For a research project, I am preparing an acquisition system based on a NI CompactDAQ (NI cDAQ 9184) with NI 9234 (4 accelerometers), NI 9203 (4 current sensors), and NI 9237 (4 strain gages). The hardware will be controlled through a LabVIEW program, saving all data in a common file.
In my project is fundamental that all sensors (in 9234, 9203 and 9237 in same 9184 cDAQ) are perfectly synchronized and it is mandatory that the final acquisition rate is 500 Hz for all sensors, too.
Is it possible?
After a general search I am still with doubts how can achieve the synchronization of all sensors taking into account that they will be in three different modules:
- Is it enough to configure all devices into the same “DAQ assistant” in LaBVIEW to ensuring the perfect synchronization?
- In that case, which should be the native acquisition rate since 9234 and 9237 have specific supported rates and they are not coincident (see http://digital.ni.com/public.nsf/allkb/593CC07F76B1405A862570DE005F6836)
- Are there a more recommended (proper) ways to synchronize the modules for this purpose?
- I found this explanation http://www.ni.com/white-paper/11549/en/ but I am not sure that this may be effective in my case (which figure should I follow?) and if it updated taking into account the last “DAQ assistant” function.
- In LabVIEW, how should I perform the decimation to keep the synchronization of data?
Excuse my questions but it is not simple to test and to assess the validity of the synchronization.
Thank you in advance for your support.
Regards,
CR