Many single-phase motors used on refrigeration systems will incorporate some type of capacitor. They will either use a start capacitor or a run capacitor. Some motors will even use both.

Figure 2 illustrates a general circuit for testing capacitor leakage. Here, the voltage is placed across the capacitor (CX) for the soak period, then the ammeter measures the current after this period ...

Engineers usually have access to signal and function generators, as well as frequency counters and oscilloscopes, but they may not have access to capacitance or inductance meters. Using the test setup ...

[James] designed a set of circuit boards that enabled him to place different types of capacitors at various distances along a set of PCB traces.

Measurement of circuit's attenuation factor and generator's internal resistance leads to r c, the capacitor's ESR: Instead of using a sine wave excitation, we can use a square wave.

This simple circuit matches, compares, and even measures (within limits) capacitors (see the figure). It's very low in cost and small (just 25 by 50 by 100 mm).

Q. What is the minimum ampacity and minimum size conductor required for a circuit that connects a capacitor to the terminals of a 25 hp, 460VAC, 3-phase, air conditioner induction motor? The rated ...

Figure 1 This simple fixture first impresses a reference voltage across a capacitor under test and then measures the voltage drop versus time at the output of the voltage follower (a). The circuit ...

Longtime contributor Bob Meister from Hamden, Conn., writes in response to Tom Osenkowsky’s recent contribution with respect to equivalent series resistance (ESR) and the Sencore LC-75 Z-Meter being ...