Instrumentation Systems
... An analogue signal can have any voltage value, limited only, usually, by the voltages of the power rails. Some devices have a resistance which responds to changes in their surroundings. For example, a LDR (Light Dependent Resistor) has a resistance which decreases when more light falls on it. There ...
... An analogue signal can have any voltage value, limited only, usually, by the voltages of the power rails. Some devices have a resistance which responds to changes in their surroundings. For example, a LDR (Light Dependent Resistor) has a resistance which decreases when more light falls on it. There ...
SIVA INSTRUMENTS Loss Factor Meter
... The measurement is done at AC voltage between 150 V and 11 KV, 50 Hz. The instrument measures the Loss Factor as low as 0.0002 and the indication is directly given on the Digital Panel Meter. The capacitance range is 0.1 mfd to 1000 mfd. The capacitors can be checked at the rate of 200 per hour. Iso ...
... The measurement is done at AC voltage between 150 V and 11 KV, 50 Hz. The instrument measures the Loss Factor as low as 0.0002 and the indication is directly given on the Digital Panel Meter. The capacitance range is 0.1 mfd to 1000 mfd. The capacitors can be checked at the rate of 200 per hour. Iso ...
Resistance and Ohm`s Law
... Also the resistance of a metal ______________ with ___________________. At_____________ temperatures the atoms move around more ______________ and get in the way of flowing electric charges. Materials that have essentially zero resistance at very low temperatures are called ______________________. T ...
... Also the resistance of a metal ______________ with ___________________. At_____________ temperatures the atoms move around more ______________ and get in the way of flowing electric charges. Materials that have essentially zero resistance at very low temperatures are called ______________________. T ...
ElectronicsPrimer
... HB Implementation • HB uses two copies of H-bridge driver, either SGS-Thomson L293D or TI SN754410 - chips accept digital logic signals as input and drive motors directly on their outputs • Each triangular driver replaces one “leg,” or two transistors, in the H-bridge circuits. Each driver may be ei ...
... HB Implementation • HB uses two copies of H-bridge driver, either SGS-Thomson L293D or TI SN754410 - chips accept digital logic signals as input and drive motors directly on their outputs • Each triangular driver replaces one “leg,” or two transistors, in the H-bridge circuits. Each driver may be ei ...
AH979H
... ■ General The AH979H is a combination distortion meter and audio oscillator. The distortion measurement frequency is ganged automatically to the oscillator frequency. Voltage, Level, and Noise meter function also provided. This instrument is most suitable for testing instrument for maintenance and a ...
... ■ General The AH979H is a combination distortion meter and audio oscillator. The distortion measurement frequency is ganged automatically to the oscillator frequency. Voltage, Level, and Noise meter function also provided. This instrument is most suitable for testing instrument for maintenance and a ...
Exploring Series and Parallel Circuits
... • Devices in series are dependent upon each other to operate properly. • The total resistance in a circuit is equal to the sum of the individual resistances along the current path. RT = R1 + R2 + R3 etc. • The potential difference, or voltage, is decreased over each resistance. The voltage drop acro ...
... • Devices in series are dependent upon each other to operate properly. • The total resistance in a circuit is equal to the sum of the individual resistances along the current path. RT = R1 + R2 + R3 etc. • The potential difference, or voltage, is decreased over each resistance. The voltage drop acro ...
MIC79110 - Microchip
... current slowly decreases. End of charge is reached when the current is less than 3% of the rated current. A third stage will occasionally top off with charge with constant voltage charge if the battery voltage drops below a certain threshold. ...
... current slowly decreases. End of charge is reached when the current is less than 3% of the rated current. A third stage will occasionally top off with charge with constant voltage charge if the battery voltage drops below a certain threshold. ...
Monday, Nov. 21, 2005
... • We determine the total impedance Z of the circuit defined by the relationship Vrms I rms Z or V0 I 0 Z • From Pythagorean theorem, we obtain V0 VR20 VL0 VC 0 2 I 02 R2 I 02 X L X C 2 I 0 R 2 X L X C 2 I 0 Z ...
... • We determine the total impedance Z of the circuit defined by the relationship Vrms I rms Z or V0 I 0 Z • From Pythagorean theorem, we obtain V0 VR20 VL0 VC 0 2 I 02 R2 I 02 X L X C 2 I 0 R 2 X L X C 2 I 0 Z ...
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.