Double Clamp Multi-function Grounding Earth Resistance Measurement

Double Clamp Multi-function Grounding Earth Resistance Measurement

Double Clamp Multi-function Grounding Earth Resistance Measurement Ⅰ . Brief introduction HZJD-3002 Double Clamp Multi-function Grounding Resistance Tester specially design for the measurement of earth resistance, soil resistivity, earth voltage, leakage current of grounding line, AC current, DC...

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Double Clamp Multi-function Grounding Earth Resistance Measurement

. Brief introduction

HZJD-3002 Double Clamp Multi-function Grounding Resistance Tester specially design for the measurement of earth resistance, soil resistivity, earth voltage, leakage current of grounding line, AC current, DC resistance. Adopting the latest digital technology, precise 4-pole, 3-pole and simple 2-pole method, selection method, double clamp method  to measure grounding resistance, for earth resistance measurement; large caliber clamp design, can use to measure the grounding system which adopt large-scale down conductor; can flexibly and precisely measure the value of grounding resistance in every complicated situation like single point grounding, grounding mesh; it is not need to disconnect any parallel connection pole when measuring parallel-grounding, and massively improve the convenience when measuring. Importing FFT and AFC technology, with a unique function of anti-interference capability and the ability to adapt to the environment, consistency of repeat testing, to ensure high precision, high stability and reliability for prolonged measure, which is widely used in electric power, telecommunications, meteorology, oil field, construction, lightning protection, industrial electrical equipment and other earth resistance, soil resistivity, earth voltage, AC voltage measurement.

HZJD-3002 Double Clamp Multi-function Grounding Resistance Tester is composed of host machine, monitoring software, testing wires, auxiliary ground pillars, communication wires and others. The large LCD display of host machine is with blue backlight and bar graph indicating that can be seen clearly. At the same time it can store 100 sets of data, fulfilling historical inquiry and online real-time monitoring through monitoring software, dynamic display, and alarm indicator, auto-shut down and with the functions like historical data access, reading, preservation, report forms, printing and so on.

 

. Technical specification

1.Base Conditions and Working Conditions

Influence Quantity

Base Condition

Working Conditions

Remark

Ambient Temp

23±1

-10-40

----

Ambient Humidity

40%-60%

80%

----

Working Voltage

6V±0.1V

6V±1.5V

rCrP

Auxiliary Earth Resistance

100Ω

10kΩ

----

Interference Voltage

None

20V

----

Interference Current

none

2A

 

Electrode Distance when  measuring R

a5d

a5d

----

Electrode Distance when  measuring ρ

a20h

a20h

----

2.General specification

Function

Measure grounding resistance, soil resistivity; Measurement of earth voltage, AC voltage, leakage current of AC current

Power Supply

DC 6V(4.5AH battery, continuous standby for 300 hours )

Backlight

White screen backlight, suitable for dim places

Measuring Mode

Precise 4-pole measurement, 3-pole measurement, simple 2-pole measurement, selection method, double clamp method measure grounding resistance

Measuring Method

2/3/4 pole method: change-pole method, measurement current 20mA Max

Selection method: change-pole method, measurement current 20mA Max

Double clamp method: disconnect mutual inductance method, measurement current 1mA Max

Soil Resistivity: 4-pole measurement (Wenner method)

DC resistance: change-pole method

AC current: mutual inductance method

Earth Voltage: average rectification(between P(S)-ES)

Test Voltage Wave

Sine wave

Test Frequency

128Hz

Short-circuit Test Current

AC 20mA max

Open-circuit Test Current

AC 40V max

Electrode Distance Range

Can be set 1m-100m

Display Mode

4-digital super-large LCD display, blue screen backlight

Measuring Indicator

During measurement, LED flash indicator, LCD countdown display, progress bar indicator 

LCD Frame Dimension

111mm×68mm

LCD Window Dimension

108mm×65mm

Dimension

L×W×H: 277.2mm×227.5mm×153mm

Size of clamp

LxWxH:101mm×27mm×214mm

Standard Test Wire

4 wires: each for red 15m, black 15m, yellow 10m, and green 10m

Simple Test Wire

2 wires: each for red 1.5m and black 1.5m

Auxiliary Grounding Rod

4 wires: Φ10mm×150mm Over 5000 times (Short-circuit test, interval time should be at least 30 seconds)

Clamp

2pc :1 blue-black plug and 1 red-black.

Caliber of clamp

Φ50mm

Turn Ratio

1000 :1

Lead line of clamp

2m

Measuring Rate

AC current: about 2 times/second

Voltage to ground: about 2 times/second

Earth resistance, soil resistivity: about 7 seconds/time

Measuring Times

Over 5000 times (Short-circuit test, interval time should be at least 30 seconds)

Voltage of circuit

AC 600V

USB Interface

USB interface, software supervision, storage data can be uploaded to computer, saved or printed.

Communication Wire

One piece of USB communication wire, with length 1m

Data Hold

Data hold function: “HOLD” icon display

Data Storage

500 sets, “MEM” storage indicator, flash display “FULL” icon to indicate storage is full

Data Read

Data read function: “READ” icon display

Overflow Display

Exceeding measuring range overflow function: “OL” icon display

Low current direction of clamp

When use select method or double clamp to measure, and the current signal A receive is lower than 0.5mA,and”   ” display, then would check the direction of A clamp into

Interference Test

Recognize interference signal automatically, NOISE” icon display when interference voltage exceed 5V

Auxiliary Grounding Test

Can measure auxiliary earth resistance, 0.00KΩ-30kΩ(100R+rC<50kΩ, 100R+rP<50kΩ)

Alarm Function

When measuring value exceeds alarm setting value, there is “Toot-toot-toot” alarm hint

Battery Voltage

When battery voltage decreases to about 7.5V, battery voltage low icon     will display, reminding to replace battery.

Auto-shut off

Automaticlly shut down 15minutes after booting

Power Consumption

Standby: about 25mA Max(Backlight shut off)

Boot 28mA Max(without backlight)

Measurement: about 130mA Max(Backlight shut off)

Weight

Total weight: 8.05kg (including package)

Tester: 2430g (including battery)

Testing wires: 940g

Auxiliary grounding rods: 935g (4pcs)

Working Temperature & Humidity

-10-40, below 80%rh

Storage temperature & humidity

-20-60, below 70%rh

Overload Protection

Earth resistance: between each interfaces of C(H)-EP(S)-ES, AC 280V/3 seconds 

Insulation Resistance

Over 20MΩ (between circuit and enclosure it is 500V)

Withstanding Voltage

AC 3700V/rms. (Between circuit and enclosure)

Electromagnetic Features

IEC61326(EMC)

Protection Type

IEC61010-1 (CAT  300VCAT IV 150VPollution 2), IEC61010-031;

IEC61557-1 (Earth resistance);

IEC61557-5 (Soil resistivity);

JJG 366-2004(Grounding resistance meter)

JJG 1054-2009(Clamp grounding resistance meter)

3.Intrinsic error and performance indicators under base conditions

Function

Measurement Range

Intrinsic Error

Resolution

2/3/4 pole method measure earth resistance

(R)

0.00Ω-29.99Ω

±2%rdg±5dgt

0.01Ω

30.0Ω-299.9Ω

±2%rdg±3dgt

0.1Ω

300Ω-2999Ω

±2%rdg±3dgt

3.00kΩ-30.00kΩ

±2%rdg±3dgt

10Ω

Selection method to measure grounding resistance(R)

0.00Ω-29.99Ω

±2%rdg±5dgt

0.01Ω

30.0Ω-299.9Ω

±2%rdg±3dgt

0.1Ω

300Ω-3000Ω

±2%rdg±3dgt

Double clamp method to measure grounding resistance(R)

0.01Ω-0.99Ω

±10%rdg±10dgt

0.01Ω

1.0Ω-9.9Ω

0.1Ω

10Ω-100Ω

Soil Resistivity

(ρ)

 

0.00Ωm-99.99Ωm

According to the precision of R

(ρ=2πaR

a:1 m-100m,

π=3.14)

0.01Ωm

100.0Ωm-999.9Ωm

0.1Ωm

1000Ωm-9999Ωm

1Ωm

10.00kΩm-99.99kΩm

10Ωm

100.0kΩm-999.9kΩm

100Ωm

1000kΩm-9999kΩm

1kΩm

Earth Voltage(50Hz/60Hz)

AC 0.0-100V

±2%rdg±3dgt

0.1V

AC current(50Hz/60Hz)

0.0mA-1000A

±2%rdg±3dgt

0.01mA

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