Bosch Appliances 3122 475 22015en manual Testing the coverage area

INTEGRUS Installation and User Instructions System description and planning en 13

1.5.3System with more than 4 carriers and a radiator under a balcony

Figure 1.29 illustrates a situation in which a radiation signal delay occurs and which can be compensated for. For systems with more than four carriers, add one delay switch position per 10 meter (33 feet) difference in signal path length to the radiators which are closest to the overlapping coverage area. In figure 1.29 the sig- nal path length difference is 12 meter. Add one delay switch position to the calculated switch position(s) for the radiator(s) under the balcony.

16m4m

Figure 1.29 Radiation path length difference for two radiators

1.6 Testing the coverage area

An extensive reception quality test must be done to make sure that the whole area is covered with IR radi- ation of adequate strength and that there are no black spots. Such a test can be done in two ways:

Testing during installation

1.Check that all radiators are connected and powered up and that no loose cables are connected to a radi- ator. Switch the transmitter off and on to re-initialise the auto equalisation of the radiators.

2.Set the transmitter in the Test-mode (see section 2.5.7). For each channel, a different test tone fre- quency will be transmitted.

3.Set a receiver on the highest available channel and listen via the headphones to the transmitted test tone.

4.Test all positions and directions (see next para- graph).

Testing during a meeting

1.Set a receiver in the Test-mode and select the high- est available carrier. The quality of the received car- rier signal is indicated on the display of the receiver (see section 4.3).

2.Test all positions and directions (see next para- graph). The quality indication should be between 00 and 39 (good reception).

Testing all positions and directions

With the transmitter and receiver in one of the two test modes, go around the conference hall and test the reception quality at every position where the infra-red signals must be received. When an area is detected where there is bad reception or even no reception at all, three main causes must be considered:

Bad coverage

The receiver can not pick-up infra-red radiation of ade- quate strength. This can be because the tested position is outside the footprint of the installed radiators or the radiation is blocked by obstacles such as a column, an overhanging balcony or other large objects.

Check that you used the correct footprints for the sys- tem design, that radiators with enough output power are installed and that a radiator is not accidentally switched to half power operation. When the bad recep- tion is caused by a blocked radiation path, try to remove the blocking obstacle or add an extra radiator to cover the shaded area.

Black spots

The receiver picks-up IR signals from two radiators which cancel out each other. The multipath effect can be identified by the observation that the bad reception only occurs along a specific line and/or when good reception returns when the receiver is rotated to anoth- er direction. This can be confirmed by keeping the receiver in the position and direction with the bad reception and then either shading-off the radiation from one radiator with your hand or switching off one radiator. If this improves the reception quality, then the multipath effect is causing the problem. Note that IR radiation that is reflected from a surface with a high reflectabiliy can also cause multipath problems.

Bosch Security Systems 2005-04 3122 475 22015en