Measurement of earth loop impedance and determining the Prospective Fault Current (PFC) are critical for safety and form integral parts of the International Electrotechnical Commission (IEC) guidelines like standard IEC 60364 (and its various national equivalent standards). The prospective short circuit current (PSCC) or available fault current or short circuit making current is the highest →
A light meter is a device used to measure the amount of light. In photography, a light meter is often used to determine the proper exposure for a photograph. They are also used in cinematography and scenic design and lighting design todetermine the optimum light levels. Photographers working with controlled lighting and cinematographers use handheld →
Due real Fluorescent lamp fire danger I have pretty much tried to get rid of potentially dangerous tradtional starters in the fuorescent lamps. So I replaced the starter with electronic safety model – if bulb does not start, it will stay off without heating. Or at least should. I got one Axxel S10 starter that →
Mastech MS8209 is real multimeter that can measure almost anything. I have written some comments on Mastech MS8209 years ago. Some technical data on the back of the multimeter. The things I liked: – practically all the necessary multimeter measurements including frequency and capacitance measurements – good mechanical consruction, convient size and durable – the →
Few days ago I tested AD9850 DDS module in home in hope to some day have a working signal generator using it. The initial tests went well, so I could plan the next step. I was already doing some information searching to make decision if I should do the controlling using web interface (with Ethernet →
For some RF tests I sometimes need to generate different higher frequency signals than normally available from general purpose function generator. For this purpose I bought a cheap AD9850 module to generate different frequency RF signals. This AD9850 module can generate frequencies in 0-40 MHz frequency range (sine wave output). For initial testing I successfully →
A current transformer (CT) is used for measurement of alternating electric currents. The most common design of CT consists of a length of wire wrapped many times around a silicon steel ring passed ‘around’ the circuit being measured. Current transformers are used extensively for measuring current and monitoring the operation of the power grid. The →
EDN magazine has a very good article series on audio electronics related to ground loop issues (issue I have written myself in this blog and my ground loop documents). The article series is based on material that has originally appeared in Linear Audio, a book-format audio magazine published half-yearly by Jan Didden. The G word: →
Have you ever wondered how stable voltage your USB power source gives and how much current does your device take (your mobile phone charging or own circuit? 0.28″ LED 3-Digit Red Display USB Power Charger Data Transmit Current Voltage Tester (3~10V/0~3A) is a product that can do that. It shows the charging voltage and current →
Nowadays the most commonly used microphone types that need power from microphone connector are PC sound card microphones (3.5 mm plug) and Phantom powered professional microphones (XLR connector). Those two microphones are not compatible with each other, but there are cases where you might want to interchange them. In this posting I will describe how →