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Laser trimming is the manufacturing process of using a laser to adjust the operating parameters of an electronic circuit. Laser-trimmed precision thin-film resistor network from Fluke, used in the Keithley DMM7510 multimeter. Ceramic backed with glass hermetic seal cover. Laser trim marks are visible in the grey resistive material.
The resistance of both thin and thick film resistors after manufacture is not highly accurate; they are usually trimmed to an accurate value by abrasive or laser trimming. Thin film resistors are usually specified with tolerances of 1% and 5%, and with temperature coefficients of 5 to 50 ppm/K .
With laser trimming two modes are used; either passive trimming, where each resistor is trimmed to a specific value and tolerance, or active trimming, where the feedback is used to adjust to a specific voltage, frequency or response by laser trimming the resistors on the circuit while powered up.
A: preset resistor, B: preset resistor (alternate), C: preset potentiometer, D preset potentiometer (alternate), E: preset inductor, F: preset capacitor In circuit diagrams, the symbol for a variable component is the symbol for a fixed component with a diagonal line through it terminating in an arrow head.
Amateur laser construction. See TEA laser. Carbon dioxide laser: 10.6 μm, (9.4 μm) Transverse (high-power) or longitudinal (low-power) electrical discharge Material processing (laser cutting, laser beam welding, etc.), surgery, dental laser, military lasers. Carbon monoxide laser: 2.6 to 4 μm, 4.8 to 8.3 μm Electrical discharge
Thermopile laser sensor; Thin film; Three-level laser; Ti:sapphire laser; Time-of-flight camera; Time-of-flight mass spectrometry; Time-resolved spectroscopy; Time of flight; Titan laser; Toda oscillator; Toner (printing) Toner cartridge; Toner refill; Tophat beam; Trabeculoplasty; Track and trace; Transistor laser; Transoral laser microsurgery ...
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