Dear, a-I am using NI Express Workbench version 1.1.0 (Labview Signal express) to acquire data by using NI DAQCard-6062E (for PCMCIA) along with BNC 2090 from accelerometers attached to the structural model excited by shaker. The signal express program consist of the following simple steps
1- NI-DAQ max acquire (acceleration from 3 different channels
2- Power Spectrum giving ‘’magnitude’’ etc
3- Save to ASCII (Acceleration of each channel in time domain)
4- Save to ASCII (Acceleration of the selected channel in frequency domain)
The problem is in 4th step that the frequency recorded seems to be fictitious i.e., exceptionally high in the range of 3x109 and so, which is absolutely wrong because the excitation frequency of the shaker is just 1 to 5 Hz which is even clearly seen by the peak from power spectrum display in the range below 5Hz. Then why I am getting such record of unbelievable high frequencies in data file. Your help to get real frequencies in data file would be highly appreciated. Thanks with regards
Abdul Basit
