How to use an analog signal to conditionally generate a TTL(or square function) signal?

[Matt11]

Hi everyone,

I am using PCI-6229 and trying to develop a code that can generate a TTL/square function signal as soon as one analog input satisfies following conditions: 1. Crossing a certain value (say, 0 V); 2. Falling edge slope. The time delay between the crossing point and newly generated TTL/square signal will be critical in my measurement, and it should not exceed 1 millisecond. Any suggestion on it? Thank you in advance!

[Dennis_Knutson · Accepted solution]

Are you actually using the Excel add-on called Measure? That is what this board is for. Otherwise, you should post to the Multifunction DAQ board and mention the language that you are using.

[Matt11]

Thank you, Dennis. I think you are right, and I should have posted it on DAQ board. Thanks again!