METREL MI 3290 - Page 95

MI 3290 Earth Analyser Tests and Measurements
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Test can be started from the Impulse measurement window. Before carrying out a test the
parameters (Distance and Limit (Zp)) can be edited.
Figure 11.50: Impulse measurement menu
Test parameters for Impulse:
Distance (r)
Distance between E and S probe (user defined).
Distance (R)
Distance between E and auxiliary earth rod H (user defined).
Limit (Zp)
Limit value selection: [OFF, 1 Ω – 100 Ω]
Impulse Measurement procedure:
 Select the impulse Measurement function.
 Set the test parameters (distance and limit).
 Connect the test leads to the instrument and to the test object.
 Press the Run key to start the measurement.
 Wait until the test result is displayed on the screen.
 Save results (optional).
Figure 11.51: Example of Impulse measurement result
Notes:
 Consider displayed warnings when starting the measurement!
 High noise currents and voltages in earth could influence the measurement results. The
tester displays the “noise” warning in this case.
Notes (Probes):
 High impedance of S and H probes could influence the measurement results. In this
case, “Rp” and “Rc” warnings are displayed. There is no pass / fail indication in this
case.
 Probes must be placed at sufficient distance from the measured object.