Hi Brooks, I am studying the possibility to acquire a waveform by using PCI 6251. The waveform is a low frequency saw-tooth like one. The period is only 667 ms. My tested system is like the following. Input is a saw-tooth like signal, from 0 to 225 ms the signal is increasing from 0.5V to 6V linearly, from 225 ms to 667 ms the signal remains 0.5V. There are 2 output signals for the system. I use PCI-6251 to acquire the data for these 2 output signals simultaniously. The period of these 2 signals is also 667ms, their signal amplitude is within 10V, their waveform shape is not known, but should be similiar with the input signal. I just wonder whether PCI-6251 could acquire these 2 output waveform without distortion, whether PCI-6251 acquires the data fast enough to get the correct waveform. According to PCI-6251 specification, sample rate for multiple analog input is 1MS/s. How am I sure it is enough to acquire the 2 output signals. Thanks.