MPI-520 – USER MANUAL
3 Measurements
Remarks:
- A progress bar is displayed during long measurements.
- The content of this chapter should be thoroughly familiarized with since it describes the meter circuits,
the methods of measurements and basic principles concerning interpretation of measurement results.
- Result of the latest measurement is remembered by the meter until a next measurement is started or
measurement settings are changed or the measuring function is changed by means of the rotary switch
or the meter is switched off. The result of the latest measurement is displayed on the screen for 20
seconds. It can be recalled by pressing ENTER push-button.
WARNING:
During measurements (short circuit loop, RCD), earthed parts and parts accessible in
the electrical installation being tested must not be touched.
WARNING:
During a measurement, switching of the range switch is forbidden because it may dam-
age the meter and pose a threat to the user.
3.1 Measurement of alternating voltage and frequency
The meter measures and displays alternating voltage and frequency of the network in all measuring
functions except R
E
, R
X
, R±200mA, R
ISO
-conductor. For
and R
ISO
functions, only voltage is dis-
played. This voltage is measured for the frequencies within the range of 45..65 Hz as True RMS. If a
frequency measured is outside the specified range, a proper message is displayed instead of the fre-
quency value: f<45 Hz or f>65 Hz. Voltage is displayed as the main result only for U
L-N,L-L
, Z
L-N,L-L
, U
L-PE
Z
L-PE
and U,I,P,Q,S,f,cosφ functions for Only U mode selected. The test leads should be connected as
for a given measuring function.
3.2 Checking correctness of PE (protective earth) connections
When the meter is connected according to the drawing, touch the touch electrode with a finger and
wait for about 1 second. When voltage if found on PE, the device displays PE! message (error in the
installation; PE lead is connected to the phase lead) and generates a continuous audio signal. This
possibility is available for all measuring functions that apply to residual current devices (RCD) and short
circuit loop.
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