Setup and Function
23
The block schematic diagram in figure 4-1 shows all externally accessible
signals with gray shading. Every gray area represents a galvanic group that
is isolated from all of the other galvanic groups.
The power connection ("power supply group") and the connections for
“SELV group” (SELV = S
afety Extra Low Voltage) are available on the back
of the test set. All other gray shaded groups are available on the front of the
test set. The safety relevant isolated circuits (power ↔ SELV, power ↔ front
plate, and front plate ↔ SELV) are marked as "reinforced isolation" in the
block diagram.
4.1.1 Voltage Output (Voltage Amplifier)
Figure 4-2:
Voltage amplifier
(voltage outputs)
The four voltage outputs have a common neutral N and are galvanically
separated from all other outputs of the CMC 356. The two black sockets
labeled "N" are galvanically connected with one another.
The voltage amplifier and the current amplifiers are linear amplifiers with DC
coupling. The voltage outputs work in two ranges:
• Range 1: 4 x 0 ... 150 V
• Range 2: 4 x 0 ... 300 V
Protecting the Voltage Outputs
All voltage outputs are protected for open circuits, L-N short-circuits, and
overload. Should the heat sink overheat, a thermal switch turns off all
outputs.
Overload Warning Flagged in the Software
When a voltage output is overloaded, a corresponding warning is displayed
in the user interface of the test software of the OMICRON Test Universe.
Do not connect any of the VOLTAGE OUTPUTS 1 ... 3 or VOLTAGE
OUTPUT 4, respectively, to protective earth. The N sockets, however, may
be connected to protective earth.
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