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for complete functional testing of medical electrical (ME) devices or systems, additional
measuring and testing devices may be required. e. g. infusion pump testers, defibrillator testers
or patient simulators.
For this purpose, the following measuring methods may be used:
• Differential current measuring method
• Direct current measuring method (direct measuring method)
7.7.8
Cable continuity test
Class I
X
The cable continuity test is intended for measuring the line resistance and is used e. g. for
connecting cables, extension cables and cable reels [} page 91].
The following limits can be set:
• Line length [m] [} page 37]
• Line cross-section [mm²]
• Number of conductors (max. for single-phase test samples)
• R line per conductor [Ω]
The test frequency is 50 Hz.
7.7.9
Safety extra-low voltage
Class I
X
The safety extra-low voltage is measured to check for compliance with the specifications
regarding the rated voltage of test samples with SELV / PELV voltages [} page 92].
• SELV (safety extra-low voltage)
In case of SELV, the conductors of the extra-low voltage side and the body of the test
sample are insulated and not connected to a protective conductor.
• PELV (protective extra-low voltage)
In case of PELV, the conductors of the extra-low voltage side and the body of the test
sample are earthed and connected with a protective conductor.
The test socket is supplied with mains voltage. Exception: Test samples of protection class III.
7.7.10
Voltage of the welding circuit
Class I
-
The voltage of the welding circuit (open-circuit voltage) is tested to check for compliance with
the specifications regarding the rated voltages of test samples according to VDE 0544‑4
[} page 93].
46
EN 50678 (VDE 0701)
EN 50699 (VDE 0702)
Class II
Class III
X
EN 50678 (VDE 0701)
EN 50699 (VDE 0702)
Class II
Class III
X
EN 50678 (VDE 0701)
EN 50699 (VDE 0702)
Class II
Class III
-
BENNING ST 755+ / ST 760+
EN 62353
(VDE 0751‑1)
Class I
-
X
EN 62353
(VDE 0751‑1)
Class I
X
-
EN 62353
(VDE 0751‑1)
Class I
-
-
7.7 Individual tests
EN 60974‑4
(VDE 0544‑4)
Class II
Class I
X
X
EN 60974‑4
(VDE 0544‑4)
Class II
Class I
-
-
EN 60974‑4
(VDE 0544‑4)
Class II
Class I
-
X
5284 / 08/2023 en
Functions
Class II
X
Class II
-
Class II
X
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