Owner manual

27
# DANGER
The Re measurement cannot be made when a warning message “Voltage
High!!” like shown in Fig.37 appear on the LCD. Voltages more than 15V
exist between the “E” and “S(P)” terminals.
Pressing the “
” Key shifts the display as shown in Fig.38.
The message “Ust=OL V” means the Ust is more than 50V.
To avoid this, make measurements after reducing the earth voltages by
turning off the power supply of the equipment under test etc.
9-1-2 Precise Measurement (4-Wire) *with Earth Test Leads MODEL 7229
The “ES” Terminal is also used with the other terminals used at the 3-wire
Precise measurements. In t
his case, more precise results can be obtained
because auxiliary earth resistances of the measured earth resistances
are excluded, moreover, resistance of the Test Leads connected to the E
Terminal can be canceled.
Terminals to be used : E, ES, S(P), H(C) Terminals
Test Leads : connect to the E, ES, S(P), H(C) Terminals
( the “ES” Test Lead should be connected to the
earthed equipment under test where the “E” Test
Lead is connected.)
Auxiliary Earth Spike : 2 pcs
(1) Setting of Wiring System
Select “Wire (4)” with reference to “8-2-2 Setting for Measurement
Method” in this manual.
Fig.
37
Fig.
38