Safety must always remain priority number one when doing measurements with multimeters. Working safely, while making electrical measurements, is not rocket science. It’s a simple combination of careful planning, safe practices and using the right tools in the right way. The more voltage and current is present in the circuit, more careful you have to →
Secret world of oscilloscope probles article written by Doug Ford and published by Silicon Chip magazine, describes how high frequency oscilloscope probes really work. Most textbooks treat scope probes as a combination of a resistive divider in combination with capacitors to provide an extended frequency response. But as will be revealed, the reality is that →
Multilayer ceramic capacitors (MLCs) have become one of the most widely used components in the manufacture of surface mount assemblies, and are inherently very reliable. But because they are made of ceramics that is brittle, these normally trustworthy devices can fail unexpectedly if they are not handled right in the electronics layout design and manufacturing. →
Some people love tweaking their equipment. Quite often some tweaking does not really change anything you hear, and sometimes there might be noticeable change, but not always for the better. Most of the time, second-guessing a piece of equipment’s designer component choices results worse than original performance. There are cases where tweaking can have difference, →
EEVblog #60 – Fluke 117 Multimeter Review and Teardown is an interesting review video on a Fluke multimeter. If you are looking for cheaper multimeters check $50 Multimeter Shootout from the same source. You should also look Why cheap multimeters suck. →
Star-quad design is sometimes quite a bit of talked about cable type. When I saw Star-Quad Cables and Double-Blind Testing posting at Controlgeek blog I decided that it would be a good idea to write something about them. Several companies use a quad configuration in their balanced cables instead of a twisted pair; Canare calls →
Grounding Complications is a very informative 28 slide set from PowerCET. It worth to read for everybody working with ground loops and electrical wiring. The slide set concentrates on following issues: Sensitive Equipment, Isolated grounding and Supplemental grounds. The slide set tells about wiring practices in use in USA, but there are also general information →
Everybody seems to be saying that you can’t charge Apple devices with normal USB power supplies. You need a special power supply from Apple or approved by Apple. I saw this kind of discussion at slashdot some time ago. Usually, device makers need to sign a confidentially agreement with Apple if they want to say →
Allen Avionics Audio Isolation Transformers page describes the typical ground loop problem situation with the following drawing: If you want to do the ground loop elimination in audio path, you have to cut the galvanic connection but pass the whole audio range. The simplest and most common way to do the isolation is use audio →
The monkeys got my multimeter article has an interesting video that shows a really crappy design aspect of this IDEAL multimeter. Was this caused by a design or specification problem is hard to say. Very probably, for an economy DMM like this one, the ability to operate the buttons without rear support (i.e. your own →