CMC 356 Reference Manual
36
5.2.6 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.
5.2.6.1
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
6.3.6, "Low-Level Binary Outputs ("ext. Interf.")" on page 54.
Meter Testing
For energy meter test applications, the "ext. Interf." permits easy
connectivity. For more information about the connection of scanning heads
please refer to sections 9.6.5, "Adapter Cable for Scanning Heads" on page
117 and 9.6.6, "CMLIB B" on page 118.
Synchronization
Via the "ext. Interf.", the
CMC 356
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 107.
ext. Interf.
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