User manual

Microgate MicroGraph LED User Manual Page 32 of 88
2.5 SPEEDMETER
This program allows you to measure the speed on the basis of any given length. Speed is
calculated on the basis of the time interval between two Lap-Stop from input or via radio or
manual Lap-Starts pulses. Therefore you only need to place two photocells at the desired distance
and connect them to the Lap and Stop inputs. If the bidirectional mode has been set, the
measurement base can be used in both directions. It is advisable to use the bidirectional mode
only if absolutely necessary. The system is able to manage up to 20 simultaneous transits in the
measurement base.
If a delay has been set for the activation of the stored program (see 'Setup' below), when the time
has passed after the last measurement, the display of the sequence stored as program is
automatically started. This auxiliary function allows you to automatically display information or
advertising during the pauses between transits.
NOTE: Obviously, the precision of speed measurement depends on the accuracy of time
measurement on the measurement base. To ensure a precision of 0.025 Km/h up to speeds of 130
km/h, just place the photocells at least 10 m apart from each other (using MICROGATE photocells).
Increasing the distance increases the measurement accuracy.
RADIO: In addition to giving the manual LAP and START or input LAP or STOP signals, a Linkgate
radio system can be used. In this case the following instructions are available:
Use of 2 Polifemo photocells and 2 EncRadios. The signal of the first EncRadio must be set on LAP
(any), and that of the second on STOP.