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RoadTests & Reviews

5 Posts authored by: neuromodulator
3.5 Capacitor Characterization  An ideal capacitor can be specified by a single value: its capacitance. Here I will show how I measured 2 capacitor non-idealities: the dielectric absorption and the dielectric leakage.  Dielectric absorption is an effect caused by the "alignment" and the "dealignment" of the molecular dipoles of the capacitor dielectric caused by the application of an electric field. While dielectric leakage is the current that crosses the capacitor dielectric and slow ...
3.4 LEDs 3.4.1 Steady state LED I-V curve variability 3.4.2 LED step-stress and I-V characterization     3.4 LEDs  Diodes are two-terminal electronic devices that facilitate current conduction in one direction and block it in the opposite direction. Their electrical characteristics can be described by the Shockley diode equation which defines the relationship between current and voltage across a diode:     Where: I is the diode current. Is is the reverse bia ...
3.3 DC-DC converter efficiency measurement   The use of DC-DC converters has become almost universal in modern electronics. One important factor that needs to be evaluated, especially when the power comes from a battery, is the DC-DC converter efficiency.   I decided to evaluate a MAX 17503 step-down DC-DC converter evaluation board efficiency at an 8 Ω load. The SMU was connected to the DC input of the converter, and a the Keithley DMM6500 to the output. By dividing the output ...
3.2 Battery Characterization   Battery selection for a specific application can depend on multiple factors: price, size, weight, safety and its electrical properties. Manufacturers are known for making dubious claims about their batteries lifetime and capacity, so the proper way to evaluate a battery is to characterize it.   Batteries are complex electrochemical devices that do not behave as constant voltage sources (Figure A). Their terminal voltage depends on the amount of charge in ...
3.1 Solar cell characterization (worflow comparison) 3.1.1 Front panel 3.1.2 Web remote control 3.1.3 KickStart 3.1.4 I-V tracer app 3.1.5 Remote control 3.1.6 Standalone script     3.1 Solar cell characterization (worflow comparison)  Solar or photovoltaic cells are devices that convert light energy directly into electricity. The shape of the solar cell I-V curve makes the maximization of the output power an important goal to maximize the efficiency of ...

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