User's Manual Esc - ILLKO ESC 2051 User Manual

User's Manual ESC 2051
The main advantage of the method is accuracy of measurement and the possibility of testing
such equipments, which are connected with ground not only by means of PE conductor.
L
N
kontrolovaný spotřebič
mA
Fig. 17
The main disadvantage of the method is that test voltage is not present behind
electrically/electronically controlled switching element (if such element is inside tested
equipment – e.g. electromagnetic contactor, solid state relay etc.). In fact only circuits placed
before such switching element are tested and only leakage current of circuits placed before
such switching element is displayed.
If operator doesn't know the diagram of tested equipment's mains part, it is advised to use
other measurement method.
PE current during operation, touch leakage current
This method simulates perfectly standard operating conditions of tested equipment. The
equipment is powered; thus it runs. PE current is measured if you test protective class I
equipment (Fig. 18).
If you test protective class I equipment with exposed conductive parts, which are not
connected with protective conductor, or protective class II equipment, you can measure touch
leakage current (Fig. 18). You touch exposed parts with test tip and current which flows via
measuring instrument (with 2 kΩ shunt built in) is displayed.
Exposed conductive parts of equipment under test must not be connected to potential of
ground; otherwise measurement results could be incorrect!
The ESC 2051 measures even DC component of leakage current, if PE current during
operation function is used!
Measurement must be executed two times – with normal L-N connection and with
interchanged L-N. The reason is that leakage current can "spread out" asymmetrically versus
its power voltage.
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