Hi everyone,
I have some questions about sampling the quadrature signal from a HDMI port by using the PCI 6221 DAQ card and would like to have your support. Thanks!
1.Question of connection
Can i use a HDMI to BNC conventor to connect the HDMI cable and BNC cable, so i can connet the BNC port to the SCB-68 channel box. Through this connection to acquire quadrature signal?
2. Question of Counter task set up
What i am going to acquire is the signal from a interferrometer. This signal should indicate the strain difference of my object. When i use DAQ assistant, which typ of counter Input should i choose, is that Edge Count or Linear Positon?
And to acquire this quadrate signal precisely, i shoud set the clock of DAQ card faster than the clock of the HDMI interface which will be configured in the sofware of interferrometer. When i open the DAQ assistant, there this a option for sample clock type under adanced Timing, and i can only choose the "external", and have to also choose a clock source, and this step confused me. Can i use a function generator to connect to a PFI channel, and and set the frequency of the signal from function generator as a external clock?