Multiplot charts with units

[PghFool]

I'd like to make a chart using units on the vertical axis.  I'd like to plot temperature on the left axis, and something else, like pressure, on the right axis.  I would like to incorporate units, so I can easily switch between metric and Imperial units.

I can build a single plot with units and assign it to the value of the chart easily enough.  Changing the units on that y axis  changes the display appropriately, as in the enabled case of the enclosed VI.  However, if I build a second plot with different units in the second parameter and try to build an array with the two of them, I get broken wires because the units aren't compatible.  Is there a way to assign my second plot to the second axis and avoid the broken wires?  I attempted using two methods for creating a multiplot chart, and neither seemed to work.  They are in the disable cases.

I am using 32 bit  LV2019 on a Windows 7 machine.

[GerdW · Accepted solution]

Hi PghFool,

you cannot mix different incompatible units in an array: all elements share the same properties!

So my suggestion is to handle the unit conversion on your own and indicate the currently used unit in the plot/axis label…

[PghFool]

So there's no way to assign the values of one plot to one Y axis, and the values of a second plot to a second axis?  I didn't see a way, but I was hoping, because there are a lot of properties to a chart and its various components.

[GerdW]

Hi PghFool,

the chart properties doesn't matter.

Its the BuildArray which gives the error: you cannot build an array from elements of different datatype!

[PghFool]

I understand I can't build an array from different dataypes.  I was hoping to build two different arrays, and assign them the the "Value" of different active Y axes, but there's no such property.  I will accept your solution of using Convert Unit before building the array to get rid of the units.  I can display with different units by switching which Convert Unit I use, thus avoiding any of my own math.