You Learn Something New Every Day

[John D v2.0]

It's not an excuse, I don't actually think it's a problem. The fact it seems to upset people is surely their problems. Even if the moderation policy on here was actually good, I wouldn't think it's going to become my problem any time soon.

 

[securespark]

They were secured, they came adrift.
I've sorted it now.
I was just interested in the internal circuitry of the panel that caused a tamper alarm to sound even though the tamper loop was not broken.

 

[John D v2.0]

They were secured, they came adrift.
I've sorted it now.
I was just interested in the internal circuitry of the panel that caused a tamper alarm to sound even though the tamper loop was not broken.

Could be that the 4k resistors or whatever is built into the alarm at either end of the loop. So you can either break the connection to set it off, or short the loop to either rail of the supply. It makes sense to detect any connection of the loop to somewhere it shouldn't be connected to in case you were actually a burglar doing surgery on the alarm box.

 

[securespark]

Yeah, fair enough.

 

[sparkymarka]

Nothing to do with it .....
Tamper loops are a negative loop
Alarm loops positive loop
If you short them together you will get a tamper
Most speakers on alarm panels use a common positive and a switched - for the speaker drive
Your tamper loop probably touched the positive hence the tamper