11
Siemens Building Technologies
Cerberus Division
e3180a.doc
12.2000
5 Operation
5.1
Preparations prior to field application
1.
Is the test set complete?
2.
Has the alkaline battery cassette been fitted, are spare batteries available?
3.
Is the rechargeable battery cassette available and are batteries charged? Are spare
charged batteries available?
4.
Have date and time been set in the device?
5.
Has result memory been erased?
6.
Has template for Cerberus data lines been loaded and checked to ensure that it is up
to date?
7.
Has device performance check
SELF TEST been carried out?
8.
Obtain information regarding the data line to be ,measured
-
Type of cable, line cross-sectional area, length of cable
-
Cable installation, location of bus nodes, length of segments
5.1.1
Tolerance masks (Templates)
The following tolerance masks are used for the automatic measuring of a Cerberus
data line, e.g.:
Data lines for C-Bus connections
CBUVm_Qn
Data lines for LON/CerCom connections
LONVm_Qn
Vm:
[V1 ... Vx]
Version number
Qn:
[Q1 ... Q4]
Cable quality which complies with this tolerance.
An automatic test with a Cerberus template covers the following measuring sequence:
➜
Cable attenuation
(Att) f=30kHz ... 300kHz
➜
DC cable resistance
(DC-R)
➜
Line impedance
(User Def) f=30kHz ... 300kHz
Example of a measuring sequence and its assessment
[dB]
[kHz]
Attenuation
PASS
FAIL
[kHz]
Impedance
[Ohm]
PASS
FAIL
FAIL
i
The cable should be longer than 100 m in order to achieve a valid assessment.
Summary of Contents for Cerberus NW8005
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