This is an old document written two years ago that I intended to modify to include more calibration tests that I have done since. Since it seems unlikely that I will have the time to do that, I decided to post it as is. These calibration tests were done using the test data we acquired in August 1997. Since then I have done Monte Carlo tests to establish the accuracy of the plane/wire alignment code. These tests have shown that tansverse plane positions can be established to within 10 microns. Unfortunately, I only have a hardware copy of these plots, so I can't post them! Maher