Bosch INTEGRUS - Page 52

52 en | Testing INTEGRUS
2023-01 | V01 |
User manual
Bosch Security Systems B.V.
Bad coverage
The receiver cannot pick up infrared radiation of adequate strength. This can happen because:
– The tested position is outside the footprint of the installed radiators
– The radiation is blocked by obstacles such as a column, an overhanging balcony or other
large objects.
In the first case:
1. Check that you used the correct footprints for the system design.
2. Check that radiators with enough output power are installed.
3. Check that a radiator is not accidentally switched to half-power operation.
When the bad reception is caused by a blocked radiation path:
– Try to remove the blocking obstacle
– Add an extra radiator to cover the shaded area.
Black spots
The receiver picks up IR signals from two radiators that cancel out each other.
You can identify a black spot when:
– The bad reception only occurs along a specific line, and/or
– When good reception returns when the receiver is rotated to another direction.
To confirm this:
1. Keep the receiver in the position and direction with the bad reception.
2. Shade-off the radiation from one radiator with your hand, or switch off one radiator.
If this improves the reception quality, then the black spot is causing the problem. Note that IR
radiation that is reflected from a surface with a high reflectively can also cause black spots.
Black spots can occur in case a transmitter is located in the same room as the radiators. In
that case:
– Disable the mini IR radiator of the transmitter with the configuration menu.
– Check that the signal delay compensation switches on the radiators are set to the correct
value.
– Check that a switch is not accidentally positioned between two numbers.
– Re-check your system design. When necessary, reduce the distance between the two
radiators that cause the problem and/or add an extra radiator.
Note that due to the physical characteristics of the signal distribution, it is not always possible
to completely avoid black spots.
Interference from IR systems
IR assisted hearing systems and IR microphones operating at frequencies above 2MHz can
disturb the reception at the lowest carriers. In such case, disable the lowest two carriers and
re-check the reception.
Refer to
– Integrus Receiver, page 51