MI 3290 Earth Analyser
Tests and Measurements
78
Test can be started from the Selective (Iron Clamp) measurement window. Before carrying
out a test the following parameters (Test Mode, Clamp Type, Test Frequency, Distance and
Limit (Zsel)) can be edited.
Figure 11.21: Selective (Iron Clamp) measurement menu
Test parameters for Selective (Iron Clamp):
Test Mode
Set test mode: [single, sweep]
Test
Frequency*
Set test frequency: [55 Hz, 82 Hz, 94 Hz, 105 Hz, 111 Hz, 128 Hz, 164 Hz,
329 Hz, 659 Hz, 1.31 kHz, 1.50 kHz]
Clamp type
Set clamp type: [A1018]
Distance (r)
Distance between E and S probe (user defined).
Distance (R)
Distance between E and auxiliary earth rod H (user defined).
Limit (Zsel)
Limit value selection: [
OFF, 0.1 Ω – 5.00 kΩ]
*single test mode only.
Selective (Iron Clamp) Measurement procedure:
Select the
Selective (Iron Clamp) measurement function.
Set the test parameters (mode, clamp type, frequency, distance and limit).
Connect the test leads and clamp 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.
Press the cursor keys to toggle between graph view and result view (optional).
Save results (optional).
Figure 11.22: Example of Selective
(Iron Clamp) measurement result
Figure 11.23: Example of Selective
(Iron Clamp) measurement graph view
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.
When measuring at high frequencies use the guard terminal and shielded cable (H).
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 a sufficient distance from the measured object.
