SignalExpress output and inputs sync

[fra87]

Hi everybody

I am using SignalExpress to generate and acquire signals but I am quite new to this software.

The devices that I am using are:

- PCI 6251

- PCI-MIO-16E-1

The 2 devices are synchronized for acquisition: the PCI-6251 uses the clock of the other one.

The output signal is an excitation signal generated via software and sent to the DCO0 of the PCI-MIO and I am saving it to a text file with the other input signals.

During one acquisition I noticed that although the output signal was not zero, the input signals were zero for about 100 samples (sampling frequency: 10kHz): this delay can not be caused by the other instrumentation.

It seemed to me that it was an isolated problem since performing other measurements I did not notice it again but how can I be sure that the output signal is correctly synchronized with the input signals? What should I check on the settings?

Thanks a lot in advance,

best regards

Francesco

[bronzacuerta]

Hi Francesco

can you post the Signal Express project file?

Do you have the full version of the software?

Best

[fra87]

Hi,

I think I solved the problem but to be sure I'll send you the project file anyway.

I think it was a problem of synchronization between input and output: I was using the ai_sample clock of one device as reference clock for both devices for acquisition. I changed the reference clock for the acquisition to to ao_sample_clock of the device that was generating the output signal, the delay now is just 4-6 samples.

best,

Francesco