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Catalog - All Pages | Nexxus Lighting
Catalog - All Pages | Nexxus Lighting

... SaVi Safety Step ...
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Analysis of Jitter due to Power-Supply Noise in

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... series of power controllers which are rated from 15 through 1200 amperes. Addition technical specifications can be found later in Table 1-1 on page 1-5. The 1PCI is a single-phase, phase-fired power controller, and can operate with a wide variety of input signals and line voltages. The 1PCI's RMS ou ...
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... > 9040 units shipped from the factory for 230 VAC input will have a 72771-01, 0.5 amp front panel fuse installed. If the other input is required, it is recommended that the fuse be changed in order to keep the same level of protection. Both fuses are shipped with 9040 High Voltage Power Supplies. ...
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... current density at T = 0. The superconductor is more sensitive to external perturbation 共such as an applied current J兲 near Tc because J0共T兲 goes to zero there. A finite transition temperature width ⌬T, cutoff screening length scale, and finite J0共Tc兲 are used to smear out the divergence of the nonl ...
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... Analog Input, Differential Input: With the analog differential input, both input pins of the A/D converter can swing the full range, and typically change in a balanced fashion—that is, as one input goes up, the other goes down in a corresponding way. The differential input offers the advantage of su ...
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... If remote sensing is not required, the SENSE pin must be connected to the Vout pin (Pin 4) to ensure the converter will regulate at the specified output voltage. If these connections are not made, the converter will deliver an output voltage that is slightly higher than the specified value. Because ...
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on filter

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Resistive opto-isolator



Resistive opto-isolator (RO), also called photoresistive opto-isolator, vactrol (after a genericized trademark introduced by Vactec, Inc. in the 1960s), analog opto-isolator or lamp-coupled photocell, is an optoelectronic device consisting of a source and detector of light, which are optically coupled and electrically isolated from each other. The light source is usually a light-emitting diode (LED), a miniature incandescent lamp, or sometimes a neon lamp, whereas the detector is a semiconductor-based photoresistor made of cadmium selenide (CdSe) or cadmium sulfide (CdS). The source and detector are coupled through a transparent glue or through the air.Electrically, RO is a resistance controlled by the current flowing through the light source. In the dark state, the resistance typically exceeds a few MOhm; when illuminated, it decreases as the inverse of the light intensity. In contrast to the photodiode and phototransistor, the photoresistor can operate in both the AC and DC circuits and have a voltage of several hundred volts across it. The harmonic distortions of the output current by the RO are typically within 0.1% at voltages below 0.5 V.RO is the first and the slowest opto-isolator: its switching time exceeds 1 ms, and for the lamp-based models can reach hundreds of milliseconds. Parasitic capacitance limits the frequency range of the photoresistor by ultrasonic frequencies. Cadmium-based photoresistors exhibit a ""memory effect"": their resistance depends on the illumination history; it also drifts during the illumination and stabilizes within hours, or even weeks for high-sensitivity models. Heating induces irreversible degradation of ROs, whereas cooling to below −25 °C dramatically increases the response time. Therefore, ROs were mostly replaced in the 1970s by the faster and more stable photodiodes and photoresistors. ROs are still used in some sound equipment, guitar amplifiers and analog synthesizers owing to their good electrical isolation, low signal distortion and ease of circuit design.
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