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LabVIEW Tip - How to ensure you are displaying your waveform graph data accurately


When writing data to waveform graphs and charts using LabVIEW, you need to be sure that the x-axis has been configured to match the units of time you wish to display.

This can be achieved by applying a multiplier to the x-axis. Find the multiplier by right clicking on the graph or chart and selecting ‘properties’ and navigate to the ‘scales’ tab.

Different sampling rates and time update intervals require different multipliers to ensure the data is displayed in the unit of time you require. To calculate the multiplier you apply the formula below:

Multiplier = no. of units of time per second / no. samples per second

Example
If you are sampling data at 1kHz and you want to display it in seconds, the multiplier would be calculated as follows:

Multiplier = 1 / 1000 = 0.001

Waveform Graph 1

Figure 1 – graph displaying data sampled at 1kHz in seconds


For the same sampling rate, but displayed in milliseconds, the multiplier would be calculated as follows:

Multiplier = 1000 / 1000 = 1

Waveform Graph 2

Figure 2 – graph displaying data sampled at 1kHz in milliseconds


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