Setting Time Delay; Systems With One Infrared Radiator - Beyerdynamic Iris TS Mk II Notice D'utilisation

IRIS – Iris EF Digital Infrared Radiator

4.2.8 Setting time delay

As outlined in section 4.2.7, signals received from two or more infrared radiators can result in "blind
spots" caused by differing signal delays associated with the radiators.
Causes of signal delays:
• Cable signal delay caused in the cable used to transfer the signal from the transmitter to the radiator.
• Radiation delay caused by the transfer of the signal through the air to the receiver.
• Transmitter signal delay caused by two or more transmitters being used in a bypass configuration.
To compensate for delay variations, the signal delay value can increased as required on each infrared
radiator. The delay can be set to a value between 00 and 99, where one unit corresponds to 25 ns,
meaning that the time delay can be adjusted by between 25 ns and 2475 ns.

4.2.8.1 Systems with one infrared radiator

If there is only one infrared radiator connected to the control unit, or if there is only one radiator per line
connected with cables of equal length, there is no need to take any delay into account. In this case, the
delay must be set to 00 on all the infrared radiators.
Otherwise the delay for each infrared radiator can be calculated using the formula below.
Formula: X = (Lmax - L) x 5.6
25
Cable delay factor 5.6 ns/m
e.g. RG 59 (75 Ω) signal delay 5.07 ns/m
X: delay setting
Lmax: the distance in meters between the control unit and furthest infrared radiator on a particular line
L: the distance in meters between the control unit and the infrared radiator on which the delay is to be
set
To set the delay for a particular radiator based on cable length, proceed as follows:
1. Measure the cable length (L) between the transmitter and each individual infrared radiator.
2. Determine the maximum cable length (Lmax).
3. Calculate the cable length difference for each radiator (Lmax – L).
4. Multiply the different cable lengths of the individual radiators by the cable delay factor per meter to
get the cable signal delay for each radiator.
5. Divide the calculated signal delay by 25. The rounded number is the signal delay value that needs
to be set for the radiator in question.
6. Add an additional delay for radiators installed under a balcony.
7. Set the calculated delay on the radiator.
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