CMC 353 Reference Manual
36
5.2.3 SELV Interfaces
All inputs and outputs to the SELV group (SELV = Safety Extra Low Voltage)
reference to a common neutral that is internally connected to the protective
earth (GND) of the housing.
5.2.3.1 External Interface ("ext. Interf.")
The SELV interface connector "ext. Interf." holds four additional transistor
binary outputs (Bin. out 11 - 14). Unlike regular relay outputs,
Bin. out 11 - 14 are bounce-free binary outputs (small signals) and have a
minimal reaction time.
In addition, two high frequency counter inputs for up to 100 kHz are
available for the testing of energy meters.
For more detailed information please refer to the technical data section
6.3.7, "Low-Level Binary Outputs ("ext. Interf.")" on page 54.
Meter Testing
For energy meter test applications, the "ext. Interf." permits easy
connectivity.
Synchronization
Via the "ext. Interf.", the CMC 353 time base can be GPS- and IRIG-B-
synchronized. Depending on the synchronization method of your choice,
use either the CMGPS synchronization unit or the CMIRIG-B interface box.
Both synchronization accessories, the CMGPS and the CMIRIG-B, are
optional and are described in more details in section 9.3, "Time
Synchronization Accessories" on page 77.
5.2.3.2 LL out 1-6 (Low Level Outputs 1-6)
The SELV interface connector "LL out 1 - 6" holds two independent
generator triples. These six high accuracy analog signal sources can serve
to either control an external amplifier or to directly provide small signal
outputs.
In addition, a serial digital interface is available that transmits control and
monitor functions between the CMC 353 and the external amplifiers.
Supported devices are CMA 156, CMA 56
1
, CMS 156, CMS 251
1
and
CMS 252.
1
These products are not available anymore.
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