We recently purchased a used screened room and had it installed in our
new spaces. Is there a simple test to see how well it has been put
together?
Years ago I helped with the commissioning of a couple of Belling-Lee
rooms. These were used to stop emitters getting out, so only about 3
freqs were of interest. The usual tests were to use a Spec An outside
to see the ambient environment, then take them inside to verify the
atttenuation. This was an HP141 type, some of the newer one generate
significant internal noise that can screw up your results.
Then we fired up the emitters inside to verify that they were
sufficently attenuated outside.
The Belling-Lee engineer also mentioned that one of his clients (UK
MOD ?) used a high-power sweep oscillator inside the room, while
monitoring outside.
The biggest problems were torquing down the panels evenly and the door
fingerstock being adjusted correctly.This took about 2 days to get it
near-perfect. Unfortunately, these items require periodic checking
throughout the room's life, as they do shift with time and use.
Barry