February 2008 Tech Talk Online Q & A
Q: I have had several commercial alarm accounts that are a problematic with recurring hold-up false alarms. The alarm circuits checkout fine and I really suspect the employees are accidentally pressing the momentary buttons, but don’t want to admit it. Please help.
A: Make the employees more responsible for their accidental hold-up activations. Install mechanical latching recessed hold-up buttons rather than simple momentary buttons. Give the manager a key and then there will be a clear physical indication as to which button was actually pressed. The recessed nature of the button will make it less prone to accidental activation.
Q: I have a customer that is complaining that not all the images in his CCTV picture are in focus. I have tried to adjust the focus on the camera but can only get part in focus. What am I doing wrong?
A: You are dealing with what is referred to as Depth of Field (DOF). To get both close and distant images in focus on a camera you need to either select a smaller lens format, adjust to a higher f-stop, and/or reposition the camera. If you are finding a camera in focus during the day, but out of focus at night then you will have to apply a technique call “back focusing.”
If you enjoyed this article and want to receive more valuable industry content like this, click here to sign up for our FREE digital newsletters!
Security Is Our Business, Too
For professionals who recommend, buy and install all types of electronic security equipment, a free subscription to Commercial Integrator + Security Sales & Integration is like having a consultant on call. You’ll find an ideal balance of technology and business coverage, with installation tips and techniques for products and updates on how to add to your bottom line.
A FREE subscription to the top resource for security and integration industry will prove to be invaluable.