Top Tronic T1805 User manual

EARTH RESISTANCE TESTER
T1805
INSTRUCTION MANUAL

INDEX
1. INTRODUCTION.....................................
2. SAFETY NOTES.....................................
3. FEATURES..............................................
4. SPECIFICATIONS...................................
5. MEASURING METHODS.......................
6. MAINTENANCE......................................
Page
1
2
3
4
5-6
7-8

-1-
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.

-2-
2. SAFETY NOTES
Read the following safety information carefully before●
attempting to operate or service the meter.
Use the meter only as specied in this manual; ●
otherwise the protection provided by the meter may be
impaired.
Rated environmental conditions:●
(1). Indoor use.
(2). Installation Category Ⅲ. 150V
(3). Pollution Degree 2.
(4). Altitude up to 2000 Meter.
(5). Relative Humidity 80% Max.
(6). Ambient Temperature 0~40ºC.
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.

-3-
3. FEATURES
High quality Taut Band movement.●
Capable of measuring earth voltage.●
2mA measuring current permits earth resistance test●
without tripping earth leakage current breakers in the
circuit under test.
In addition to the facility for precision measurement,●
test leads for simplied two wire measuring system also
supplied as standard accessories.
Battery operated.●
Battery life indicator.●
Designed to meet IEC-1010(EN 61010)safety standard.●

-4-
4. SPECIFICATIONS
Measurement System:●
Earth Resistance by constant current inverter 820Hz,
2mA approx.
Measuring Ranges:●
Earth resistance:10/100/1000Ω
Earth voltage: 0~30V AC(40~500Hz)
Accuracy:●
Earth Resistance: 3% of full scale
Earth voltage: 2.5% of full scale
Safety standard:●
IEC-1010(EN 61010), Installation Category Ⅲ. 150V
Power Source:●
(R6P)1.5V x 8 pieces or equivalent
Dimensions:●
170(L) x 165(W) x 92(D) mm
Weight:●
Approx. 1000g(battery included)
Accessories:●
Test leads (red-15M, yellow-10M, green-5M)
Auxiliary earth spikes
Simplied measurement probe
Instruction manual

-5-
5. MEASURING METHODS
BEFORE PROCEEDING WITH MEASUREMENT, READ
THE SAFETY NOTES ON PAGE 3.
Check to see if the meter pointer is adjusted exactly1.
to the mechanical zero position of the W or V scale.
If the pointer is off the zero position, turn the zero
adjust screw with a screwdriver.
Rotary the function switch to "BATT CHECK" Position2.
and press to test. Battery voltage is sufcient when
the meter pointer stays in "OK" area of the battery
check scale. If not, replace with the new batteries.
Rotary the function switch to "EARTH VOLTAGE"3.
position and press to test. Earth voltage will be
indicated on the ACV scale. When earth voltage
is more than 10V, it may result in errors in earth
resistance measurement. Accurate earth resistance
measurement may not be made.
Precision earth resistance measurement method:4.
(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)
Fig. 1

-6-
(2) Rotary the function switch to suitable range then
press the pushbutton to test and take the reading.
Simplied earth resistance measurement method:5.
(1) This method is recommended where an earth
resistance higher than 10W is measured or where
it is not possible to drive auxiliary earth spikes.
An approximate value of earth resistance can be
obtained by the two wire system where is shown in
Fig.2.
(2) Rotary the function switch to "EARTH VOLTAGE"
position and press to test. Make certain that earth
voltage is less than 10V.
(3) First rotary the function to "x10" position and press
to test, read earth resistance. If the meter pointer
indicates over full scale, switch to "x100" position
and read earth resistance.
(4) The reading obtained (Re) is an approximate earth
resistance value. There is no need for external
shorting as P and C terminals are shorted by
using the test leads specied for the simplied
Measurement.
Fig. 2

-7-
(5) Rx = Re -re
Rx = True Earth Resistance
Re = Indicated Valuere
re = Earth Resistance of Earth Electrode.
(6) Since measuring current is as low as 2 mA, the
earth leakage breaker (ELCB) does not trip even if
the earth side of the commercial power supply with
an ELCB is used.
* Follow the proper connection such as Fig. 1, the
LED(red) indicator will lit. This proves a correct current
circulation is under its operation.

-8-
6. MAINTENANCE
Battery Replacement:●
When setting the function switch to "BATT CHECK"
Position and the meter pointer NOT staying in OK
Area, 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.
Cleaning and storage:●
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.
WARNING
To avoid electrical shock or damage to the meter,
do not get water inside the case.