

Message Edited by david.bolt on 04-06-2010 07:33 AM

[vadajooz]

hi david , that link goes to my profile ??

[david.bolt]

Dear Vadajooz

My apologises, here is the forementioned link:

http://forums.ni.com/ni/board/message?board.id=170&message.id=400251&requireLogin=False

[vadajooz]

ok thank you ,

i will try it and see what happens , my daq is dead at the moment , so it needs to go back to the shop !!

[david.bolt]

Thanks for your reply Vadajooz.

You should contact your local National Instruments office if you bought the device from us whereupon we can repair the module if deemed faulty. Thanks.

[vadajooz]

i have done , i opened a service request and have been in contact with ni . any idea how long it could take ?

[david.bolt]

Unfortunetly I cannot quote estimated delivery times. The engineer dealing with your servcie request will be able to advise on this. I look forward to hearing how you get on with the advice from the other forum.