help pulse width measurement using counter 0

[DAQ_Newbie]

hi

Ive been struggling with measuring a TTL pulse width using ctr0. My pulse duration should be in the region of 10ms - 100ms. Even though i change the min and max signal input range values in MAx, I keep getting a measured value in the range of nanoseconds (see pict). Also, an error msg keeps popping up specifying that  the "Specified operation did not complete, because the specified timeout expired." 

this means that MAX did not detect any signal fall onto PFI9 pin. Ive physically checked that there in voltage drop in the TTL signal though.

cheers

regards,

don
 

[Bueller]

Hi Don,

Can you please provide more information on how you are doing your measurement? Are you using LV ? and what is the device you are using for the measurement?

It seems that the picture didn't go through, can you please reattach it.

Best regards,

Faris

[DAQ_Newbie]

Hi Faris,

cheers for replying. Yes i am using labview 8.5 and a pcie 6259 card with a SCC 68 break out box. ooops, i`ll attached again.

So im still struggling measuring the pulse width of my TTL signal using ctr0. My signal is from an optical switch which is in a constant high state. When an object passes thru it, it brings the latter down to a low state for about 20ms. When i try to do the measurement in MAX, some number in the nanosecond range appears in the measured value textbox, and also an error msg stating that the specified timeout has expired which suggests that no signal change has occurred at the GATE (pfi9).

Also, ive checked that the signal was properly grounded. Im running out of ideas 😞

looking forward to hearing from u. 🙂

thx

[PBear]

Hi all,

This is a duplicate issue to this post found here: http://forums.ni.com/ni/board/message?board.id=250&message.id=43741

Let's keep all replies for this topic containted to the original thread as this will help keep our forum community organized and have less clutter. Don, if you have further information, please post it on your original thread. Thanks all!