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Issue 1
BVR20 Microdrive
Ambient Noise Supplement.
This addendum to the BVR20 Microdrive manual assumes that the user is familiar with the
operation of the BVR20 Microdrive
General Description
The Baldwin Boxall Ambient Noise System is based around the
BVR20
Microdrive.
BVRAMB
ambient noise sensors are connected to the BVR20 via
BVRCI
interface cards.
The BVRCI cards connect via ribbon cable assemblies to
BVRIO40
cards located in the
BVR20.
The BVR20 will accommodate sixteen ambient noise circuits with a maximum of two
BVRAMB ambient noise sensors on each circuit.
Each BVRAMB circuit is terminated to a BVRCI card. Of the three available BVRCI cards
only cards two and three have the ambient noise function. The terminations of these cards
and their associated zones are shown in the following table.
BVRCI card 2
terminal number
BVR20 Output
number
BVRCI card 3
terminal number
BVR20 Output
number
1
1
1
9
2
2
2
10
3
3
3
11
4
4
4
12
5
5
5
13
6
6
6
14
7
7
7
15
8
8
8
16
Note: Important.
The BVRCI cards nominated for use with BVRAMB noise sensors must have their jumper
link LK1 in the ‘0V’ position.
