Measurement Of Alternating Voltage; Checking Correctness Of Pe (Protective Earth) Connections; Measurement Of Fault Loop Parameters - Sonel MZC-305 Operation Manual

2.3

Measurement of alternating voltage

The meter measures and displays alternating mains voltage before the measurement. This
voltage is measured for the frequencies within the range of 45...65 Hz. The test leads should be
connected as for a given measuring function.
2.4

Checking correctness of PE (protective earth) connections

Note:
When a dangerous voltage is detected on PE conductor, measurements must
be immediately stopped and a fault in the installation must be removed.
- The person making a measurement must ensure that he/she is standing on a non-insulated floor
during the measurement; otherwise the result of the measurement may be incorrect.
- The threshold value, which triggers the signal of exceeded allowable voltage on PE conduit, is
approximately 50 V.
- In the Z and
L-PE L-PE
measuring terminals of the meter (L,N,PE), the "PE" alarm will be generated when the contact
electrode is touched.
When in the Z and Z
L-PE
the meter's L and N terminals), the "PE" alarm may be triggered when the contact electrode is
touched, but sometimes this does not happen (this depends, among other things, on the floor
resistance, mains voltage, footwear, etc.).
2.5

Measurement of fault loop parameters

If there are residual current devices in the tested network, they should be bypassed by
bridging for the period of impedance measurement. However, it should be remembered
that the tested circuit is modified in this way and the obtained results may slightly differ
from the actual results.
Each time after completion of measurements, modifications introduced to the installation
for the period of measurements should be removed and operation of the residual current
device should be checked.
The above remark does not apply to measurements of short circuit loop impedance with
the use of the Z
L-PE
8
When the meter is connected as in the the
drawing, touch the contact electrode with your
finger and wait for about 1 second. When
PE or
voltage if found on PE, the meter displays the
symbol (error in the installation; PE connected to
the phase conductor) and generates a
continuous audio signal. This option is available
for the Z
RCD functions, when only the phase conductor is connected to one of the
RCD functions only L and N conductors are connected (respectively to
L-PE
RCD function.
OPERATING MANUAL MZC-305 version 1.08
measurements.
L-PE
WARNING: