Metrix MX 435D - Page 52

Chapter II
48 Digital Earth Tester
TYPICAL INFLUENCE OF PARASITE VOLTAGE IN EARTH MEASUREMENTS
20 Ohm Range
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
0 5 10 15 20
Parasite voltage (V) 16 2/3 Hz to 60 Hz
Measurement error %
Ra = 1 Ohm
Ra = 10 Ohm
2000 Ohm Range
0
1
2
3
4
5
6
7
8
0 5 10 15 20
Parasite voltage (V) 16 2/3 Hz to 60 Hz
Measurement error %
Ra = 10 Ohm
Ra = 100 Ohm
from 16 2/3 Hz to 60 Hz
from 16 2/3 Hz to 60 Hz