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Siemens Building Technologies
Cerberus Division
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
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
Data lines for LON/CerCom connections
Vm:
[V1 ... Vx]
Qn:
[Q1 ... Q4]
An automatic test with a Cerberus template covers the following measuring sequence:
Cable attenuation
DC cable resistance
Line impedance
Example of a measuring sequence and its assessment
Attenuation
[dB]
FAIL
PASS
The cable should be longer than 100 m in order to achieve a valid assessment.
SELF TEST been carried out?
CBUVm_Qn
LONVm_Qn
Version number
Cable quality which complies with this tolerance.
(Att) f=30kHz ... 300kHz
(DC-R)
(User Def) f=30kHz ... 300kHz
Impedance
[Ohm]
[kHz]
FAIL
PASS
FAIL
[kHz]
11
e3180a.doc
12.2000
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