Hioki 3143 User manual

EARTH HiTESTER 3143, 3151
Ground resistance meter
Say goodbye auxiliary grounding
rods with the 3143.
Measure even on paved roads.
3-electrode measurement on the 3151 gives greater precision!
Tangle-free

2
The 3143 requires no auxiliary grounding rods,
making measurement easy.
Using the 3143
1. Wire as shown in the diagram.
2. Turn the rotary knob to measure.
As the rotary knob is turned, the lowest resistance value that is
displayed is the grounding resistance value.
Presenting a next-generation ground
resistance meter
Grounding is increasingly important for the safe operation
and maintenance of communications equipment and many
other types of facilities. However, in an urban environment
where the ground is covered with concrete or asphalt,
conventional measurement methods that require inserting
auxiliary grounding electrodes are difficult to use. The
3143 uses a new measurement principle that makes
auxiliary grounding electrodes unnecessary, so it can
be used to measure ground resistance on paved roads.
Easy-grip elastomer knob
Bar graph display makes it easy to find measured resistance.
Turn the rotary knob so that the graduations are centered.
Dust-resistant
switch
Large, easy to read LCD display
Convenient Features
Rx
String along the
ground (20m)
EarthReturn
Common ground resistance meters such as the 3151 measure the
resistance using a frequency between 500 Hz and several kHz.
The 3143 uses a frequency between 100 kHz and 1.5 MHz, close
to that of a lightning surge. Therefore, measurement errors can
result if the 3143 is used in situations such as the following. In
these instances, we recommend using Model 3151.
• Electricalgroundingormeshgrounding.
• Electricalpowerequipmentgrounding.
• Whenthemeasurementpointislocatedatadistancefromthe
insertion point of the grounding electrode.
Differences from the Previous Instrument (Model 3151)
The 3143 obtains ground resistance Rx by measuring the loop
impedance of the closed path that goes from the lead wire to
earth, then back to a return line which is strung along the surface
of the earth.
The drawing below shows an equivalent circuit, where Rx is
the ground resistance of the object being measured, C is the
capacitance of the return wire relative to ground, and L is the
inductance of the measurement cable.
By varying the frequency of the measurement signal source so
that LCR is serially resonant, the ground resistance Rx can be
determined as follows.
Rx = Vm / (Vc - Vm) ×Ro
Here, Vc is the signal source voltage, Vm is the voltage between the
measurement terminals, and Ro is the signal source output resistance.
Withthe3143youturnthemeasurementknobtovarythesignal
source frequency. As the knob is turned, the smallest value
that appears (the value at the resonance point) is the ground
resistance value Rx.
Measurement Principle of the 3143
Features
■Auxiliary grounding rods are unnecessary, greatly
reducing time and effort.
Measurement can be done easily on concrete or asphalt
pavements.
■Measurements are easy to read.
A large digital display shows measured values.
■Resistant to dirt.
Dust resistance of parts such as the power switch and
measurement dial has been increased and durability has been
improved.
The 3143 is most appropriate for measuring the ground
resistance of an individually grounded rod-shaped
electrode.
Lead
Wire
Return Wire
Ground
Ground being
measured
Equivalent Circuit At Resonance
3143

3
Count on The 3151 for Dependable Measurements
EC
Rx
Ro
5 M
minimum
AC 250 V max
Simple Measurement (2 Electrode Method)
1. Wire as shown in the diagram. (Example of power
supply grounding line connection)
2. Set the 2/3 electrode method switch to 2 electrode
measurement.
3. Check for grounding voltage in the grounding voltage
range.
4. Take measurements, choosing either ×10 or ×100.
 Whilepressingthemeasurementbutton,turntheresistance
dial knob and read the resistance when the galvanometer
reaches a balance. (Measured value = Rx + Ro.)
Using the 3151
Normal Measurement (3 Electrode Method)
1. Wire as shown in the diagram.
2. Set the 2/3 electrode method switch to 3 electrode
measurement.
3. Check for grounding voltage in the grounding voltage
range.
4. Check the auxiliary grounding resistance values for C
and P in the auxiliary grounding resistance range.
5. Measure using the appropriate resistance range.
 Whilepressingthemeasurementbutton,turntheresistance
dial knob and read the resistance when the galvanometer
reaches a balance.
5~10m
Rx
E
P
CE P C
5~10m
■Wide measurement range
Take measurements to 115% of the measurement range.
■More stable measurement
 Easily check the grounding condition of auxiliary grounding
rods for better accuracy. Further, the measurement frequency
switching lets you avoid influences such as that of high
frequency grounding current.
■Simple measurement feature
Switch between "normal" and "simple" measurement modes
with the press of a button.
■Overvoltage protection and alarm feature
If wires are incorrectly connected (as often happens during
simple measurement of commercial power supplies), safety is
provided by an alarm buzzer and overvoltage protection.
■Resistant to dirt
Parts such as the measurement switches and measurement dial
have increased dust resistance and durability.
■More convenient accessories
A cable winder ensures freedom from cable tangles, and a
convenient carrying case accommodates all measurement
materials.
Features
The 3151 is a Standard Ground
Resistance Meter
Ground resistance measurement involves factors that are
not encountered during ordinary resistance measurement,
such as polarization of the earth, the influence of grounding
current due to leak current and grounding voltage, and the
influence of auxiliary grounding resistance. The 3151 is
able to make more accurate measurements more safely
under difficult conditions because it uses the alternating
current potentiometer method to provide measurement
accuracy, and because it contains features such as
an auxiliary grounding resistance check feature and
measurement frequency switching.
Accessories for Greater Convenience
• Convenient cable winder for total away the
measurement cable.
• Carrying case holds everything for total portability.
Auxiliary resistance (P/C) check feature
Check the ground condition of auxiliary grounding resistance,
which can cause measurement error.
Measurement method and frequency switching switches
Push a button to select simple measurement (two electrode method).
And, a feature to select the measurement frequency in order to reduce the influence
of grounding voltage or grounding current due to high power supply frequency.
The resistance measurement is
increased to 115% of range
High durability
measurement switches
with dust-resistant
construction
Shock resistant taut
band meter
Overvoltage protection and alarm buzzer
Prevents damage due to incorrect connection during simple measurement
(commercial power supply grounding), and warns of incorrect connection by buzzer.
Easy-grip elastomer knob
Convenient Features

HEADQUARTERS
81 Koizumi, Ueda, Nagano, 386-1192, Japan
TEL [phone] FAX [phone]
http://www.hioki.com / E-mail: [e-mail]
HIOKI USA CORPORATION
TEL [phone] FAX [phone]
http://www.hiokiusa.com / E-mail: [e-mail]
All information correct as of Oct. 1, 2013. All specications are subject to change without notice. 3143E9-5YE Printed in Japan
DISTRIBUTED BY
HIOKI (Shanghai) SALES & TRADING CO., LTD.
TEL [phone] FAX [phone]
http://www.hioki.cn / E-mail: [e-mail]
HIOKI INDIA PRIVATE LIMITED
TEL [phone]
E-mail: [email protected]
HIOKI SINGAPORE PTE. LTD.
TEL [phone] FAX [phone]
E-mail: [e-mail]
HIOKI KOREA CO., LTD.
TEL [phone] FAX [phone]
E-mail: [e-mail]
Note: Company names and Product names appearing in this catalog are trademarks or registered trademarks of various companies.
3151 Specifications3143 Specifications
●Influence of auxiliary grounding resistance:
± 5% for a fluctuation of 0 to 5 kΩ
●Influence of grounding voltage:
± 2% for 0 to 5 V
± 5% for 0 to 10 V (for 50/60 Hz)
± 5% for 0 to 3 V (for DC, 162/3, 400 Hz)
●Influence of power supply voltage:
within nominal deviation for DC 6 to 10 V
●Operating method: AC potentiometer method
●Open circuit voltage: AC 50V max
●Measurement current:
AC 15 mA max (AC 3 mA max when using the two electrode method)
●Measurement frequency:
575 Hz (with 3a or 2a selected) or 600 Hz (with 3b or 2b selected)
●Operating temperature and humidity:
0to40˚C,80%rhmaximum(nocondensation)
●Storage temperature and humidity:
-10to50˚C,80%rhmaximum(nocondensation)
●Applicable standards:
• Safety:EN61010,Measurement Category II, Pollution Degree 2
•EMC:EN61326
●Environment protection:IP40(EN60529)
●Overvoltage protection:
AC250V,1minute(betweenE-P(S),E-C(H)terminals)
●Power supply:
R6P manganese battery ×6, or LR6 alkaline battery ×6
●Operating time: Approx 350 operations (using R6P battery)
Approx 1100 operations (using LR6 battery)
(30 seconds measurement / 30 seconds off condition)
●Dimensions and mass:
164(W)×119(H)×88(D)mm(notincludingprotrusions),
800g(mainunitonly)
●Accessories:
AUXILIARY GROUNDING RODS 9214 ×2
MEASURING CABLE 9215
(black 5 m, yellow 10 m, red 20 m, one each; cable winder ×3)
PORTABLE CASE 9393 ×1
Instruction manual ×1
●Optional accessory
EARTH NETS 9050 (set of two)
Use in places where auxiliary grounding rods cannot be inserted
(but where water can penetrate)
●Display: 4-digitLCD,valuesabove999.9Ωdisplayed as "OF"
●Influence of grounding voltage: ± 5% rdg. for 0 to 10 V
●Principle of operation: voltage comparison method
(Measurement of voltage at loop impedance serial resonance)
●Open circuit voltage: AC 1 Vp typ
●Measurement current:AC3.6mAmax(Withterminalsshorted)
●Measurement frequency: 100 kHz to 1.5 MHz
●Features:
•Energysavingmode:after3minuteswithnooperation,displays
"HOLD" and enters the standby state
•Resonanceindicator:bargraphindicatorshowsapproximatelocation
of resonance point
•Batterycheck:batterylightflasheswhenthepowersupplyvoltage
drops
●Operating temperature and humidity:
0to40˚C,80%rhmaximum(nocondensation)
●Storage temperature and humidity:
-10to50˚C,80%rhmaximum(nocondensation)
●Applicable standards:
• Safety:EN61010,MeasurementCategoryI,PollutionDegree2
•EMC:EN61326
●Power supply: LR6 alkaline battery ×4
●Operating time:8hourscontinuous(23˚Creferencevalue)
●Dimensions and mass:
155(W)×98(H)×49(D)mm(notincludingprojections),
380g(mainunitonly)
●Accessories:
MEASURING CABLE 9265
(black 1 m, red 20 m, one each; cable winder ×1)
PORTABLE CASE 9338 ×1
Instruction manual ×1
(Temperatureandhumidity:23˚C±5˚C,80%rhmaximum)
(100Ω/1000Ωranges only with 2 electrode measurement)
(Temperatureandhumidity:Withinratedoperatingtemperatureandhumidityrange.)
Measurement
Item Measurement Range Accuracy
Grounding
Resistance
20.0 to 49.9 Ω± 10% rdg.
50.0 to 500.0 Ω± 5% rdg.
Measurement
Item Measurement Range Nominal Deviation
Grounding
Resistance
10 Ω(0 to 11.5 Ω) ± 2.5 % f.s.
100 Ω(0 to 115 Ω) ± 2.5 % f.s.
1000 Ω(0 to 1150 Ω) ± 2.5 % f.s.
Grounding
Voltage 30 V (0 to 30 V) ± 3.0 % f.s.