Why is a 1.5-2 volt AC signal on my Neutral line?
I just purchased a NAIM integrated amp and I am experiencing a hum but only from the DVD player. DVD player connected to a TV? TV connected to CATV? Disconnect the incoming CATV coax from the CATV box then check for hum. If no hum..... Buy a Jensen ISO transformer.... |
After a lot of investigation I found that some units have a 1.5-2.0 volt AC signal (sounds like a 60Hz signal i.e. hum) between the neutral side of the interconnect and the earth at the power bar. between the neutral side of the interconnect and the earth at the power bar.Williewonka, Not sure what test you preformed.... Can you be more specific. What do you mean by "neutral side of the interconnect"? Lifting the ground makes the amp hum moreAre you sure the sound you are hearing is a hum and not a buzz. Does the noise vary when changing the volume level? I just purchased a NAIM integrated amp and I am experiencing a hum but only from the DVD player.I would try what Al said in his post. Could be a bad interconnect. Could be a bad signal ground solder connection inside the DVD player. Does the hum/buzz change if you put your hand on the metal case of the DVD player? I would also try another set of line-input jacks on the NAIM. |
Blindjim, A difference of potential, voltage, measured at an electrical outlet measured from the neutral to the equipment grounding conductor can be the result of VD, voltage drop, on the loaded neutral conductor. If the resistance of the equipment grounding conductor is less than the resistance of the loaded neutral conductor then there can and will be a difference of potential between the two conductors. VD is directly proportional to the size, length, and load placed on the conductor. Poor connections along the length of the conductor can cause higher resistance in conjunction to the amount of load placed on the branch circuit neutral as well. As Simply_q said in his post the main service earth ground connection does not come into play. In most cases the branch circuit neutral conductor as well as the branch circuit safety equipment grounding conductor terminate on the same neutral/ground bar in the main electrical service panel.... Sub panels will have them separated on two different bars but they still end up tied together at the main service electrical panel via the feeder neutral conductor and equipment grounding conductor. Both connect together at the main panel. |
UPDATE: turns out NAIM only ties the neutral side to the ground in their source components - not at the amp. Williewonka, ?? Your use of the word neutral is confusing.... From reading your posts I believe you use the word neutral in reference to the outer shell of the RCA jack, the signal ground. Are you saying on your NAIM amp the signal ground is not connected to the chassis? The chassis is only connected to the safety equipment ground? On the rear panel of the amp is there a signal ground lift switch by chance? Lifting the ground makes the amp hum moreThat would make sense if the signal ground of the amp is not connected to the chassis. |
