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NEPTUNE
EN - 17
5.6. MEASUREMENT OF INSULATION RESISTANCE
This function is performed in compliance with standard IEC/EN61557-2 and allows
measuring insulation resistance in electric installations and industrial applications where it
is necessary to carry out duration tests (see § 9.2). The following operating modes are
available:
AUTO
the test continues until a stable result is obtained (minimum duration 3s, max
15s) or until key
GO/HOLD
is pressed. Recommended mode
TMR
the test is carried out in a continuous mode for the duration (timer) set, among
the values:
15s, 30s, 1min, 5min, 10min
PI
the test is carried out in a continuous mode for the duration (timer) set, among
the values:
1min,10min
. If the set time is
1min
, the instrument will display the
value of parameter
DAR
(Dielectric Absorption Ratio) (see § 9.2.2).
1min,10min
. If the set time is
10min
, the instrument will display the value of
parameter
PI
(Polarization Index) (see § 9.2.1).
AUTO mode
CAUTION
Check that the circuit being tested is not live and that all possible loads
normally connected to it are disconnected before carrying out insulation
measurement.
We recommend holding the alligator clip respecting the safety area created
by the hand protection.
Fig. 15: Use of the instrument for insulation resistance measurement in AUTO mode
1. Select position
M
2. Press key
MODE/MXMNPK
and select option
“
AUTO
”
3. Press key
V
TEST
/LIM
to set the test voltage choosing among the values:
50V, 100V,
250V, 500V, 1000VDC.
Please note the value in the top part of the display.
4. Press and hold key
V
TEST
/LIM
(>2s) to set the
minimum
limit threshold for
measurement. The symbol
“
Set
”
flashes on the display.
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