To take a 2-wire resistance measurement with a benchtop multimeter, select the “ohm” or “Ω” mode, and connect the probes to the “INPUT HI” and “INPUT LO” ports. Ensure the circuit ...

The first method places the multimeter in series with the circuit. This method, though not often used, can be of value when troubleshooting or calibrating low-amperage circuits. Such meter functions ...

Watch for DMM loading in electronic circuits. DMMs have high input impedance when set to voltage, ... Imagine placing a couple of AA batteries across an energized 120V, 240V, or even a 480V circuit.

Building the circuit is very simple. It must be built in such a way that it will work up to 30 MHz. To do that, follow these guidelines: connect the input to a 50 Ω line; make the circuit wiring as ...

You can just measure the input voltage and the output voltage and use one of the basic equations to calculate the value of the capacitance or inductance, but a ratio close to 2-to-1 is a good choice.

[Thomas] picked up a Marconi TF1245 with dents and dings. We have to admit that we had not heard of a “circuit magnification meter,” but apparently, this was a thing in the late 1960s a… ...

Some amplifiers will trip out because of the open circuit, some will not. The math is easy enough. That being said, most standard audio gear has rail voltages of around 50-75V.

For circuits that are not powered at the moment, you can remove the fuse from the fuse holder and test the fuse with your meter’s ohmmeter function. You should get a reading when you place your ...

Input Protection plus Common-Mode Distortion. Now, suppose we need an input buffer with overvoltage protection and we’re not free to use premium, low-capacitance devices, perhaps for reasons of ...

Most circuit breakers have similar internal structures, which makes the technique broadly applicable. There are two types in the US, according to the Lab: bimetallic thermal and solenoid magnetic. The ...