Why the color bar is always red?

[hejun8035]

I calculated the voltage drop according to the example, and I can get the voltage drop image, but the  color bar is always red. I deem that the color bar is rainbow. Where is my errors?

[nori]

It may depend on the graphic card( or driver) you use.
Could you confirm whether or not you get the same picture with a different computer?

[hejun8035]

I get the same picture with a different computer.

[Anders Blom]

This problem appears on some computers or rather combinations of graphics cards and drivers, but mostly it doesn't. Can you tell us which graphics card you are using, and which driver (and details of the OS too, please).