Promax PE-335, Руководство пользователя

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USER’S MANUAL. PE-335
07/2015 Page 7
4. MEASURING METHODS
BEFORE PROCEEDING MEASUREMENT, READ SAFETY
RULES ON PAGE 3.
1. In proceeding with measurement, if
+
-
symbol appears on the display, replace
with new batteries in order to avoid wrong measurements.
2. Precision earth resistance measurement method:
(1) Connect green, yellow and red test leads to instrument terminals E, P and C
with auxiliary earth spikes P1, C1 stuck into earth "IN A STRAIGHT LINE".
(Fig. 1).
(2) Rotary to function switch to EARTH VOLTAGE position and press TEST
ON/OFF to test. Earth voltage will displayed on the LCD. When earth voltage
is more than 10 V, it may result in errors in earth resistance measurement.
Accurate earth resistance measurement may not be made, location of spikes
must be checked.
En
g
lis
h
(3) Rotary the function switch to suitable range then press the pushbutton press
TEST ON/OFF to test and take the reading.
Figure 1.-
3. Simplifted earth resistance measurement method:
(1) This method is recommended where an earth resistance higher than 10
Ω
is
measured or where it is not possible to drive auxiliary earth spikes. An
approximated value of the earth resistance can be obtained by means of using
the double wiring method shown in the figure 2).
(2) Rotary to function switch to EARTH VOLTAGE position and press TEST
ON/OFF to test. Make certain that earth voltage is less than 10 V.