Electrical Motor Starters
... therefore be unsuitable for star-delta starting. The starting conditions depend on the position of the tapping on the transformer winding, i.e. on the secondary voltage. Usually three or more tappings are provided so that there is a choice of starting conditions such as 40, 60 or 75% of line voltage ...
... therefore be unsuitable for star-delta starting. The starting conditions depend on the position of the tapping on the transformer winding, i.e. on the secondary voltage. Usually three or more tappings are provided so that there is a choice of starting conditions such as 40, 60 or 75% of line voltage ...
Understanding Daylight Simulation - X
... The stability of a lamp whether it is a fluorescent or tungsten lamp is the function of the current supplied to the lamp. In fluorescent fixtures, the use of a ballast or commonly known as a constant wattage auto transformer, is required to start the lamps at voltages in excess of 800 volts. Once th ...
... The stability of a lamp whether it is a fluorescent or tungsten lamp is the function of the current supplied to the lamp. In fluorescent fixtures, the use of a ballast or commonly known as a constant wattage auto transformer, is required to start the lamps at voltages in excess of 800 volts. Once th ...
O A RIGINAL
... The purpose of this project is to design and develop a device to measure CATV video signals. The device is used to display the image signal received from fiber-to-the-home (FTTH) system whereas the image signal is transmitted to the user from the centralized television cable location or satellite. T ...
... The purpose of this project is to design and develop a device to measure CATV video signals. The device is used to display the image signal received from fiber-to-the-home (FTTH) system whereas the image signal is transmitted to the user from the centralized television cable location or satellite. T ...
3-0369 HiTest Arrester Brochure
... when connected to the top and bottom of the arrester, enables the user to increase the DC voltage that is being applied to the arrester. The user can then measure the exact voltage at which the arrester conducts. The unit will display both the maximum voltage an arrester will support at full conduct ...
... when connected to the top and bottom of the arrester, enables the user to increase the DC voltage that is being applied to the arrester. The user can then measure the exact voltage at which the arrester conducts. The unit will display both the maximum voltage an arrester will support at full conduct ...
Undercover Warning Signal - Elektro
... Hide-A-LEDs and BULL LEDs can be synchronized, any combination, up to a total of 20 heads The LEDs are Next Generation; Nova utilizes the latest technology available from the world’s top LED manufacturers Pre-wired with a 9 foot cable UV stabilized polycarbonate lens Nickel plated housing Low profil ...
... Hide-A-LEDs and BULL LEDs can be synchronized, any combination, up to a total of 20 heads The LEDs are Next Generation; Nova utilizes the latest technology available from the world’s top LED manufacturers Pre-wired with a 9 foot cable UV stabilized polycarbonate lens Nickel plated housing Low profil ...
CAD-280SA V-12R Manual
... Flip the power switch to the “On” position and then flip the standby switch to the “Operate” position. Observe that all 16 vacuum tubes are lit, after a delay of 10-15 seconds. When the power tubes start to conduct, red ‘Good Health’ LED’s on the top panel will light up next to each one. This might ...
... Flip the power switch to the “On” position and then flip the standby switch to the “Operate” position. Observe that all 16 vacuum tubes are lit, after a delay of 10-15 seconds. When the power tubes start to conduct, red ‘Good Health’ LED’s on the top panel will light up next to each one. This might ...
Dynamic Processors
... The release time sets the amount of time it takes for the compressor to “let go” (or turn the signal back up) once it falls below the threshold. Release times can vary anywhere between 5/100 of a second to as slow as two or three seconds. Longer release times of one second or more tend to produce th ...
... The release time sets the amount of time it takes for the compressor to “let go” (or turn the signal back up) once it falls below the threshold. Release times can vary anywhere between 5/100 of a second to as slow as two or three seconds. Longer release times of one second or more tend to produce th ...
Chapter 4 (Resonance Circuit)
... At resonance, the impedance consists only resistive component R. The value of current will be maximum since the total impedance is minimum. The voltage and current are in phase. Maximum power occurs at resonance since the power factor is unity. ...
... At resonance, the impedance consists only resistive component R. The value of current will be maximum since the total impedance is minimum. The voltage and current are in phase. Maximum power occurs at resonance since the power factor is unity. ...
Power Sources
... Capacity - rated in A-hr or mA-hr for small cells Usually specified at the “ten-hour discharge rate” Example - an Energizer AA 1.5 V lithium cell rated 2900 mA-hr should deliver 290 mA for 10 hr before voltage falls below 1V But, will not last proportionally as long at higher currents LSU 11/05/2013 ...
... Capacity - rated in A-hr or mA-hr for small cells Usually specified at the “ten-hour discharge rate” Example - an Energizer AA 1.5 V lithium cell rated 2900 mA-hr should deliver 290 mA for 10 hr before voltage falls below 1V But, will not last proportionally as long at higher currents LSU 11/05/2013 ...
Power System Harmonics
... transformer subject to nonsinusoidal load current having more than 5% total harmonics distortion needs to be derated. However, when current THD is below 15%, the derating of the transformer would be so small that it can be neglected. On the other hand, when current THD exceeds 15%, the transformer c ...
... transformer subject to nonsinusoidal load current having more than 5% total harmonics distortion needs to be derated. However, when current THD is below 15%, the derating of the transformer would be so small that it can be neglected. On the other hand, when current THD exceeds 15%, the transformer c ...
DS 2008/001
... temperature under overload conditions shall be measured with a continuous current at least 1,7 times the fuse rating. Where items other than fuses are used as protective devices for temperature limitation, the equipment shall be tested to verify that the limiting temperature is not exceeded when tho ...
... temperature under overload conditions shall be measured with a continuous current at least 1,7 times the fuse rating. Where items other than fuses are used as protective devices for temperature limitation, the equipment shall be tested to verify that the limiting temperature is not exceeded when tho ...
TOP221 - Power Integrations
... pins is required to supply the gate drive current. The total amount of capacitance connected to this pin (CT) also sets the auto-restart timing as well as control loop compensation. VC is regulated in either of two modes of operation. Hysteretic regulation is used for initial start-up and overload o ...
... pins is required to supply the gate drive current. The total amount of capacitance connected to this pin (CT) also sets the auto-restart timing as well as control loop compensation. VC is regulated in either of two modes of operation. Hysteretic regulation is used for initial start-up and overload o ...
Datasheet - SHF Communication Technologies AG
... For permanent mounting remove the heat sink from the amplifier. In that case please ensure that adequate cooling of the amplifier is guaranteed. It is recommended to use thermal paste or a thermal gap pad for the mounting. In order to separate the heat sink from the amplifier, remove the four screws ...
... For permanent mounting remove the heat sink from the amplifier. In that case please ensure that adequate cooling of the amplifier is guaranteed. It is recommended to use thermal paste or a thermal gap pad for the mounting. In order to separate the heat sink from the amplifier, remove the four screws ...
Rechargeable Power Supply Manual
... capable of operating in any orientation and over a temperature range of -10 to 60C. A slide switch allows the User to configure the RPS-1 for 12 or 24VDC operation. Two User-programmable Power Supply outputs are available which can source 7 different regulated voltage levels from 3.5VDC to 22VDC. Ou ...
... capable of operating in any orientation and over a temperature range of -10 to 60C. A slide switch allows the User to configure the RPS-1 for 12 or 24VDC operation. Two User-programmable Power Supply outputs are available which can source 7 different regulated voltage levels from 3.5VDC to 22VDC. Ou ...
Ohm`s Law Lab
... 1. As the voltage potential across the resistor increased, the current through the resistor increased. If the change in current is proportional to the voltage, the data should be in a straight line and it should go through zero. In these two examples how close is the y-intercept to zero? Is there a ...
... 1. As the voltage potential across the resistor increased, the current through the resistor increased. If the change in current is proportional to the voltage, the data should be in a straight line and it should go through zero. In these two examples how close is the y-intercept to zero? Is there a ...
1. The fundamental current mirror with MOS transistors 2. The
... 15. Size the transistors in the mirror for a current gain equal to unity, a 30μA input current and VDSat =200mV for all devices. The sizing procedure takes into the account that all transistors, except Mn6, are biased in the saturation region. If the current gain is equal to unity, then the input an ...
... 15. Size the transistors in the mirror for a current gain equal to unity, a 30μA input current and VDSat =200mV for all devices. The sizing procedure takes into the account that all transistors, except Mn6, are biased in the saturation region. If the current gain is equal to unity, then the input an ...
EW lab manual - WordPress.com
... ACTIVE components increase the power of a signal and must be supplied with the signal and a source of power. Examples are bipolar transistors, field effect transistors etc. The signal is fed into one connection of the active device and the amplified version taken from another connection. In a transi ...
... ACTIVE components increase the power of a signal and must be supplied with the signal and a source of power. Examples are bipolar transistors, field effect transistors etc. The signal is fed into one connection of the active device and the amplified version taken from another connection. In a transi ...
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.