Benning ST 755+ - Cable Continuity Test; Safety Extra-Low Voltage; Voltage of the Welding Circuit

7.7 Individual tests
Functions
5284 / 08/2023 enBENNING ST 755+ / ST 760+46
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
EN50678 (VDE0701)
EN50699 (VDE0702)
EN62353
(VDE0751‑1)
EN60974‑4
(VDE0544‑4)
ClassI ClassII ClassIII ClassI ClassII ClassI ClassII
X X - X X X 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
EN50678 (VDE0701)
EN50699 (VDE0702)
EN62353
(VDE0751‑1)
EN60974‑4
(VDE0544‑4)
ClassI ClassII ClassIII ClassI ClassII ClassI ClassII
X X 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
EN50678 (VDE0701)
EN50699 (VDE0702)
EN62353
(VDE0751‑1)
EN60974‑4
(VDE0544‑4)
ClassI ClassII ClassIII ClassI ClassII ClassI ClassII
- - - - - X X
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].