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9-1-1 Precise Measurement (3-Wire) * with Earth Test Leads MODEL 7229

This is a standard method to measure earth resistances. The measured earth

resistances are free of auxiliary earth resistances but the resistances on the

E terminal are contained.

Terminals to be used : E, S(P), H(C) Terminals

Test Leads : connect to the E, S(P), H(C) Terminals

Auxiliary Earth Spike : 2 pcs, connect to the S(P) and H(C) terminal

(1) Setting of Wiring System

Select “Wire (3)” with reference to “8-2-2 Setting for Measurement

Method” in this manual.

(2) Setting of Rk

1. Firmly insert each plug of 3 test leads (green, yellow, red) to the

corresponding connectors on the instrument.

2. Select the “2Ω” or ”20Ω” Range.

3. Engage 3 Alligator clips to short-circuit all of them.

4. Save the Rk values with reference to “8-2-7 Setting for the residual

resistance on the Test Leads”.

Note) A break in Test Leads or burnout of Fuse is suspected when the

LCD shows “Rk=OL Ω” while 3 Test Leads are being shorted.

(3) Connection of Auxiliary Earth Spikes and Test Leads

Stick the Auxiliary Earth Spikes “S(P)” and “H(C)” into the ground

deeply. They should be aligned at an interval of 5-10m from the earthed

equipment under test. Connect the green Test Lead to the earthed

equipment under test, the yellow Test Lead to the Auxiliary Earth Spike

“S(P)” and the red Test Lead to the Auxiliary Earth Spike ”H(C)”.

(Fig.34)

YellowYellow

Red

Green

Earthed Electrode

under Test

Auxiliary

earth spikes

Fig.

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