Bosch INT-TX04, Operation Manual, Page: 67 / 94

Integrus Receiver
The receivers can be switched to a test‑mode to get an indication of the reception quality for
each carrier separately. To activate the test-mode:
1.
Push the channel selector to the Up‑position
2. Press the on/off button and hold both for ca. 2 seconds
3. When in test-mode, switch between carriers by using the channel selector
For each carrier the display shows a relative value of the signal strength, Figure of
Merit(FOM), and a graphical quality indication symbol.
The reception quality can be assessed as follows:
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.
The test mode is deactivated when the receiver is switched off.
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 Set transmission (4A), page 52). 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 Integrus
Receiver, page 67).
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.
8.2
8.3
Language Distribution System Testing | en 67
Bosch Security Systems B.V. Operation manual 2013.11 | V1.4 |