Sonel MPI-506 User Manual

MPI-506 – USER MANUAL
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o a short beep if the test voltage is between 90% and 110% of set value.
 Bargraph shows the approximate value of the resistance.
 After completion of measurement, the capacitance of the tested object is dis-
charged by shorting R
ISO
+ and R
ISO
- terminals with resistance of 100 kΩ.
 Save the result in the memory (see section 4.1) or press the ESC button to display
the voltage only. The last measurement result is remembered until you press the
START button or change the rotary switch position.
Additional information displayed by the meter
The tested object is live. The measurement is blocked. Immediately
disconnect the meter from the tested object (both leads)!
Activation of current limit. The symbol displayed is accompanied by a
continuous beep.
The tested object is live. The measurement is possible, but without
guaranteed accuracy.
The insulation resistance is too low, the measurement is terminated.
This symbol appears when during the measurement the insulation
breakdowns.
Measuring range is exceeded.
The tested object is being discharged.
3.6.2 Additional information
The meter measures the insulation resistance by applying to tested resistance R
X
tested voltage
U
ISO
and measuring current I flowing through it, which is controlled from R
ISO
+ terminal side. In calcu-
lating the value of insulation resistance, the meter applies the technical method of resistance meas-
urement (R
X
=U/I). The test voltage is chosen from values: 100 V, 250 V, 500 V.
Inverter output current is limited at 1 mA level. The measurement result is correct, but on the test
terminals the test voltage is lower than voltage selected before the measurement (as illustrated in fig-
ure below). Quite often current limitation may occur in the first phase of the measurement due to
charging the capacity of the tested object.

Sonel MPI-506 Specifications

General

Brand	Sonel
Model	MPI-506
Category	Measuring Instruments
Language	English