AEMC 6418, User Manual

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