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30 Cards in this Set
- Front
- Back
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What are Oscilloscopes 3 Applications? |
Harmonics Ground Faults Intrumentation Signals |
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What is a Transducer? |
TBD |
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What is a clamp on anmeters lower limit? |
100mA |
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The module mentions which three Semiconductors (tetravalent) |
Silicon Germanium Gallium Arsenide |
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What term is used for a pure semiconductor material with a crystal lattice structure? |
Intrinsic |
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What is the process that creates the crystal lattice? |
Covalent Bonding: when each atom shares its valence electrons with adjoining atoms |
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What is the doping atom ratio of impurity to intrinsic material? |
1 - 12 000 000 |
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What is the name of a doped intrinsic material |
Extrinsic |
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What is added to make a N-Type material |
Pentavalent material |
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What 3 materials in the module are mentioned as pentavalent? |
Arsenic Phosphorus Antimony |
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What 3 material does the module mention as Trivalent? |
Boron Aluminum Indium |
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With P-type material, which way do the electrons tend to move when voltage is applied? |
Towards the positive (Same as N-Type) The hole flow, therefore, is towards the negative |
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What is considered the majority charge carrier in P-Type Material? |
The Holes |
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What is considered the majority charge carrier in N-Type Material? |
The Electrons |
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What is two names for photoconductive semiconductor cells? |
Light Dependant Resistors (LDR) Photo Resistors |
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Define the property of Photoconduction |
A material that exhibits lower resistance when exposed to light, due to light breaking the electrons covalent bonds |
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What is dark current? |
The small amount of current flowing through the photocell due to ambient heat energy. |
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Which lead goes the P-Type, and which goes to the N-Type in a diode? |
Anode to P. Cathode to N. |
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What is the barrier potential for: Silicon Germanium |
.7 for Silicon .3 for Germanium |
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Describe an Axial Type Diode |
Low Current - Small, up to 5A - Cothode end is usually marked, with a silver line - only diode style that doesnt need a additional heat sink |
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Describe medium Diode |
Stud or press mount Up to 600A Usually used in Rectifiers Often marked with polarity |
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What is often used as the heat sink material |
Aluminum |
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Describe High current Diodes |
May or may not be marked with polarity Are tightly squeezed between two plates, which also act as heat sinks Rely on proper clamping force for continuity and heat transfer |
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What are the 4 most important electrical ratings of a diode? |
- Max forward current (If (max)) - Maximum forward surge current - Repetitive Reverse Maximum Voltage - Forward V drop at Rated Current (1V for silicon, not 0.7V) If the diode is a fast recovery, it must be replaced with another diode of the same Trr rating (the time it takes for a diode to change from off and on states) |
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How much current does a multimeter look for when Testing diodes? |
.5 mA |
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What are the 3 types of diodes |
Freewheeling Directional Rectifier |
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How is a photo diode installed |
In reverse bias. So when light is applied, resistance drops and allows current to flow |
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When electrons move across a PN junction, they release energy. Silicon and Germanium release mainly infrared wavelengths senses as heat. What materials are used in LEDs? |
Germanium Arsenic Phosphate (Red/Yellow) Gallium Phosphate (Red/Green) |
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What are the typical energy ratings of LEDs |
1.8 -2.2 V 15 - 30 ma 80 - 100 mW |
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What do oscilloscope current probes do? |
They convert the current into a representative voltage and display as a waveform |
