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a switch or regulator that causes a mechanism to operate at a specific time or at predetermined intervals



a control device that, after a predetermined time interval, automatically starts or stops a system, machine, or apparatus used in industry or the home. The term “timer” is also applied to a monitoring device that signals when such a system, machine, or apparatus is to be started or stopped. Depending on the principle of operation, a timer can be mechanical, hydraulic, pneumatic, or electrical. The time interval of a timer is usually predetermined in the same way as in a timing relay.

Timers are classified as single-shot, multishot, and repeat-cycle. In single-shot timers the time interval is usually set manually, for example, by moving the hand of the time indicator. In this case, the timer mechanism is simultaneously wound, and the timer will operate when the hand returns to zero. Multishot timers automatically operate several times with preset time intervals. Repeat-cycle timers operate with the same time interval (the period of the cycle) after equal periods of time. In multishot and repeat-cycle timers the sequence of time intervals, or the timer schedule, is prescribed by such means as a punched tape, a disk with pins, or a system of shaped cams.

Timers based on clocks have the highest accuracy and reliability, as well as the broadest range of time intervals. Clockworks are used mostly in single-shot and multishot timers designed for operation within a 24-hour period. Electric and electronic time measurement devices are used mostly in repeat-cycle timers that function continuously over periods of several months.




a circuit used in, for example, radar sets, television equipment, and telecommunication systems primarily for the purpose of ensuring that certain processes occur in conformity to certain time relationships.

In radar sets, for example, timers provide synchronization of such processes as the emission of radio signals by the transmitter, the blocking of the receiver during transmission, and the starting of indicator sweeps at the instant the signal is received. In telemetry systems, multichannel pulse communication systems, and other information systems, timers provide a fixed spacing between, for example, information-carrying symbols (in digital transmission) or word or address markers.

The main component of a timer is a generator of frequency-stable oscillations, such as a quartz-crystal oscillator or a maser. The oscillations are used for such purposes as synchronization or the provision of local time markers either directly—that is, in the form they are taken from the oscillator output—or after conversion to other oscillations (or pulses) that are characterized by certain altered parameters, such as frequency, phase, or amplitude. In the case of pulses, the characterizing parameters include pulse duration and shape.



(computer science)
A hardware device that can interrupt a computer program after a time interval specified by the program, generally to remind the program to take some action.
A circuit used in radar and in electronic navigation systems to start pulse transmission and synchronize it with other actions, such as the start of a cathode-ray sweep.
A device for automatically starting or stopping a machine or other device.
(mechanical engineering)
A device that controls timing of the ignition spark of an internal combustion engine at the correct time.
References in periodicals archive ?
The models can be operated automatically using a pneumatic or electronic timer or PLC and a solenoid valve, or they can be activated manually as needed using a self-closing valve.
It is thought to contain information about the electronic timer which detonated the bomb.
The system included 16 bottles filled with an unidentified liquid hydrocarbon, along with three triggers, an electronic timer and a battery, the Paris prosecutor's office said.
Easy cleaning of components, electronic timer and safe rise-andfall basket.
If a signal reached an instrument at the speed of light but that point was converted to a very slow signal, then light would indeed slow down and a conventional electronic timer could measure it.
As each of the 10 shooters on my relay completed the stage, I asked the range officer to review the electronic timer and check the time for the first shot.
This lighted electronic timer and clock was designed to help teach students time management skills.
But Neill, of Whitburn,West Lothian, was allowed to use an electronic timer that detected pigeons returning to his loft.
Put an electronic timer on to your tap and programme the water to come on each day for several minutes.
If buyers are using these times to help themselves select the most athletic lots, why not make the timing process more accurate and consistent by installing an electronic timer for the sales?
There is also a programmable electronic timer and the second electrical conventional oven has a full width variable grill.
Machines also come with an energy-saver feature to stop the compressor and fan when the room gets cool enough, an electronic timer that can be set for 24 hours and Circulaire oscillating louvers for even distribution of air automatically.

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