2015年10月19日 · Capacitive coupling occurs because any two conductors form a capacitor, just not a very good one. You can shield against capacitive coupling by putting a grounded shield around one or both wires. Inductance is the phenomenon whereby a current in a coil causes a magnetic field which opposes the flow of current in the short term.

2010年3月14日 · I have a 120VAC control circuit using a Magnecraft W388ACPSRX-30 Time Delay Drop Out Timer. The 120VAC signal wire is between 30 & 60 feet long. It is routed in wire bundles that are about 2 to 3 inches in diameter. When the contact opens to de-energize the timer a pesky 10 volts AC...

2015年10月11日 · If you assume 1000 pfd for the hot to float capacitance, capacitive reactance is about 2.7 megohms at 60 Hz, then a 10 megohm meter would read about 10/10.36 = 0.96 times the source voltage. This calculation is from a right angle vector diagram.

2025年1月10日 · It absolutely is a pull down resistor. There are two reasonable ways to calculate the value. 1) Figure out the impedance of the phantom 'source' and then select a resistance that is low enough to pull that source down enough to render the interfering signal negligible.

2020年5月1日 · Capacitive coupling depends on voltage or charge accumulation, and not current flow. And it's not clear how the telsa coil is connected to "drive" a circulating current through the slip rings. So its also hard to say for sure there is any capacitive coupling.

2024年6月2日 · The “classic” case of ghost or phantom voltage is caused by capacitive coupling. In a typical case an energized conductor is in the neighborhood of a unconnected neutral conductor. This “neighborhood" physical proximity causes a capacitance between the conductors of ~ 5 to 20 pF per foot.

2019年12月18日 · If you have a large ungrounded system, there is significant capacitive coupling to ground, which may not be perfectly balanced. Perhaps one phase or another is very close to ground potential, or perhaps all are at elevated potential. Power strips with MOV 'surge suppressors' generally have these MOVs between the circuit conductors and ground.

2015年10月28日 · The next tests are for capacitive coupling. Care has to be taken with meter leads to prevent unwanted coupling. Twist the leads full length and run so there is minimum coupling from 120 hot. 120 V 60 Hz was applied between the Romex black lead and the combined white and ground wires of the Romex closest to the Belden 8723.

2010年3月14日 · Only one timer out of the 8 in this order malfunction in this manner. There are two True Time Delay timers in this order with the .1 to 10 sec range. Neither will work in that circuit without help, the resistor. I am betting a resistor will be …

2009年8月14日 · Hello guys and gals. Was troubleshooting an actuator today that had 130V on the close input but would not close. To keep a long story short, I went and bought a solenoid tester to make sure it was not ghost voltage caused by capacitve coupling. The solenoid tester showed no voltage...