Don't have any numerical values. If i get a chance will blow the dust off the specturm analyzer and show / create an actual example.
But in the mean time, here is an example that was a rather interesting experiment we did a loooooong time ago.
On transmision of low power say 1 watts output from a a transciever so about 6 watts out of the antenna, we would lock up an on line pc. So we put an isolation transformer in the ac line to it, completely enclosed the pc , wring etc, in a solid metal shield, EXCEPT for the face of the monitors glass tube, and provided a separate grounding system for the pc and downstream side of the transformer. The ground wire was actualy a 1" diameter piece of copper tubing and the inside of it was used as the conductor tied to a 10' driven ground rod.
If the transmitted freq was near (don't remember how much) the pc cp operating htz, fundamental overload occured
and the pc screen would first turn blank white and stay that way even after the transmitioin was stopped and pc unplugged
for some time. Placed a wire meshed screen over the monitor screen some distance away from it and tied it to the ground system.
Don't remember the extimated / calculated freq based on screen opening, and it did provide for interference rejection but was not satisfactory, ie; could move the interfering freq a little closer ......signal to noise ratio was down a little.
Here is another un quantified one.
Just do TIG welding near a PC . Say the pc is 15 away, shoot, it wiped the hard drive!
Another little tid bit for info:
Ever read that tag that's on an electronic device that says something like " this device complies with FCC rule ???15"
so the device cannot radiate signals but must be able to accept them.
Another practical example:
House telephones, cheap ones had no filtering for noise or filtering that was about usless, but you would never have a problem with
a good phone made by AT&T. Not much of a problem anymore as the phones function in the giga htz range.
Then there are rules form a safety point of view that came out some 10? years ago. The field as measured in gauss? had to be within a certain level from a people location point of view......don't remember specifics.
So the EMI / noise,contol & elimination of it is not simply a some value that one can use as a quideline.
So one must measure the values to have a feel of relative intensity and that info is tied to how sensitve the offended circuit / electrornics is. Also as distance increases from the source the field intensity drops off.
That's why you don't see any qauntification, all is specific to the situation at hand, and also most folks don't have the equipment to measure.
RICH