Thank you Rock95seven for the superb link on ground standards.
It reminds me of two things.
One.) I seem to recall that somewhere I read that there are bags of certain chemicals of some kind that can be poured down into a ground hole to vastly improve grounding properties, but I have never been able to find such an article, so maybe I dreamed it or possibly it’s prophesy, in which case it will be discovered in the future.
Two.) This is a true story of a job I had providing tech support to a broadcast facility which was a good job for 10-years until a young know-it-all punk weasled his way into the boss position.
He arranged to have an entire rebuild of the recording studio using an outside company because it was populated by young people like him, and he ignored me because I was a few years older.
But the new studio was hum city after the contract was signed and the bill paid, so it befell me to look for a cure. I talked to the installer and asked what kind of ground impedance I should expect, and he said 300-ohms. He had a reason for saying that, based on the notion that an older building would not have a good ground.
But I was finding about 30-ohms, which obviously is preferable.
But the punk boss decided it should be 300-ohms, based on the word of his outside contractor. End of discussion.
The hum was solved by purchasing bags full of ground-lifters for all the equipment.
Really a Good Link
Thank you Rock95seven for the superb link on ground standards.
It reminds me of two things.
One.) I seem to recall that somewhere I read that there are bags of certain chemicals of some kind that can be poured down into a ground hole to vastly improve grounding properties, but I have never been able to find such an article, so maybe I dreamed it or possibly it’s prophesy, in which case it will be discovered in the future.
Two.) This is a true story of a job I had providing tech support to a broadcast facility which was a good job for 10-years until a young know-it-all punk weasled his way into the boss position.
He arranged to have an entire rebuild of the recording studio using an outside company because it was populated by young people like him, and he ignored me because I was a few years older.
But the new studio was hum city after the contract was signed and the bill paid, so it befell me to look for a cure. I talked to the installer and asked what kind of ground impedance I should expect, and he said 300-ohms. He had a reason for saying that, based on the notion that an older building would not have a good ground.
But I was finding about 30-ohms, which obviously is preferable.
But the punk boss decided it should be 300-ohms, based on the word of his outside contractor. End of discussion.
The hum was solved by purchasing bags full of ground-lifters for all the equipment.