12
APPENDIX: Max. number of loop powered ABHW-4BZ
audible bases in one loop
1.
The max. number of loop powered ABHW-4BZ audible bases in one device
loop depends on the available load current for ABHW-4BZ audible bases. The
available load current for loop powered ABHW-4BZs (I) can be calculated by:
I = I
max
– I
d
In which, I
max
is the max load current in one loop under the worst case
scenario with 50
Ω
cable resistance. I
d
is the total load current for the
devices loaded in the loop.
Figure 9: Max. number of loop powered ABHW-4BZ in high dBA
Figure 10: Max. number of loop powered ABHW-4BZ in low dBA
Loop Powered ABHW-4BZ (Low dBA)
0
10
20
30
40
50
60
0
50
100
150
200
250
Load Current (mA) for ABHW-4BZ
audible base quantity
Nu
mb
er o
f
ABHW
-4BZ
Loop Powered ABHW-4BZ (High dBA)
0
5
10
15
20
25
30
35
40
0
50
100
150
200
250
Load Current (mA) for ABHW-4BZ
audible base quantity
Nu
mb
er o
f
ABHW
-4BZ