MPD 800 User Manual
22 OMICRON
Integration into systems
The MPD 800 acquisition unit, CPL1, CPL2 and the V-to-AC-adapter are designed as a system. It is
recommended to use them as described in the respective “Designated use” (see 2.2) and “Application”
(see 2.3) chapters. If one or more of the MPD 800 system components need to be integrated into a
system, the following additional precautions must be fulfilled:
► If connected to an existing coupling capacitor, locate external quadripoles CPL1 and CPL2 in close
proximity of the bottom end connection of the coupling capacitor with a distance of less than one
meter.
► If a ground-referenced measurement device which is not part of the MPD 800 system is used
together with the MPD 800 system, use CPL2 due to special grounding restrictions. The maximum
ground-referenced voltage at the input of the low arm capacitor must not exceed 140 V
RMS
under any
measurement condition. Therefore, perform additional precautions to achieve the desired safety
requirements.
► Do not use neither CPL1 nor CPL2 in an electrical path where a failure of CPL1 or CPL2 (for example,
short or open circuits of measurement inputs) causes:
• a voltage regulation feedback loop to become dysfunctional.
• an over-current protection to become dysfunctional.
• an indicator for hazardous live electrical quantities (IEC 61010-1, VDE 0105-100) to become
dysfunctional.
► Ground CPL1 or CPL2 using the shortest path with the lowest achievable inductance. For this
purpose, use the common grounding circuit of the test voltage source, test object and coupling
capacitor.
►The MPD 800 acquisition unit and RBP1 are inherently grounded through the connection cables to
CPL1 or CPL2. Therefore, make sure that the device housings is electrically insulated from ground
potential.
► Place MCU2 in close proximity to the PC and outside of the high voltage or test area (EN 50191).
Make sure that the computer is grounded through protective earth, for example, grounded USB hub.
► It is not recommended to place CPL1 or CPL2 outside of the high-voltage or test area (EN 50191). If
CPL1 or CPL2 is placed outside these areas, perform additional precautions in order to achieve an
equivalent safety level according to safety standards (see 1.2.1 "Safety standards" on page 6).
DANGER
Death or severe injury caused by high voltage or current
► Always observe the five safety rules (see 1.2.2 "Safety rules" on page 6) before
connecting or integrating CPL1 or CPL2 into a system.
► Provide protection against live parts in order to avoid accidental contacts.
► Connect the AC output of CPL1 or CPL2 to the MPD 800 acquisition unit or short-
circuit the AC output because the AC output can have voltages higher than 30 V. The
AC output is limited by a protection circuit.
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