The monthly “Flea at MIT” swapfest is where you go to find electronics long forgotten but still working, usually.
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The difference between CCD and microbolometer thermal imaging
Most engineers are familiar with charge-coupled devices (CCDs) employed as image sensors. Pixels in a CCD sensor consist of P-doped metal-oxide semiconductor capacitors arranged in columns and rows to form an array. Light striking each pixel is converted to an electrical charge that varies according to the light intensity at that pixel. The CCD transfers […]
Review: Using the Fluke 438-II motor analyzer
Fluke has come out with another superb electrical measuring instrument. It is the Fluke 438-II Motor Analyzer. Owners of the previous Fluke 435-II Power Quality Analyzer can download an upgrade that will add Motor Analyzer functions to their existing equipment. Full documentation including specifications and owner’s manuals for both of these members of the oscilloscope […]
Three-phase testing basics – Mitigating harmonic current
An electrical conductor warms up when it conveys current. If the heat is high enough the conductor can be damaged, so it is beneficial to limit current flow. Three-phase electrical distribution systems are highly effective in limiting current flow without reducing the amount of power delivered to the load. They do this by separating phases […]
Blood oxygen meters, Part 2: IC implementations
It is now trivial and non-invasive to measure blood-oxygen saturation SpO2, thanks to LEDs, algorithms, and ICs for pulse oximetry — it’s a very long way from having to draw blood and send it out for assessment. Part 1 of this FAQ discussed the principle of the non-invasive, light-based pulse-oximetry systems for reading blood-oxygen saturation […]
Low-cost alternative USB-to-GPIB controller
By languer, Electro-Tech-Online community member I was pressed to find a solution for a test automation need that needed to be simple and inexpensive. This led me to research for an inexpensive GPIB controller I could interface via USB and would allow me to control test equipment with. I planned to control the test equipment […]
Cabling certification system now supports Legrand Clarity, Superior Essex PowerWise PoE products
The Fluke Networks Versiv Cabling Certification System now supports Legrand’s family of Clarity cords and high-density jacks and Superior Essex Communications’ LP PowerWise cabling products. The combined PowerWise and Clarity system is designed to provide superior performance for power over Ethernet (PoE), including the IEEE 802.3bt draft 3.0 standard. This new capability extends Fluke Networks […]
Handy test equipment for troubleshooting
Not all test equipment needs to be expensive. Here are a few helpful tools that won’t break the bank. Electricians doing residential, commercial or industrial work need to know with absolute certainty whether a wire or terminal is live and whether a given piece of electrical equipment is energized at the power input terminals. Usually, […]
VIDEO: Capacitance Measurements Using Various Test Instruments
Capacitance is measured using a multimeter, LCR meter and oscilloscope. Ordinarily, capacitors are provided with the metrics – capacitance and working volts – printed or color-coded on the component. The capacitance as labeled is generally accurate to a reasonable tolerance. For most applications a wide range of values will perform as expected. As for working […]
VIDEO: Using a Fluke Bench-Type Multimeter to Measure DC Output from a Tektronix Programmable Power supply
We connect a Fluke 8808A bench-type multimeter to a Tektronix PWS4305 DC power supply and test both instruments for accuracy. Hello once more and welcome to our 58th Test and Measurement Video. This is Part 2 of a discussion begun in Video 57 in which we demonstrated some interesting aspects of the amazing Fluke 8808A […]
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