NOVA and NOVA PRO
Technical specifications
58
7.8
Earth Resistance (only NOVA PRO)
Measuring range according to EN61557-5 is 100Ohm
1999
Ω
.
Re
– Earth resistance, 3-wire, 4-wire
Max. auxiliary earth electrode resistance Rh. ......... 100
RE or 50 k
(whichever is lower)
Max. probe resistance Rs ...................................... 100
RE or 50 k
(whichever is lower)
Rh and Rs values are indicative.
Additional probe resistance error at Rhmax or Rsmax…
(10 % of r 10 digits)
Additional error at 3 V voltage noise (50 Hz) ...................
(5 % of r 10 digits)
Open circuit voltage. ............................................. < 30 VAC
Short circuit current ............................................... < 30 mA
Test voltage frequency .......................................... 126.9 Hz
Test voltage shape ................................................ sine wave
Automatic measurement of auxiliary electrode resistance and probe resistance.
Ro - Specific earth resistance (only NOVA PRO)
Measuring range
Resolution (
Ωm
)
Accuracy
6.0 Ωm … 99.9 Ωm
0.1 Ωm
± (5 % of r 5 digits)
100 Ωm ... 999 Ωm
1 Ωm
± (5 % of r 5 digits)
1.00
kΩm .... 9.99 kΩm
0.01 kΩm
±(10% of read.)for Re 2kΩ…19.99kΩ
10.0
kΩm .... 99.9 kΩm
0.1 kΩm
±(10% of read.)for Re 2kΩ…19.99kΩ
100 kΩm ... 9999 kΩm
1 kΩm
±(20% of read.) for Re > 20 kΩ
Principle:
= 2·
·d·Re, where Re is a measured resistance in 4-wire method and d is
distance between the probes.
Rh and Rs values are indicative.
Measuring range (
Ω
)
Resolution (
Ω
)
Accuracy
1.0
9999
(1.00 ... 19.99)
0.01
(20.0 ... 199.9)
0.1
(200.0 ... 9999)
1
(5 % of r 5 digits)
