Chapter 12: Adjustments - AVS Electronics BM 120 M Handbuch

Chapter 12: Adjustments

1) Orientate at sight the device in the direction of the transmitter and connect a voltmeter betwen
the negative (-) and TP terminal
(Test Point) on board
2) Orientate the device in horizontal
way, looking for the position
giving the max reading; in case it
is over 7,3 Volt tthe signal level
must be reduced by use of
LEVEL trimmer, in such a way
as to bring the signal to the best
point of working, that's to say 7,3
Volt
• It is possible to have a high value
also with receiver not aligned to
transmitter; in this case it could be a reflection of the beam transmitted, which must most be
taken into consideration.
• In case the signal does not reach 6,8 V having LEVEL trimmer at max, move the device in
vertical way within a limit of 10-20 cm.
• Shouldn't it be possible to reach the min. value, it will be necessary to decrease the distance
between receiver and transmitter or look for a better alignement position
3) Check the quality of the signal received, keeping in mind that in absence of seeming movements
inside the protected area:
• Green Led on fix: there is no signal noise
• Green Led quick or slow flashing: the signal noise is low but is anyway
detected by the beam
• Green Led slow flashing (off for about 1 second) , the signal noise
is more important and it is near to the intervention threshold of the
beam
In order to have a more precise indication of noise quantity, it is suggested to make mesurements
with an oscilloscope, as specified in chapter 13 (Measurements of the signal by oscilloscope)
on the following page
4) Once reached the best condition of working, make a test through the pushbutton TEST C.A.G.
placed on the receiver board.
Keeping the pushbutton pressed , the red alarm led will light up for about 10 seconds, then the
green led will light up again to show normal working; now the pushbutton can be released
5) At the end of all tests, for a reduced consumption of the receiver, it is possible to take off the
jumpers S1 and S2 (Led OFF) which disable the green led and the red led respectively.
OFF LED VERDE
LED
7,3 Volt
VERDE
- 39 -
OFF LED ROSSO
LED
ROSSO
A B
OFF GREEN
OFF LED VERDE
LED
LED
GREEN LED VERDE RED LED
LED TX
E
N
G
LED
ROSSO