How to time track and field events?

1. Manual timing and automatic electronic timing are recognized as two formal timing methods.

2. The pointer timing shall be carried out by the timekeeper according to the provisions of rule 120.

3. All manual timing results kept on the runway should be converted into110 seconds. For track events held outside the venue, some or all results should be converted into whole seconds, such as marathon 2: 09: 44.3 should be converted into 2: 09: 45. For example, when a watch stops, the hands stop between two lines. It is calculated according to the worst time. If the second digit of L/ 100 stopwatch or manually operated digital electronic stopwatch is not zero, it should be rounded to L/ 10 second difference, for example,11second should be rounded to 10.2 second.

4. Timing should start from the smoke or flash of the starting gun until any part of the athlete's trunk (excluding head, neck, arms, hands and feet) reaches the finish line and moves along the vertical plane.

5. Among the three official forms, if the scores of two forms are the same but the third form is different, the scores of these two forms shall prevail; If the time calculated in the three tables is different, the intermediate score shall prevail; If only two stopwatches are used and the calculated time is different, the difference time will be the official result. Fully automatic electronic timing.

6. The sports meeting specified in12 1(a), (b) and (c) shall adopt fully automatic timing device.

Full-automatic electronic timing devices are used in domestic first, second and third level competitions.

7. Fully automatic electronic timekeeping must use a device that automatically opens the watch through a starting gun or similar instrument and records the end time. Other timing devices and methods should be regarded as manual timing or not accepted.

8. The automatic timing device must comply with the provisions of this clause and be recognized by the accuracy test results conducted by the host country four years before the competition. The automatic timing device must automatically start timing from the starting gun or similar tool. Therefore, the total delay interval between the firing gun and the starting timing system is stable and less than11000 seconds.

The end point is recorded on a continuously running film by a camera with a vertical slit. If the machine is to be placed on the extension line of the finish line, the progressive time scale of L/ 100 second must be uniformly marked on the film. Time and ranking should be interpreted from the film. The interpretation method is to put the film on a special instrument to ensure that the time scale is perpendicular to the interpretation line, and the time should be interpreted to the difference of L/ 100 second.

If the electronic timing device is not automatically started by a starting gun or similar instrument, the time stamp on the film must automatically indicate this fact. In this case, it should not be considered as the official time, but the film can still be used as an effective basis for judging the ranking.

9. You can use the video recording system with the following prerequisites:

(a) Automatically started by the starting gun.

(b) Use a video camera installed on the extension cable of the terminal and a video tape with at least 50 frames per second.

(c) Equipped with a timing instrument, it can get a reading of L/ 100 seconds. When using the frame-by-frame video recording system, each athlete takes the time shown in the picture just after the finish line or the first picture after the finish line as the official time.

(d) Obtain the approval of the host country.

(e) Can produce printed pictures showing:

(i) Time of each athlete.

(2) Whether the timing equipment is automatically started by the starting gun.

Note: terminal camera system can be used, which consists of CCD camera, computer and supporting electric timing device with at least 100 lines per second. The system should be calibrated by an independent testing laboratory. The images generated by the automatic terminal camera system must be synchronized with the computer system.

10. Fully automatic electronic timing should be regarded as an official achievement, unless the terminal photography judge decides that the equipment is obviously inaccurate for any reason. In this case, the result calculated by the alternate timekeeper is the official result.

When one or more groups in a competition do not have electronic timing results for some reason, the hand timing results of one or more groups should be declared as official results, and other groups should still be declared as official results.

1 1. If possible, at least two terminal cameras should shoot from both sides at the same time.

Note: 1. If two or more finish cameras are used, one of them should be designated as the official camera by the technical representative before the meeting, and the time and ranking recorded by the other cameras should not be considered unless the correctness of the official camera is in doubt or auxiliary photos are needed to solve the order of reaching the finish line (in the official photos, the athletes' images are blurred in whole or in part).

2. If the timing device may go wrong, the standby timekeeper should use manual timing to measure the time.

12. 10000 meters and races below 10000 meters should be interpreted from the finish line photos to1100 seconds, and the score of L/ 100 seconds should be recorded.

For races over 10000 meters on the runway, you should read L/ 100 seconds, then round to the difference of L/ 10 seconds, and record the results with L/ 10 seconds. For example, 59: 26.32 at 20000m should be recorded as 59: 26.4.

For some or all events held outside the venue, the score of L/L00 seconds should be read, and then converted into whole seconds by rounding. If the marathon is 2: 09: 44.32, it should be recorded as 2: 09: 45.

13. Timing devices that can only start or stop automatically, but not at the same time, can neither be used as manual timing devices nor fully automatic timing devices, so they cannot be used to calculate official scores.

14. If possible, the time for all athletes to reach the finish line, each lap time of 800 meters and above, and each 1000 meter time of 3000 meters and above should be calculated. This time can be timed by the backup timekeeper or the first timekeeper, but their watches should be able to time many times.