AEMC 6418 User Manual page 20

Impedance measurement:
Quantities of
influence
-4 to 131°F (-20 to
Temperature
Relative
humidity
Supply
voltage
Position of
conductor
Position of
clamp
Proximity to
magnetic
mass against air gap
Magnetic field
50/60Hz
Adjacent
conductor
Leakage
current in the
Z <
grounding
100 Ω
system from
50 to 60Hz
I <10 A. ZxI
<75 V
Ground
inductance
20
Range of
influence
+ 55 °C)
10 to 90% RH
4 to 6.5 V
from the edge to
the center
+/- 180°
Sheet steel
1mm thick
30 A/m
I < 40A
Z x I <
20 V
20 V ≤ Z x
I < 40 V
40 V ≤
Z x I
Z ≥ 100 Ω
0 to 500 µH
Typical
0.5 δ / 10°C ± ct
1 δ ± ct
0.05 δ ± ct
Z < 450 Ω Z ≥ 450 Ω
0.2 δ ± ct
0.5 δ ± ct
Z < 450 Ω
Z ≥ 450 Ω
0.25 δ ± ct 0.5 δ ± ct
0.1 δ ± ct
0.05 δ ± ct
Z < 250 Ω
Z ≥ 250 Ω
0.25 δ ± ct
0.4 δ ± ct
0.5 δ ± ct
1 δ ± ct
2 δ ± ct
0.5 δ ± ct
Instrument displays Z at measurement frequency
Clamp-On Ground Tester Model 6418
Influence
Maximum
1.5 δ / 10°C + ct
2 δ ± ct
0.1 δ ± ct
Z < 450 Ω
0.4 δ ± ct
Z < 450 Ω
0.5 δ ± ct
0.5 δ ± ct
0.1 δ ± ct
Z < 250 Ω
0.5 δ ± ct
1 δ ± ct
3 δ ± ct
4 δ ± ct
1 δ ± ct
(2083Hz)
Z ≥ 450 Ω
1 δ ± ct
Z ≥ 450 Ω
1 δ ± ct
Z ≥ 250 Ω
0.8 δ ± ct