difficulty adding input to timing and transition block in signal express

[svt4cobra6]

Probably missing something simple here but I am tring to use the timing and transition block to perform timing measurements based on data I am trying to read in with the NI-HSDIO Acquire function.  In the LabVIEW signalExpress form where the Project is listed on the left, I am able to insert the NI HSDIO Acquire function before the timing and transition function but in the NI-HSDIO Acquire function it displays no device and does not seem to allow a selection of the PXI slot that contains the digital I/O card.

Thanks.

[DFGray]

There are two issues:

1. SignalExpress is not finding your HS-DIO board.
2. Timing and Transition operates on analog data and the HS-DIO generates digital data.

The second is probably the worse problem. SignalExpress is predominately an analog analysis tool, with few blocks that accept digital data.  If you are reading in a single line of digital data, you can convert it to analog data (Convert Digital to Analog), then use the Timing and Transition step to find the frequency, period, etc.  This will only work for a single line.  Timing and Transition is designed to analyze analog representations of a digital pulse train for things such as overshoot, undershoot, etc.

If this solution works for you (try it with simulated data using the Create Digital Signal step), then look at getting your HS-DIO board to show up.  First, from your Start menu, open Measurement and Automation Explorer (MAX).  The installer puts a shortcut for this on your desktop, as well.  Check the Devices and Interfaces entry in the tree on the left to make sure your device shows up.  If it does not, hit F5 to refresh.  If it still does not, look through the following:

1. Reinstall/repair the HS-DIO drivers.  Something may be corrupted.
2. If you have not done so, identify your PXI rack in Devices and Interfaces.  This identifies the processor controlling the rack.
3. If you are using MXI-3, make sure you have installed the MXI-3 driver.  If you are using MXI-3 hardware and running Windows Vista or Windows 7, it will not work.  The OS is incompatible with the hardware.  You will need to replace the MXI-3 interface with a MXI-4 interface.

If none of this works, let us know and we can explore other possibilities.

[Jim_S]

Hello svt4cobra6,

With the NI-HSDIO Acquire Function, are you trying to use this with the PCI-6533 like in your other post? If you are, this isn't going to work because the PCI-6533 isn't supported by the NI-HSDIO driver but by the DAQmx driver. If you are using a 654x, 655x, or 656x, DFGray's info will help you solve the problems you are having.

[svt4cobra6]

thanks for the responses, using the 6542 card, kind of like a digital scope or analyzer.  Just looking at trying to make timing measurements with captured signals, sounds like signal express works well for analog data.