9-3 Precision measurement (with MODEL7228A test leads)
(1) Connection
Switch the auxiliary earth spikes P(S) and C(H) into the ground deeply.
They should be aligned at an interval of 5 - 10 m from the earthed
equipment under test. Connect the green wire to the earthed equipment
under test, the yellow wire to the auxiliary earth spike P(S) and the red
wire to auxiliary earth spike C(H) from terminals E, P(S) and C(H) of the
instrument in order.
Fig. 9-8
MODEL7228A(with cord reel)
9-9
Fig. 9-10
Note:
Make sure to stick the auxiliary earth spikes in the moist part of the soil.
Give enough water where the spikes have to be stuck into the dry, stony or
sandy part of the earth so that it may become moist.
In case of concrete, lay the auxiliary earth spike down and water it, or put a
wet cloth etc. on the spike when making measurement.
Use MODEL7228A test leads for
measurement.
Connect the red wire (20m) to C(H)
terminal, yellow wire (10m) to P(S)
terminal and green wire to E terminal.
GreenRed Yello
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