19The earth resistance test is a 3-wire test consisting of two test stakes and the earth electrodeunder test. This test requires an accessory stake kit. Connect as shown in Figure 20.• Best accuracy is achieved with the middle stake at 62 % of the distance to the far stake.The stakes should be in a straight line and wires separated to avoid mutual coupling.• The earth electrode under test should be disconnected from the electrical system whenconducting the test. Earth resistance testing should not be performed on a live system.62% LLFigure 20. Earth Resistance Test ConnectionTo measure earth resistance:1. Turn the rotary switch to the position.2. Press and release . Wait for the test to complete.• The primary (upper) display shows the earth resistance reading.• Voltage detected between the test rods will be displayed in the secondary display. Ifgreater than 10 V, the test is inhibited.• If the measurement is too noisy, Err 5 will be displayed. (The measured value accuracyis degraded by the noise). Press the down arrow ( ) to display the measured value.Press the up arrow ( ) to return to the Err 5 display.• If the probe resistance is too high, Err 6 is displayed. Probe resistance may be reduced bydriving the test stakes further into the earth or wetting the earth around the test stakes.Testing Phase SequenceFigure 21. Phase Sequence Display/Switch and Terminal SettingsUse the connection shown in Figure 22 for a phase sequence test connection.