This is really great, I appreciate everyone’s input. I would love to track down the source of this anomaly, but unless it has anything to do with the burnt circuit boards I can’t really justify doing so. Is there anyway for these anomalies to effect the units if there not on the same branch...
If it is a single piece of equipment causing the event, why would the load be distributed in such a way that it first spikes on C phase and B phases and then on A phase and B phase. Why wouldn’t it spike on all three at the same time? Is this because of rotor position at start up (assuming it’s...
The below wave forms where captured with a hioki 3196 attached to the load side of the service disconnect of a 300 amp service. The service feeds a lot of computer equipment 3 liebert units and a large Mitsubishi U.P. S system. The distortion occurs at irregular patterns 2 to 4 times an hour...
These readings where taken from a 300amp main on the line side of the disconnect. The building owner has had two liebert units circuit board fried and asks me to monitor the incoming lines. The voltage continually glitches as in figure one. I don't know what’s causing it but I suspect a large...
The problem is intermittent. I had one of the residents keep a log. I don't have it in front of me, but from what I remember it appeared to happen sporadically through out the day at no set intervals. I believe it was worse late at night. I'm not sure about the clustering.
I inspected the area...
ADDENDUM:
Obviously the pixelation only occurs with a digital signal, but wouldn’t some interference be measurable on the other televisions in the apartment.
I recently spoke to an occupant of the apartment complex who is experiencing problems with his reception and he told me that the problem only occurs with digital cable.
In my first post I mentioned multiple houses because that’s what I was told by the cable company. I'm sub contracting from the cable company. When I suggested monitoring for RFI, they informed me that they had the equipment to do that. They just wanted me to monitor the power. As a subcontractor...
Recently A cable company ask us to do some power monitoring at a few of there subscribers houses. Apparently, their having trouble with the television picture tiling, or pixelating in these houses. They have tried everything they can think of. The company thought that it might be a power quality...
I installed a hioki 3196 on sight per-request of the cable company. I sure would like to have the answer for them, even if it’s not the power. Does anyone have any possible answer? The coax is shielded. I did notice the PVC conduit, that the main feed is pulled into the building in, is full of...
