EE 212 Passive AC Circuits
... The source impedance value (or the network impedance at the power system bus) can be obtained from the utility for all the sub-stations of a power grid. This is the Thevenin Impedance seen upstream from the sub-station bus. The Thevenin Voltage can be measured at the bus (usually the nominal or rate ...
... The source impedance value (or the network impedance at the power system bus) can be obtained from the utility for all the sub-stations of a power grid. This is the Thevenin Impedance seen upstream from the sub-station bus. The Thevenin Voltage can be measured at the bus (usually the nominal or rate ...
10. RLC Circuit
... 1. Note the following parameters for the solenoid used: L 63 mH , R 76 2 2. Connect the function generator in series with a variable resistor, a solenoid, and a variable capacitor. Connect also the CH1 input of the oscilloscope to measure the voltage from the generator. The circuit is shown ...
... 1. Note the following parameters for the solenoid used: L 63 mH , R 76 2 2. Connect the function generator in series with a variable resistor, a solenoid, and a variable capacitor. Connect also the CH1 input of the oscilloscope to measure the voltage from the generator. The circuit is shown ...
Transmission Fundamentals
... • With the horizontal axis in space, graphs display the value of a signal at a given point in time as a function of distance – At a particular instant of time, the intensity of the signal varies as a function of distance from the source ...
... • With the horizontal axis in space, graphs display the value of a signal at a given point in time as a function of distance – At a particular instant of time, the intensity of the signal varies as a function of distance from the source ...
Three Phase Circuit Analysis
... Electric power is supplied by three-phase generators. It is then transformed appropriately using transformers and transmitted in the form of three-phase power except at the lowest voltage levels of the distribution system where single phase power is used. There are two main reasons for using three-p ...
... Electric power is supplied by three-phase generators. It is then transformed appropriately using transformers and transmitted in the form of three-phase power except at the lowest voltage levels of the distribution system where single phase power is used. There are two main reasons for using three-p ...
8.2 Wave Interactions
... two dimensions through the drumhead, and the wave is reflected at the perimeter. Vibrating air columns in flutes, organ pipes, and other musical instruments are standing sound waves. Sound waves are reflected at the ends of each musical instrument. Laser light is produced from standing light waves. ...
... two dimensions through the drumhead, and the wave is reflected at the perimeter. Vibrating air columns in flutes, organ pipes, and other musical instruments are standing sound waves. Sound waves are reflected at the ends of each musical instrument. Laser light is produced from standing light waves. ...
Load-commutated Current Source Inverter (CSI)
... time, t off , should be more than the turn-off time of the thyristor, t q , for reliable operation. This means that there is an upper limit to the inverter frequency, beyond which the thyristors in the inverter circuit will fail to commutate. 2. When the inverter frequency ( f = 1 / T ) is low, or t ...
... time, t off , should be more than the turn-off time of the thyristor, t q , for reliable operation. This means that there is an upper limit to the inverter frequency, beyond which the thyristors in the inverter circuit will fail to commutate. 2. When the inverter frequency ( f = 1 / T ) is low, or t ...
Differential Impedance Measurement with Time Domain Reflectometry
... they represent a simple coplanar transmission line. The impedance of this transmission line depends on the line parameters of the capacitance and loop inductance per length. What will happen to the impedance a signal sees if the coplanar pair passes over a floating metal plane? To explore this scena ...
... they represent a simple coplanar transmission line. The impedance of this transmission line depends on the line parameters of the capacitance and loop inductance per length. What will happen to the impedance a signal sees if the coplanar pair passes over a floating metal plane? To explore this scena ...
Tech Exam Study Aid - effective July 1, 2010
... Which amateur band are you using when transmitting on 146.52 MHz? 2 meter band (2 = approximately 300/146.525) 2m band = 144 to 148MHz Which 70-centimeter frequency is authorized to a Technician class license holder operating in ITU Region 2? 443.350 MHz (70cm = approximately 300/443.350) 70cm band ...
... Which amateur band are you using when transmitting on 146.52 MHz? 2 meter band (2 = approximately 300/146.525) 2m band = 144 to 148MHz Which 70-centimeter frequency is authorized to a Technician class license holder operating in ITU Region 2? 443.350 MHz (70cm = approximately 300/443.350) 70cm band ...
Standing wave ratio
In radio engineering and telecommunications, standing wave ratio (SWR) is a measure of impedance matching of loads to the characteristic impedance of a transmission line or waveguide. Impedance mismatches result in standing waves along the transmission line, and SWR is defined as the ratio of the partial standing wave's amplitude at an antinode (maximum) to the amplitude at a node (minimum) along the line.The SWR is usually thought of in terms of the maximum and minimum AC voltages along the transmission line, thus called the voltage standing wave ratio or VSWR (sometimes pronounced ""viswar""). For example, the VSWR value 1.2:1 denotes an AC voltage due to standing waves along the transmission line reaching a peak value 1.2 times that of the minimum AC voltage along that line. The SWR can as well be defined as the ratio of the maximum amplitude to minimum amplitude of the transmission line's currents, electric field strength, or the magnetic field strength. Neglecting transmission line loss, these ratios are identical.The power standing wave ratio (PSWR) is defined as the square of the VSWR, however this terminology has no physical relation to actual powers involved in transmission.The SWR can be measured with an instrument called an SWR meter. Since SWR is defined relative to the transmission line's characteristic impedance, the SWR meter must be constructed for that impedance; in practice most transmission lines used in these applications are coaxial cables with an impedance of either 50 or 75 ohms. Checking the SWR is a standard procedure in a radio station, for instance, to verify impedance matching of the antenna to the transmission line (and transmitter). Unlike connecting an impedance analyzer (or ""impedance bridge"") directly to the antenna (or other load), the SWR does not measure the actual impedance of the load, but quantifies the magnitude of the impedance mismatch just performing a measurement on the transmitter side of the transmission line.