Bosch INTEGRUS Service Manual download pdf (Page 66)

66 en | Testing Integrus

IOM-INT | V1.1 | 2010.12 Installation and Operation manual Bosch Security Systems B.V.

The test mode is deactivated when the receiver is switched off.

8.3 Test the coverage area

An extensive reception quality test must be done to make sure that the whole area is covered

with IR radiation 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 radiator. 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 7.2.2 ). For each channel, a different

test tone frequency 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 paragraph).

Testing during a meeting

1. Set a receiver in the Test-mode and select the highest available carrier. The quality of the

received carrier signal is indicated on the display of the receiver (see section 8.2 ).

2. Test all positions and directions (see next paragraph). 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 infrared 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 infrared radiation of adequate 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 system design, that radiators with enough

output power are installed and 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 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 black spot 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 another

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 black spot is

Indication Quality

00-39 Good reception. Very good audio quality.

40-49 Weak reception. Ticks in the audio.

50-90 No or bad reception. Poor audio quality.

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Bosch INTEGRUS Service Manual Page 66

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