LEM HEME ISO 1000 Manuel D'utilisation page 33

Technical Data
Insulation Test R measurement
ISO
Measuring method: Current,- voltage measurement complying EN 61557 – 2
Nominal test voltage: U = 100V, 250V, 500V, 1000V DC
N
Open circuit voltage: U < 1.1 x U
0 N
≥ 1mA DC at U
Nominal current: I
N
Short circuit current: <10mA DC
Resolution
Range
1.8kΩ...2 G 0.1kΩ...1MΩ ±(1% of measured value + 3D)
±(3% of measured value + 3D)
2GΩ...20GΩ 10MΩ
Continuous measurement (log) and output via RS232
possible.
Display of the measuring current I .
ISO
Calculation of Polarisation Index I and Dielectric Absorption Ratio R
P
R after pre-defined time interval:
ab
I = R (10min)/ R
P ISO ISO
R = R (1min)/ R
ab ISO ISO
In case of external voltage of >10% of U
is not started (safety interlock).
Resistance R measurement
Measuring method: Current,- voltage measurement complying EN 61557 – 4
Open circuit voltage: U ≥ 4V
0
Short circuit current: I >200mA up to 2Ω according to EN61557
k
Range Resolution Intrinsic Error
±(1% of measured
0.2Ω...20Ω 0.01Ω
value+3D)
20Ω...200Ω 0.1Ω
200Ω...2kΩ 1Ω
±(1% of measured
value+2D)
2kΩ...20kΩ 10Ω
20kΩ...200kΩ 100Ω
In case of external voltage display of >3V the measurement with 200mA is not
started after selecting rotary switch position.
SMR Serial mode rejection approx. 60dB at 50 and 60Hz
CMR Common mode rejection approx. 80dB at 50 and 60Hz
Test lead compensation possible (ZERO) compensation resistance R
N
Intrinsic Error Operating error
±(2% of measured
value+4D)
±(4% of measured
value+4D)
ab
(1min)
(30sec)
the measurement
N
Operating error
±(2% of measured value + 5)
±(2% of measured value + 3)
.
K
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