Q. I installed a dimmer switch in my dining room and now the chandelier only works half the time. There are two switches in the room that control the light. They worked fine before I started the job.

Q: My wife wanted me to install a dimmer switch in our dining room — and now the chandelier works only half the time. Two switches in the room control the light. Since I tried to install the dimmer, ...

Keithley Instruments has added the Model 3731 6×16 switch-matrix plug-in card to its Series 3700 switch/multimeter family. The company says that the card's voltage and current characteristics (200 V, ...