how accurate is "amplitude and level measurement"

[schorsche]

Hi all, do you know how accurate/fast the "amplitude and level measurement" express vi in Labview 7 is?
I want to determine the peak to peak value of a single, 300 kHz burst (DAQ Card) and was wondering what would be the best and most accurate way to program this.

Many Thanks

[Tristan_J]

Hi schorsche,

The accuracy of the amplitude and level measurement will be the same as your DAQ measurement (double precision 64-bit). It will search through the array of data for each channel and calculate the difference between the highest and lowest values, returning an array with the p-to-p value for each channel.

If you are concerned about processing speed, use the amplitude and levels.vi, however this vi can only handle one channel at a time.

Kind Regards

Tristan
Applications Engineer
National Instruments (UK)

[Tristan_J]

Hi schorsche,

Slight mistake on my part, the amplitude and levels.vi is polymorphic so can process multiple channels (right click on the sub VI>>select type>>amplitude and levels N channel). Therefore unless you want to make use of the other features of the Express VI, the amplitude and levels.vi will be your best choice.

Regards
Tristan

[Alloush]

HI I got it to work but not with the express VI,


Thank you