Laser Trimming in Singapore

 Laser trimming is the producing system of the use of a laser to adjust the operating parameters of an electronic circuit. Laser-trimmed precision thin-film resistor network from fluke, used inside the keithley dmm7510 multimeter. Ceramic sponsored with glass airtight seal cover. Laser trim marks are seen in the gray resistive materialone of the maximum not unusual applications makes use of a laser to burn away small quantities of resistors, raising laser trimming in singapore their resistance value. The burning operation may be performed at the same time as the circuit is being examined through automatic take a look at device, leading to most laser trimming in singapore appropriate very last values for the resistor(s) inside the circuit. 




The resistance cost of a movie resistor is defined by its geometric dimensions (duration, width, height) and the resistor cloth. A lateral cut within the resistor material via the laser narrows or lengthens the present day flow route and will increase the resistance value. The equal impact is obtained whether or not the laser modifications a thick-movie or a skinny-film resistor on a ceramic substrate or an smd-resistor on a smd circuit. The smd-resistor is produced with the equal era and may be laser trimmed as nicely. Trimmable chip capacitors are constructed up as multilayer plate capacitors. Vaporizing the pinnacle layer with a laser decreases the capacitance with the aid of lowering the region of the top electrode. 


Passive trim is the adjustment of a resistor to a given cost. If the trimming adjusts the complete circuit output together with output voltage, frequency, or switching threshold, that is referred to as lively trim. At some stage in the trim manner, the corresponding parameter is measured constantly and as compared to the programmed nominal price. The laser stops routinely whilst the price reaches the nominal fee. Often designers use potentiometers, that are adjusted throughout end checking out until the preferred characteristic of the circuit is reached. In many programs, the stop consumer of the product might prefer now not to have potentiometers, as they could float, be mis-adjusted or broaden noise. 


Consequently, producers determine the wanted resistance or capacitance values through dimension and calculation strategies and afterwards solder the appropriate element into the very last pcb; this method is known as "pick out on test" (sot) and is pretty exertions-intensive. It is less difficult to alternative the potentiometer or the sot component with a trimmable chip resistor or chip capacitor, and the potentiometer adjusting screwdriver is replaced by the laser trimming. The carried out accuracy may be better, the manner can be automated, and the long-term stability is higher than with potentiometers and at least as right as with sot components. Often the laser for active trimming can be integrated in current measurement systems via the manufacturer. Read More

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