Fluke 1623 FE 1623 Users Manual - Page 23

Is the result of a Stakeless ground loop measurement, reliable?, Troubleshooting

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Earth/Ground Tester Troubleshooting conditions (depending mainly on the soil resistivity) this may not suffice. To be sure reposition the probes and take several measurements. If the readings are approx. the same your measuring results are reliable, if not increase the probe distance. 6 Is the result of a "Stakeless ground loop measurement" reliable? Ensure that you are using the correct inducing clamp (see "Recommended Accessories")! The clamp's parameters are suited for this test method. Using an undefined clamp will render incorrect results. Ensure that the recommended minimum distance between the current clamp is kept. If the clamps are positioned too close together, the magnetic field of the inducing clamp will influence the sensing current clamp. To avoid mutual influencing, the distance between the clamps can be varied and a new test performed. If the measurement values vary only a little or not at all, the value can be regarded as reliable. 1 U ext >Limit 2 E SH H >Limit E ES S H 3 S >Limit 4 E ES S H E SH FLUKE 1623 max 50 V P2 S plus FLUKE E/C1 S/P2 H/C2 >20 m >20 m 5 Us Ug Figure 9. Troubleshooting edv008.eps 15

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Earth/Ground Tester
Troubleshooting
15
conditions (depending mainly on the soil resistivity) this may not
suffice. To be sure reposition the probes and take several
measurements. If the readings are approx. the same your measuring
results are reliable, if not increase the probe distance.
6
Is the result of a “Stakeless ground loop measurement”
reliable?
Ensure that you are using the correct inducing clamp (see
“Recommended Accessories”)!
The clamp’s parameters are suited for this test method. Using an
undefined clamp will render incorrect results.
Ensure that the recommended minimum distance between the
current clamp is kept. If the clamps are positioned too close together,
the magnetic field of the inducing clamp will influence the sensing
current clamp. To avoid mutual influencing, the distance between the
clamps can be varied and a new test performed. If the measurement
values vary only a little or not at all, the value can be regarded as
reliable.
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edv008.eps
Figure 9. Troubleshooting