Difference in waveform data and scaled data

[Gurdas]

Whats the difference in waveform data, scaled data and binary data? The more descriptive the answer the better.

Thanks in advance!

Gurdas
gurdas@qagetech.com

[Spencer S.]

Gurdas,

Binary data is an array of unscaled analog input data. Scaled data is an array of single-precision scaled data units. Waveform data is an array of waveforms. A waveform is a type of cluster, which contains an array of double-precision scaled data units (Y), an initial timestamp (t0), and the time difference between data points (dT).

The link below offers more information regarding the relationship between binary and scaled data (conversion):

When Using the Analog Input DAQ Functions, How Do I Convert Binary Data to Scaled Data (Voltage Values)? [link removed; article no longer available]

Good luck with your application.

Spencer S.

[Gurdas]

That helped. Thanks Spencer.

I need to acquire waveform data on 5 channels out of which 4 are slow (Temp-2, RPM-1 and Load-1 all at say 10 samples per second) while one is fast (vibration at 50K samples per second). DAQ board is 6023 and software version is 6.9.2. Using LVPDS 6.0

Presently, I am acquiring waveform data on all channles (0 to 4) at 50K. But I need to discard the unwanted data on non-vibration channels. Is there a vi which allows me to pickout just the first (or Nth) sample from the waveform data? All channels need to be displayed (graph mode) and saved separately.

- Gurdas

[Spencer S.]

Gurdas,

Try using "Get Y Value.vi". This VI is located in Functions >> Waveform >> Waveform Operations. It allows you to specify the index of the data value you desire.

Spencer S.