AVC761 Motion Detection Relay Click

[todd2 0]

As I had mentioned in an earlier thread, I removed the buzzer from my DVR for

complete silence. However, today as I was playing with motion detection, I was

upset to find that when detection was activated (and deactivated), a loud click

is generated by the unit. I knew this wouldn't be for the recording of the hard

drive, since it's already spun up and controlled by software, so I guessed it would

be either related to the buzzer (which the DVR doesn't know is gone) or the

external alarm notification via the rear DSUB connector.

 

I found that by setting the first ALERT setting, "EXT ALERT," to OFF,

the click goes away and I get silent operation. I'm happy but this doesn't make

too much sense since the description is

 

"Select to enable or disable the sound when any external alarm is triggered."

 

(Perhaps the relay I hear is the external alarm *output* relay for motion

detection? I wouldn't use that output to trip a monitored alarm if they're

any windows in the room since clouds and moving sunlight will cause it go off.)

[scorpion 0]

You can control an outdoor strobe.

You could control flood lights, or other devices.

 

Nice features to have.

 

Why does your system have to be so quite? With the fans that they shove in them I am surprised you can hear the relay!

[todd2 0]

I removed the little stock fan as it made way too much noise. Right now I

have the cover open with a room fan blowing on it--I'm just playing with it.

The larger the size of a fan, the quieter it can be and still deliver the same

air flow. Ultimately, I'm going to attach a quieter fan to the back with

a funnel duct.

 

The more noise the system makes, the more easier it will be detected.

The goal is to catch someone, not scare them away. Think if an undercover

informant wore a wire that clicked whenever someone walked through

the door. That guy wouldn't live too long, right?