Metallurgical OES Calibration Spark OES Generator Calibration and Verification for Metallurgical Analysis Spark OES generator verification should connect electrical source behaviour with analytical evidence from the complete metallurgical measurement system. Key point Electrical generator verification and analytical OES verification answer different questions. Use the applicable OEM procedure, laboratory procedure, CRM information and controlled acceptance criteria for final decisions. Contents The measurement chain What the generator does Calibration and verification Post-repair verification Metallurgical evidence Return-to-service decision Start with the complete measurement chain A spark optical emission spectrometer does not measure alloy chemistry directly from the electrical output of its generator. The generator initiates and controls an electrical discharge at the sample. That discharge produces the plasma used to ablate, atomize and excite material. The opti...