AiM MyChron3 Basic - Manual (Page 25)

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time is about 1 minute, set this parameter at 50 seconds. The
Beacon obscuring time can be set between 3 and 59 seconds.
A proper obscuring time helps the MyChron 3 to know which
lap beacon is the correct one to read.
AIM recommends using only one lap transmitter at the
track. Additional transmitters should be used for splits (see
below)
To run this function, after having entered the CONFIGURATION
MODE, push MENU/<< until you see:
OBSCURING TIME
Then push MEM to enter EDIT MODE: use MENU/<< to change
numbers and button >> to change digit. The blinking number
identifies the digit that can be edited.
Press MEM to save the changes or VIEW to discard the
changes.
Split’s
number This function sets how many “split beacons” you have on the
track. You can place multiple beacons around the track to
indicate splits (or segments). This way you can compare your
times through one section (like a corner) separate from the rest
of the lap. If there is more then one transmitter on the track, you
can choose to capture the segment times by setting the
“Number of Splits” or ignore the segment times by using the
“Obscuring Time Option” (see above).