Hi Martyn, The problem is solved by increasing the sampling rate and then applying downsample. Many thanks. Rapid block will be the correct mode, you will need to set Memory Segments to something larger than 20000, say 1000000, and NoOfCaptures to 20000. Your sample interval is 1usec, time base is t...

I've been using Pico 6404D recently for data acquisition and got stuck with trigger problem for sometime. The situation is that I read output from a Thorlab photodiode using 6404D in Channel A with Labview2014. In the meantime, I got a sync out signal from another device as a 20KHz standard TTL (5V)...