Determining Delay Switch Positions By Using A Delay Measuring Tool - Bosch INTEGRUS Installation And Operating Manual

INTEGRUS | Installation and Operating Manual | System description and planning
Note: For systems with a cable length dif-
ference of more than 50 meters, it is rec-
ommended to use a measurement tool to
determine the delay differences in order
to calculate the delay switch positions.
Figure 1.26 and table 1.1 illustrate the calculation of the
cable signal delay.
20m
R2
R5
20m
Figure 1.26 System with five radiators and measured cable
lengths
Table 1.1 Calculation of the cable signal delays
Radiator Total cable
number length [m]
1
2 30+20 = 50
3
4
5 30+20 = 50
Note: The used cable signal delay per
meter is an example. Use the actual sig-
nal delay per meter in this calculation as
specified by the manufacturer.
Bosch Security Systems | 2003-02 | 3122 475 22011en
R1
20m
R3
R4
Cable signal delay
per meter [ns/m]
30 5.6
5.6
20 5.6
30 5.6
5.6
1.5.1.2 Determining delay switch positions by
using a delay measuring tool
The most accurate way to determine the cable signal
delays is to measure the actual signal delay for each
radiator as described in the following procedure:
1. Disconnect the cable from a radiator output of the
transmitter and connect this to a delay measure-
ment tool.
2. Disconnect a radiator from this cable.
3. Measure the impulse response time (in ns) of the
cable(s) between the transmitter and the radiator.
4. Reconnect the cable to the radiator and repeat
steps 2 to 4 for the other radiators that are connect-
30m
ed to the same transmitter output.
5. Reconnect the cable to the transmitter and repeat
step 1 to 5 for the other radiator outputs of the
transmitter.
6. Divide the impulse response times for each radiator
by two. These are the cable signal delays for each
radiator.
30m
7. Determine the maximum signal delay.
8. Calculate for each radiator the signal delay differ-
ence with the maximum signal delay.
9. Divide the signal delay difference by 33. The
rounded off figure is the delay switch position for
that radiator.
10. Add delay switch positions to radiators under a bal-
cony, if applicable (see section 1.5.3)
11. Set the delay switches to the calculated delay switch
positions.
Cable sgnal
delay [ns]
30*5.6 = 168
50*5.6 = 280
20*5.6 = 112
30*5.6 = 168
50*5.6 = 280
Caution: Turn the delay switches carefully
to a new position until you feel that it
clicks into position, to prevent that a
switch is positioned between two
numbers, which would result in a wrong
delay setting.
Signal delay Delay switch
difference [ns] position
280-168 = 112 112/33 = 3.39 = 3
280-280 = 0
280-112 = 168 168/33 = 5.09 = 5
280-168 = 112 112/33 = 3.39 = 3
280-280 = 0
en | 10
0/33 = 0
0/33 = 0