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Troubleshooting Fluorescent Lamp Ballasts
Troubleshooting Fluorescent Lamp Ballasts

... the figure below. If the lamp between the Red leads and Yellow leads is lit and the other lamp is out, look for a pinched Yellow lead. If the lamp between the Red and Yellow leads does not light and the other does, it is probably due to a short within the ballast. LAMP ...
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9HSTF MG*afj

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... Many things will be connected to ground! Once the DC voltage sources are turned off, you will find that the terminals of many devices are connected to ground. * Remember, all terminals connected to ground are also connected to each other! For example, if the emitter terminal is connected to ground, ...
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... he work deals with multiphase machines, which are electrical machines with a number of phases greater or equal than 3. These machines are nowadays quite common and a brief presentation of general multiphase machines theories are illustrated. Due to development ...
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... source, along with a sinusoidal generator at a frequency of 20kHz. The input signal level is approximately –1dBfs. The input is filtered with a 20kHz single pole RC filter shown in Figure 5. The FFT shown in the data sheet is a 16384-point FFT. A typical FFT obtained with DC1500A is shown in Figure 6. ...
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... shall bear no responsibility whatsoever for your use of any Product outside of the prescribed scope or not in accordance with the instruction manual. The Products are not designed or manufactured to be used with any equipment, device or system which requires an extremely high level of reliability th ...
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Solutions - University of California, Berkeley

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... For the dc analysis of an op-amp circuit, the Input terminals are grounded.  This should result in zero dc voltage at the output.  However, because the op amp has very large gain, the output voltage is close to either +VCC or –VEE.  To overcome this problem In the dc analysis, it will be assumed ...
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... The instinct of many teachers would be to use a relay for this interfacing. However this is an expensive, and complicated, way of achieving such a simple interfacing task. A Field Effect Transistor (FET) is much more appropriate in this situation, as it can be directly wired to the microcontroller o ...
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Sevcon Powerpak trouble shooting guide

... Minimum logic has 2 connectors, 1 for the vehicle/contactor connections and 1 for serial communications. The Medium I/O logic has 3 connectors, 1 for the vehicle connections, 1 for the contactor connections and 1 for serial communications. The High I/O logic also has 3 ...
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... 5000 VA XLJ models: To draw full 5000 VA from the UPS have a qualified electrician cut off the input plug and hardwire the UPS to the appropriate power panel. Turn on all connected equipment. To use the UPS as a master ON/OFF switch, ensure all connected equipment is switched ON. The equipment will ...
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... at the CHARGE MODE screen. However, as the voltage of the pack rises, current must be steadily reduced. Toward the end of the charge, voltage becomes nearly constant as 4.2V per cell is approached, and current is reduced to a trickle. This means that charging the last few mAh back into the pack take ...
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Fuseology
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... without first rising to a higher value. R.M.S. Current The R.M.S. (root-mean-square) value of any periodic current is equal to the value of the direct current which, flowing through a resistance, produces the same heating effect in the resistance as the periodic current does. Semiconductor Fuses Fus ...
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Switched-mode power supply



A switched-mode power supply (switching-mode power supply, switch-mode power supply, SMPS, or switcher) is an electronic power supply that incorporates a switching regulator to convert electrical power efficiently. Like other power supplies, an SMPS transfers power from a source, like mains power, to a load, such as a personal computer, while converting voltage and current characteristics. Unlike a linear power supply, the pass transistor of a switching-mode supply continually switches between low-dissipation, full-on and full-off states, and spends very little time in the high dissipation transitions, which minimizes wasted energy. Ideally, a switched-mode power supply dissipates no power. Voltage regulation is achieved by varying the ratio of on-to-off time. In contrast, a linear power supply regulates the output voltage by continually dissipating power in the pass transistor. This higher power conversion efficiency is an important advantage of a switched-mode power supply. Switched-mode power supplies may also be substantially smaller and lighter than a linear supply due to the smaller transformer size and weight.Switching regulators are used as replacements for linear regulators when higher efficiency, smaller size or lighter weight are required. They are, however, more complicated; their switching currents can cause electrical noise problems if not carefully suppressed, and simple designs may have a poor power factor.
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