This could cause a contact to close and activate some warning device such as a buzzer, or cause the switcher to select the camera that detected the motion. The sampling process may take somewhere between one fiftieth of a second and one second to detect a change, depending on the method of sampling.
The U.S. Bureau of Labor Statistics (BLS) reported that jewelers and precious stone and metal workers in general made an average annual salary of $38,840 in May 2012 (www.bls.gov). The bottom 10% made $19,600 a year or less, and the top 10% made $61,940 a year or more.
The basic salesperson within a jewelry store can make between $20,000 and $30,000 in salary and commission, while the owner of a jewelry store, even a small one, can make a six-digit salary. Jewelry repair can also be a great career choice.