Generate TTL at a particular phase of a sine wave

[bsunny]

Hi all,

I am new to LabView. I want to generate a TTL at a particular phase of a sine wave ( eg a TTL each at 45, 90 degrees etc). I use these TTL s to trigger my PIV image acquisition. Can anybody please provide me some guidelines to build the VI? Thanks in advance

[Henrik_Volkers]

What type of output hardware do you what to use?

[bsunny]

I want to route the output TTL from my NI 6251 (through BNC connector) to PTU (programmable timing unit). PTU receives the TTL as a trigger to instigate PIV measurements.