MPI-520 OPERATING MANUAL version 3.4
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 cir-
cuits, 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
damage 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 measur-
ing functions except R
E
, R
X
, R±200mA, R
ISO
-conductor. For
and R
ISO
functions, only voltage is
displayed. 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
frequency 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 con-
nected 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
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