Alloys of zinc and magnesium sport a wide range of physical and mechanical properties. The result is enormous flexibility in selecting die-casting materials for small, complex components. Designers have a broad latitude of materials to choose from for small die-cast components. Each of five zinc alloys, plus a magnesium option has strengths and weaknesses for particular applications. But as die-casting mediums, they have an advantage over materials such as aluminum. Their dimensional stability and predictable shrinkage rates ensure part-to-part consistency while low thermal mass permits high cycle rates. And designers often see a tenfold increase in die life thanks to the low abrasive wear rates of these alloys when compared to their aluminum counterparts. Special die-casting techniques let designers easily modify designs to boost structural properties. To improve creep resistance in a component with external or internal threads, for example, designers can increase thread count. Special hot-camber die-casting processes produce 360* external threads cast up to 50 threads/in. (20 threads/cm). Die casting lets the parts meet a thread tolerance class of 2A (6g) with no secondary deburring or chasing. Similarly, uniform wall thicknesses in a design distribute stresses more evenly. And precision tooling used in hot-chamber die casting helps eliminate secondary finishing or machining -- net-shape parts exit the mold "flash-free." Net-shape manufacturing is one of the main advantages of this die-casting method as it reduces material waste and part cost. The most common zinc alloys for hot-chamber die casting are Zamak 2, Zamak 3, Zamak 5, ZA-8, and ACuZinc. Overall, their mechanical properties compare favorably with brass and screw-machined steel. Zamak 3 is the most widely used zinc alloy. It offers the best combination of mechanical properties and economics. Zamak 2 and 5, with higher copper content, better resist wear. In addition, Zamak 5 offers higher creep resistance, while Zamak
RF attenuators are circuits that reduce the power level of a signal by a certain amount (gain), with little or no reflection. They reduce the output signal with respect to the input and measure the power reduction in decibels (dB).
Calibration instruments use electrical signals or physical quantities to calibrate sensors and meters. Devices that produce electrical signals can serve as precise meters for sensor calibration, or send output signals to other devices.
Fiber optic attenuators are devices that reduce signal power in fiber optic links by inducing a fixed or variable loss. They are used to control the power level of optical signals at the outputs of light sources and electrical-to-optical (E/O) converters. They are also used to test the linearity and dynamic range of photo sensors and photo detectors.
Dissolved CO2 instruments are analytical devices that measure the amount of carbon dioxide (CO2) dissolved in a liquid sample such as water. They typically include a submerged probe that is covered by a thin organic membrane.
The new 50P-1857, programmable attenuator from JFW Industries, offers solid-state reliability and superior broadband performance. With an operating frequency range of 200 to 6000 MHz, it is ideal for...
The term attenuate means to lessen the value of something. In RF and microwaves, attenuation is the lessening of the signal. Attenuating a signal in an electronic circuit is a matter...