2.2.3 PAIRED PHOTOCELLS
To prevent the photocell being interrupted by an athlete's arm swinging forward, in official competitions or
in any case when measurement must be as accurate as possible, the use of paired photocells is necessary.
This setup ensures that time is measured exactly when the athlete's chest crosses the line, as the impulse
(start/stop/lap, depending on the position) is given only when both photocells are interrupted.
To mount the photocells, screw the C bracket onto the tripod platform, the photocells, and the reflectors, as
shown in the figure (the photocells are mounted at 90° with respect to the C bracket).
Then mount the bracket onto the tripod and connect it with the photocells using the jack-jack cable. The
MASTER photocell is the one with the higher serial number (see chap. 5.4.1.1) and blinks more slowly than
the SLAVE. As the Master photocell transmits the signal to the timer, to ensure a wider aerial range, the latter
should always be mounted on top.
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