The standard method for doing this involves looking at a SMPTE color bar test pattern through a blue filter. This method has 2 drawbacks. First, at best it is an approximation of the correct setting. Second, and more importantly, for some displays it simply does NOT work. On some plasmas in particular I have noticed that this method will recommend a grossly inaccurate setting. Here's a foolproof method for setting Color/Tint that does not use filters.
Point the color analyzer or light meter towards the screen and display a 100% white test pattern.
Measure the Y value (luminance) of white.
Display a 100% Red test pattern, and measure the Y value here as well.
You will notice that as you move the Color control up and down, the Y value of Red increases and decreases, but white stays the same.
Set the color control at the point where Red measures closest to 21% of the white reading.
If you have not already done so, adjust the white balance and get it as close to neutral (x=0.3127, y=0.329) across the entire range.
Point the color analyzer towards the screen and display a cyan test pattern.
Put the Tint control at its neutral mid setting.
Use the software controls to plot cyan on a CIE chart.
Adjust Tint up or down until the reading places the hue of cyan as close to the target on the CIE chart as possible (it is useful if the software has a continuous reading mode, so you can see changes you make to Tint in real time).
If you had to substantially adjust Tint from the neutral point to get an accurate hue of cyan, then check the other secondaries. You may have to select another setting that gets all 3 secondaries as close to correct hues as possible.