Setting Time Delay; Calculating The Time Delay - Beyerdynamic IRIS Notice D'utilisation

IRIS – Iris EF Digital Infrared Radiator
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4.2.8 Setting time delay

The receiver receives signals from two or more infrared radiators. Delay variations can compensate for
"blind spots". To compensate for delay variation, the signal delay can be set accordingly at the infrared
radiator in order to increase the delay. The display is from 00 to 99. One unit corresponds to
25 ns, i.e. the delay time can be adjusted between 25 ns and 2475 ns.

4.2.9 Calculating the time delay

If only one infrared radiators is connected to the control unit or one radiator per line with
cables of equal length, there is no delay. In this case, the setting of all infrared radiators should be 00.
In other respects calculate the delay for each infrared radiator according to the following formula.
Formula: X = (Lmax - L) x 5.6
25
Cable delay factor 5.6 ns/m
X : delay compensation to be set
Lmax: the distance (in metres) between the control unit and the infrared radiator that is the furthest
away in a line
L : the distance between the control unit and the infrared radiator to be set (in metres)
The values of Lmax and L are identical for the infrared radiator that is the furthest away.
In order to determine the setting, first measure the length of the cable.
Determine the respective cable length from the control unit to each infrared radiator (L).
For each line, determine the distance between the control unit and the infrared radiator that is the
furthest away (Lmax).
For each radiator, calculate the difference from L to Lmax.
For each radiator, calculate the signal delay compensation to be set as per the above formula.