Introduction This chapter provides information to help you find defective components in an Agilent laser measurement system when a problem occurs. It can help determine whether the problem source is in the system electronics, environmental sensor, laser head, receiver, or the optics. Component-level troubleshooting and calibration should be performed by Agilent Technologies technicians only. However, component-level troubleshooting and calibration information is provided for selected assemblies. This chapter is structured as indicated in Table11-1.