It is the quantity of scalar qualities or waveform focuses per channel (or plot) put away in the outline history cushion. You can change this property by right - tapping on the front board waveform diagram and choosing Chart History Length . An exchange box will seem requesting the quantity of data of interest or waveforms in the graph history cushion. Graph History for Scalar Values When a scalar worth or a one-layered exhibit of scalar qualities is joined to a waveform outline, the Chart History Length addresses the information for each channel that the waveform diagram will store and show at runtime focuses. This should be visible in the accompanying screen capture, where two separate history lengths (10 and 200 data of interest) are chosen for similar information: Waveform Graph History for Waveforms If you interface a waveform information type to a waveform outline, the diagram The Chart History Length shows the quantity of waveform focuses per channel that the waveform chart will store. The thing that matters is that a waveform information point contains a variety of y data of interest. For instance, as a matter of course, the Sine Waveform VI used to make the accompanying figure has a variety of 1000*y data of interest in one waveform point. So putting away 10 waveform focuses in the outline history will show 10000*y data of interest on the diagram. This should be visible in the accompanying screen shot, where two separate history lengths (10 and 50 waveform focuses) are chosen for similar information: Multi-Channel Waveform History (Multiple) The Waveform History Length is per channel . In this manner, it doesn't influence the presentation of numerous plots. For instance, assume the Chart History Length is set to 10 pieces of information. In the event that you plot a 2D exhibit of scalar qualities addressing numerous information channels, the waveform chart will store 10 data of interest for each channel (or plot), as displayed in the first screen capture.