timer

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timer

(tīm′ĕr)
A device for measuring, signaling, recording, or otherwise indicating elapsed time. Various forms of timers are used in radiographic, surgical, and laboratory work.

timer,

n radiographic timing device that functions as an automatic exposure timer and a switch to control the current to the high-tension transformer and filament transformer. The face of the timer is calibrated in seconds and fractions of seconds. The timer controls the total time that the current passes through the radiographic tube and thus the time during which the roentgen rays are emitted. The timer activates a switch or contractor that closes and opens the low-voltage circuit of the high voltage.
timer, electronic,
n an electronic vacuum tube device, with no moving parts, that covers a time range of 1/20 to 10 seconds. It automatically sets itself, is more accurate than mechanical timers, and meets all the needs of modern high-speed dental techniques.
timer, foot,
n a timer with an attachment that permits the timing device to be activated by foot pressure. This is the preferred type of timer.
timer, hand,
n an attachment to or part of a timer that requires thumb or finger pressure to activate the timing device.
timer, mechanical,
n a timer using a spring mechanism for determination of length of exposure. Accuracy of timing is not assumed in exposures of less than 1 second with a mechanical timer.

timer

the device on the x-ray machine that controls the period of exposure to the beam. It may be a simple clockwork, wind-back timer, or one of two electronic timers which are capable of fast and repeated exposures. Only electronic timers are allowed on modern machines.
References in periodicals archive ?
When looking at driver response, deceleration rates were more gentle when presented with the countdown timers, and we did not find that drivers accelerated to try to beat the light - those are positives for safety.
The SPT Series represents a modern timer distribution system that is easy to deploy and easy to use, filling the hole left by vendors who no longer serve this space while evolving production timers for the network," said Reimund Baeuerle, Co-managing Director, Plura Europe GmbH, a subsidiary of Plura Broadcast.
In addition to the clock, this timer is also the only one with simultaneous count-up and count-down timers--both can be running at the same time, much like the aviation-purposed timers.
A number of motorists expressed resentment at the move by the traffic department to remove digital timers at all traffic lights and intersections.
8220;We are pleased to add Time Timer to our list of Teachers' Choice Award-winning companies,” said Anne Sumpter, publisher of Learning.
Mr Koutsantonis said the introduction of the first timer at North Terrace has shown most pedestrians understand the purpose of the countdown timers and how to use the information.
For handgunners, raining without a timer is like training without a target.
Plug-in Digital Programmable Appliance Timer, pounds 9.
About 35,000 Grasslin QE7 and Trac EQ7 timers have been sold in the UK since 1999, with a further 30,000 Grasslin QE7 timers sold in the Republic of Ireland.
Further, the new support for an interrupt, timers and general purpose I/O greatly expands the capabilities," stated Bob Cantwell, director of ASIC/FPGA Engineering at Ceterus Networks.
Electric timers often are linked to home protection and energy conservation.