Microgate
Witty TAB User Manual
Page 11 of 33
1.3.3
P
AIRED
P
HOTOCELLS
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 precise 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
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
.
Master
:
Higher S/N,
blinking at regular
speed.
Always on TOP!
Slave
:
Lower S/N,
blinking fast.
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