Version 1.10 Pag. 176 di 203
5.3 INVALID TIMES MANAGEMENT
There are cases, during a test, where the program may acquire invalid times. The main cases are:
The OptoJump device is not installed correctly: if the OptoJump device is badly
positioned on the ground, or the ground is particularly uneven, during performance of a
test invalid flight or contact times may occur
The athlete knocks against the device: if during the test the athlete knocks against the
device without causing it to lose its alignment, this may only temporarily generate some
invalid times;
The athlete exits the measurement area: in very long tests, the athlete may exit the
measurement area for one jump and then re-enter the area.
In these cases, it may be convenient to keep the test and make a manual/automatic correction to
times rather than repeat the test itself.
In fact, the OptoJump program contains an automatic and manual system for managing spurious
times acquired during a test. Checking for spurious times is only done on flight, step, and contact
times, with any external times always considered as valid.
The basic criterion is that acquired times are always coupled with (contact time) + (flight time or
step time). Flight or step times without a corresponding contact, flight or step time are only possible
at the beginning or end of a test contact (because of the start or finish type set in the test).
In the case of a very brief contact, flight or step time, there is an automatic procedure that identifies
any invalid times, (i.e., below a certain threshold). This threshold can be set or deactivated (see
chap. 4.4.1.2)
If there are other errors that are not automatically deleted, it is possible to manually correct them.
Select the row with the invalid contact, flight or step time and delete the entire row (and thus the
contact-flight time couple). These values will not be considered in the calculation of average values
and will not appear in the charts.
If it is the contact time that is not average, add the contact-flight time couple to the flight time of
the previous contact-flight time couple. If it is the flight time that is not average, add the contact-
flight time couple to the contact time of the following contact-flight time couple.
The following chart clarifies this concept:
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