What was wrong with the positive mechanical interlocking with the interlock scheme as I described much earlier?? Cheap, easy, no way to accidentally bypass it. THE TS ASKED for protection against accidentally being exposed, no mention was made as to intentionally bypassing it. This is not for an assembly line and folks trying to make production, this is an individual trying to protect against damage from forgetting to be careful.A simple interlock will do that.

 

What was wrong with the positive mechanical interlocking with the interlock scheme as I described much earlier??

Nothing
Principle as described in post #19.
Max.

 

Nothing
Principle as described in post #19.
Max.

I described the interlock scheme in post #15. Yes, it certainly be defeated, BUT it will always switch off the power if the door is accidentally opened. And with the UV light that should be adequate.

 

Why am I getting a notification about this thread? Especially when the solution was delivered almost a year ago???

 

Click "Unwatch".

 

Hello,

A necropost triggered the notification.
MrChips deleted the necropost.

Bertus

 

As important as the switch is the design of the interface between the door and the cabinet frame. Make sure you have overlapping joints. Even if there is a small-but-visible gap between the edge of the door and the frame of the cabinet, you don't want there to be a straight-line unobstructed path for the light rays.

For our MIL projects in the TEMPEST space, one of our unofficial tests of shielding integrity was to put a 200 W light inside the cabinet, close everything, turn off the room lights, and fire it up. This was surprisingly effective. It found micro pin holes in seam welds, uneven pressure in strip gaskets, loose fasteners, etc. If the light is contained by design, then all the door has to be is closed, and your switch will monitor that.

ak

 

As important as the switch is the design of the interface between the door and the cabinet frame. Make sure you have overlapping joints. Even if there is a small-but-visible gap between the edge of the door and the frame of the cabinet, you don't want there to be a straight-line unobstructed path for the light rays.

For our MIL projects in the TEMPEST space, one of our unofficial tests of shielding integrity was to put a 200 W light inside the cabinet, close everything, turn off the room lights, and fire it up. This was surprisingly effective. It found micro pin holes in seam welds, uneven pressure in strip gaskets, loose fasteners, etc. If the light is contained by design, then all the door has to be is closed, and your switch will monitor that.

ak

The whole tempest program was a lot different from just protecting against UV light. The purpose of Tempest was to secure computer and communications systems against any RF leakage that could somehow be a data leak that the "bad guys" could use. It was rather expensive to implement and maintain, and I am not sure if it is even still in place.
The good news is that the unintended secondary results were a big drop in radiated computer noise in tthe RF spectrum.

 

The whole tempest program was a lot different from just protecting against UV light. The purpose of Tempest was to secure computer and communications systems against any RF leakage that could somehow be a data leak that the "bad guys" could use. It was rather expensive to implement and maintain, and I am not sure if it is even still in place.
The good news is that the unintended secondary results were a big drop in radiated computer noise in tthe RF spectrum.

EMSEC is the modern name.
https://lih-cai.cse-cst.gc.ca/course/info.php?id=120

 

The whole tempest program was a lot different from just protecting against UV light.

Yup. Know that.

The purpose of Tempest was to secure computer and communications systems against any RF leakage that could somehow be a data leak that the "bad guys" could use.

Know that, too. AND - not just RF. TEMPEST (and it's little brother, MIL-STD-461) are equally focused on conducted emissions; and susceptibility (those power line filters are - large); and acoustics.

The good news is that the unintended secondary results were a big drop in radiated computer noise in tthe RF spectrum.

Nope. disagree. Zero effect.

TEMPEST affects an almost trivially small *percentage* of all military and governmental electronic systems. And, since governmental stuff really is a trivially small amount compared to consumer/commercial/industrial/medical stuff, the overall effect of a little extra shielding here and there is immeasurable in terms of its reduction of RF pollution. Note that MIL specs codified an awareness of electronic security in both emissions and susceptibility way before TEMPEST concepts were formalized.

ak

 

TEMPEST:

Transient
Electro
Magnetic
Pulse
Emissions
Susceptibility
Transients

 

TEMPEST:

Tiny
Electro
Magnetic
Pulses
Emitting
Secret
Things

 

TEMPEST:

Tremendously
Endowed
Men
Performing
Extreme
Sexual
Techniques

 

Tempest


Wish I had back some of the cars I had as a kid. Anyway the above is a Tempest. Even older than the thread, much older.

Ron