Instruction Manual
Model 309 Digital Earth Resistance Meter
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(2)
(3)
(7)
(8)
(9)
(4)
(5)
(1) Jack For "EARTH" Lead
Connection
(2) Operation Indicator
(3) Data Hold Switch
(4) Timer Off Button
(5) LCD Display
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.
W
(6) Jack For "LINE" Lead
Connections
(7) Function Switch
(8) Ohm Range Switch
(9) Pushbutton Operation
(10)Timer On Button
(10)
1.INTRODUCTION
NOTE
This meter has been designed and tested according to
IEC Publication 348, safety Requirements for
Electronic Measuring Apparatus, IEC-1010 (EN 61010)
and other safety standards. Follow all warnings to
ensure safe operation.
WARNING
READ "SAFETY NOTES" ( NEXT PAGE )
BEFORE USING THE METER.
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2.SAFETY NOTES
Ÿ Read the following safety information carefully
before attempting to operate or service the meter.
Ÿ Use the meter only as specified in this manual.
otherwise, the protection provided by this meter
may be impaired.
Ÿ Rated environmental conditions
(1). Indoor Use.
(2). Installation Category III.
(3). Pollution Degree 2.
(4). Altitude up to 2000 meter.
(5). Relative humidity 80% max.
(6). Ambient temperature 0~40 C
Ÿ Observe the International Electrical Symbols listed
Below
Meter is protected throughout by double
insulation or reinforced insulation.
Warning ! Risk of electric shock.
Caution ! Refer to this manual before using the
Meter.
o
.
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3.FEATURES
Ÿ Capable of measuring earth voltage.
2mA measuring current permits earth resistance
Ÿ
tests without tripping earth leakage current
breakers in the circuit under test.
Battery operated.
Ÿ
Auto power off function. The timer operates auto-
Ÿ
matically about 3~6 minutes when the " PUSH
BUTTON SWITCH" and "TIMER ON BUTTON" are
pressed at the same time to keep the tester power
on.
Data hold function.
Ÿ
Small and light weight.
Ÿ
Designed to meet IEC-1010-1 (EN61010-1) CAT III
Ÿ
200V.
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4.SPECIFICATIONS
Measurement system Earth resistance by constant
Current inverter. 820Hz, 2mA
approx.
Earth voltage 0~200Vac, 40~500Hz.
Earth resistance range and resolution
0~20W (0.01W).
0~200W (0.1W).
0~2000W(1W).
Accuracy Earth voltage ± (1%rdg+2dgt)
Earth resistance ± (2%rdg+2dgt)
or ± 0.1W, which is greater.
Safety standard IEC 1010-1 (EN61010-1) CAT III
200V.
Low battery indication "B" symbol appears on the
display.
Data hold indication "DH" symbol appears on the
display.
Over range indication "1" (MSD).
Timer (auto power off) About 3~6 minutes.
Display LCD 3½ digit (2000 counts).
Power source 1.5V(R6P)*6 pieces dry batteries.
Dimensions 163(L)*100(W)*50(D)mm.
Wight Approx. 410g (battery included).
Accessories Test leads (Red-15m,yellow-10m,
green-5m), Auxiliary earth bars,
Heavy case, Instruction manual.
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5.MEASURING METHODS
BEFORE PROCEEDING WITH MEASUREMENT,
READ THE SAFETY NOTES ON PAGE 2.
1. Connection with test leads
Connect green, yellow and red test leads to instruMent terminals E, P and C with auxiliary earth bars
P1, C1 driven into earth "IN A STRAIGHT LINE".
(Fig.1)
2. Set the function switch to ACV position and make
certain that the voltage reading is LESS THAN
10V AC, otherwise accurate earth resistance
measurement may not be made.
3. Set the Range Switch to suitable range and set the
function switch to W position then press the PUSH-
ON BUTTON and TIMER ON BUTTON at the same
time and take the reading on the display.
ê When none of E, P and C terminals connected
with test leads, the display shows "1" at W function.
ê Follow the proper connection such as Fig. 1, the
LED(red) indicator will lit. This proves a correct
current circulation is under its operation.
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6.MAINTENANCE
Ÿ Battery Replacement
When the symbol "B" appears on the display, replace
the batteries as follows
(1) Disconnect the test leads from the instrument and
turn off the power.
(2) Use a screwdriver to unscrew the screw on back
cover then slide the cover, take out the batteries
and replace with new batteries Type SUM-3.
(3) Place back cover and secure by a screw.
Ÿ Cleaning and storage
WARNING
To avoid electrical shock or damage to the meter,
do not get water inside the case.
Periodically wipe the case with a damp cloth and
detergent do not use abrasives or solvents.
If the meter is not to be used for periods of longer than
60 days, remove the batteries and store them separately.
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