How to use startscan signal for triggering for E-series DAQ

[wyuan]

Hi, I want to collect the engine cylinder pressure data with a PXI-6070E DAQ card and BEI Encoder. I want to use the TDC signal as trig1, and crank angle signal as startscan for triggering. Could anybody give me an example or suggestions about doing this in labview. I cannot find any example that uses startscan signal for trigging. Thanks.

[Photon_Dan]

There is an example VI that is installed with LabVIEW. It is called "Cont Acq&Graph ExtScanClk D-Trig.vi" and it is located in the following LLB.

\Examples\DAQ\anlogin\anlogin.llb

Your project aligns very closely with a past project of mine. If you require professional expert assistance, feel free to call on us.

Daniel L. Press
Certified LabVIEW Developer
PrimeTest Corp.
www.primetest.com

[wyuan]

Thanks. I have tried Cont Acq&Graph ExtScanClk D-Trig.vi, but it doesn't work. What I did was to connect a 50HZ pulse to PFI0 (analog triggering, I changed the code from digital triggering to analog triggering), and a 100K pulse to PFI7 (startscan), and a analog signal to ACH0. But the code always says: timeout. If I use internal clock, it works fine. Could you please give me some help more? Thanks.

[Photon_Dan]

Do not switch to analog triggering if you are triggering off of a digital pulse! Your 50 Hz signal wired to PFI0/TRIG will gate the start of acquisition. AI Start will wait for it. Your 100 Hz signal wired to PFI7/STARTSCAN will be the sample clock.

Daniel L. Press
PrimeTest Corp.
www.primetest.com