BVRAMB Ambient Noise Microphone
Installation Instructions
4
BVRAMB issue 4
C O M M U N I C A T I O N S
2.2 I
NSTALLATION
The BVRAMB unit is mounted in a standard double gang surface
mount back-box. Knockouts are located in all sides of the box,
however please refer to Figure 2.1 for the available gland
locations due to the position of internal components.
Figure 2.1 — Available gland locations (front panel removed)
2.3 C
ONNECTION
D
ETAILS
As the BVRAMB Ambient Noise Microphone converts the
ambient noise level to a variable current output only three wires
are required to connect the BVRAMB to the BVRD2M or
BVRDCI module.
The cables should have a conductor cross sectional area of 1.0mm
or greater, and for VA systems should be fire rated.
If required, two BVRAMB Ambient Noise Microphones can be
wired in parallel on the same input to monitor the ambient noise
over a larger area.
When two units are wired in parallel a 5.6K
Ω
compensation
resistor must be fitted to ensure the signal level accurately
represents the level of ambient noise.
Typical connection details are shown in Figure 2.2 for BVRD2M
and Figure 2.3 for BVRDCI.
In both examples the first two units are shown paralleled to the
first input with the 5.6K
Ω
compensation resistor fitted.
