Anyone who utilizes a goniophotometer has most likely encountered a question at some point similar to "How do you verify the angles specified are achieved by the goniophotometer?"
Sapphire Technical Solutions has developed a method of verifying actual goniophotometer positioning using N.I.S.T. traceable, ISO/IEC 17025 calibrated equipment. A representative of STS will travel to your facility and, using the goniophotometer equipment operating system, the goniophotometer will be driven to predetermined setpoints, then the actual position achieved will be measured very precisely. STS will then provide you with an ISO/IEC 17025 accredited calibration certificate.