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... carry you through the process of using the Digital Multimeter and a voltage source (a power supply) to measure voltage, current and resistance to verify Ohm’s Law (Lab 1) and to determine the behavior of resistors connected in series and parallel (Lab 2). The resistors you will use are physically cy ...
2SC0535T - Power Integrations
2SC0535T - Power Integrations

... The maximum peak gate current refers to the highest current level occurring during the product lifetime. It is an absolute value and does also apply for short pulses. The average supply input current is limited for thermal reasons. Higher values than specified by the absolute maximum rating are perm ...
Instrumentation Amp
Instrumentation Amp

Sample Final Draft. - Information Services and Technology
Sample Final Draft. - Information Services and Technology

... They have mirrored scales and larger meter movements are used to improve resolution; two and a half to three digits equivalent resolution is usual. Resistance measurements, in particular, are of low precision due to the typical resistance measurement circuit which compresses the scale heavily at the ...
Basic AC Drives
Basic AC Drives

... The MICROMASTER 440 is available in six frame sizes (A - F) and offers higher power ranges than the 420, with a corresponding increase in functionality. For example, the 440 has three output relays, two analog inputs, and six isolated digital inputs. The two analog inputs can also be programmed for ...
Auto-Zero Amplifiers
Auto-Zero Amplifiers

... A wide variety of electronic applications, especially those involving very small input signals, require signal paths with very low offset voltage and offset voltage drift over time and temperature. When standard linear components are used, the only way to achieve this low offset and drift is to use ...
LabSU2005_2 - University of Kentucky College of Engineering
LabSU2005_2 - University of Kentucky College of Engineering

... voltage was estimated from the transfer characteristic on the curve tracer. Use the diode function you developed in the prelab to fit the measured diode curve to the parametric on that Matlab produced. Treat the exponent factor as one value (i.e. fix one and let the other vary and report the product ...
Experiment 1: Description of a capacitor
Experiment 1: Description of a capacitor

ppt - ECE Users Pages
ppt - ECE Users Pages

... “The resistance seen to the right of any of the vertical 2R resistors is 2R.” ...
Chapter 1 Introduction to Electronics
Chapter 1 Introduction to Electronics

... electrical characteristics does not depend on the power supply Examples: Resistor, capacitor, inductor Active components: Do require/depend on power supply for its operation or the device which electrical characteristics depend on the power supply Examples: Transistors such as BJT and FET ...
DC Fundamentals, 6-3
DC Fundamentals, 6-3

... 1. Voltage and resistance are a. measured in the same unit. b. inversely proportional. c. directly proportional. d. smaller than circuit current. 2. An electric circuit with 500: a. 5 Vdc. b. 10 Vdc. c. 15 Vdc. d. 50 Vdc. 3. If the voltage and resistance in a circuit are both doubled, the current wi ...
Adding Squelch to the Soviet R107
Adding Squelch to the Soviet R107

... output, and would work from a negative 2.4 volt supply. Switching the audio Turning first to switching the audio, I figured that a relay would be required, as the audio here is at headphone level and any form of electronic switching would be too lossy. A relay would be required that would energise r ...
20150522-Supplementary material
20150522-Supplementary material

Basic electric Tools and Tackles
Basic electric Tools and Tackles

... In the following example of using the megohmmeter,the test is made at the point where power leaves a motor starter Establishing a good ground Before the test is actually begun, it is necessary to establish a good ground. This is done by connecting the black (negative) test lead to ground and then g ...
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FDS6961A Dual N-Channel Logic Level PowerTrench MOSFET

... Dual N-Channel Logic Level PowerTrenchTM MOSFET General Description ...
OP177 Ultraprecision Operational Amplifier
OP177 Ultraprecision Operational Amplifier

NCP1351LEDGEVB Universal Input, 20W, LED Ballast Evaluation Board User's Manual
NCP1351LEDGEVB Universal Input, 20W, LED Ballast Evaluation Board User's Manual

... CCM: ...
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1C.3.1—Voltage Balance

... If an electric supply system is operating near the upper or lower limits of the ANSI Std. C84.1 voltage ranges, each individual phase voltage should be within the listed limits. (These voltage ranges are listed in 1C.2.1, Voltage Level and Range, in this Handbook.) ...
PS Mods Individ EFB Bias ST-35
PS Mods Individ EFB Bias ST-35

... 400+ volt capacitors hold their high voltages for a long time after power is removed. A method of automatically discharging them is mandatory, but luckily, easy to implement, using bleeder resistors. Bleeder resistors really should be included on all high voltage tube circuits, but are notably absen ...
Simple Circuits and Kirchoff`s Rules
Simple Circuits and Kirchoff`s Rules

...  What it the total in a series circuit?  Start with of Vsource = Vsource =  Due to conservation of charge, ITotal = I1 = I2 = I3, we can factor out I such that Vsource = ...
MEASUREMENT OF DC AND AC VOLTAGE AND CURRENT
MEASUREMENT OF DC AND AC VOLTAGE AND CURRENT

Module P5 Student checklist
Module P5 Student checklist

V3IS00244-100_02-2013 Energy-400 e 3x130.indd
V3IS00244-100_02-2013 Energy-400 e 3x130.indd

... 2) For Energy-3x130 PWRi model only, the CT secondaries may be connected to earth 3) The instrument should be connected as shown in the panel B), in accordance with the CT current directions 4) If the error is to fall within the class limits of the instrument, it is necessary to use the curr ...
Primary switch mode power supply CP
Primary switch mode power supply CP

Thermocouples
Thermocouples

< 1 ... 1705 1706 1707 1708 1709 1710 1711 1712 1713 ... 2207 >

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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