The multi-function ground resistance tester, also known as the ground resistance tester, integrates multiple measurement methods into one advanced instrument. In addition to the traditional function of measuring ground resistance by driving auxiliary ground electrodes, it also features the unique capability of measuring without auxiliary ground electrodes.Through microprocessor control, it precisely measures ground resistance using four-wire, three-wire, simplified two-wire, selective, and dual-clamp methods. The large-diameter current clamp design employs dual-clamp measurement technology, enabling online measurement without the need for auxiliary ground electrodes or isolating the grounding body from equipment. It is widely used in telecommunications, power systems, weather stations, equipment rooms, oil fields, power distribution lines, transmission towers, gas stations, factory grounding networks, lightning rods, etc. The instrument is characterized by accurate, fast, simple, stable, and reliable testing.

The multi-function ground resistance tester is microprocessor - controlled and can accurately measure ground resistance, soil resistivity, ground voltage, DC voltage, DC resistance, and AC current. It uses fast filtering technology to minimize interference. The auxiliary electrode resistance value is displayed on the same screen, making it easy to determine measurement errors caused by environmental factors and ensuring more accurate measurement of the true ground resistance value.It can store up to 500 sets of data and supports Bluetooth connectivity to a mobile app or USB connectivity to a PC for wireless or wired remote measurement, historical data retrieval, and report export. It also features unique functions such as data hold and intelligent alarm prompts.

The multi-function ground resistance tester includes the main unit, PC software, mobile app software, test leads, USB cable, charger, and grounding stakes.

Model

Model	Functions
HZJD-3002E	two/three/four-wire AC ground resistance- Soil resistivity、three/four-wire selective method、Dual-clamp resistance、DC resistance、AC voltage、DC voltage、AC current

III. Range and Accuracy

1．Measurement Ranges, Accuracy, and Resolution

Measurement Function	Range	Accuracy	Resolution
two/three/four-Wire Ground Resistance(Re)	0.000Ω～19.999Ω	±1.5%rdg±70dgt	0.001Ω
	20.00Ω～199.99Ω		0.01Ω
	200.0Ω～1999.0Ω		0.1Ω
	2.000kΩ～19.999kΩ		1Ω
	20.00kΩ～200.00kΩ		10Ω
DC Resistance(R-)	0.000Ω～19.999Ω	±1.5%rdg±70dgt	0.001Ω
	20.00Ω～199.99Ω		0.01Ω
	200.0Ω～1999.9Ω		0.1Ω
	2.000kΩ～19.999kΩ		1Ω
	20.00kΩ～200.00kΩ		10Ω
Selective Method Ground	0.00Ω～20.00Ω	±2%rdg±30dgt	0.01Ω
	20.0Ω～200.0Ω		0.1Ω
	0.200kΩ～3.000kΩ		1Ω
Dual-Clamp Ground Resistance (Re)	0.00Ω～9.99Ω	±10%rdg±10dgt	0.01Ω
	10.0Ω～99.9Ω	±10%rdg±10dgt	0.1Ω
	100Ω～200Ω	±15%rdg±10dgt	1Ω
Soil Resistivity (ρ)	0.00Ωm～99.99Ωm	ρ=2πaR (注2)	0.01Ωm
	100.0Ωm～999.9Ωm		0.1Ωm
	1000Ωm～9999Ωm		1Ωm
	10.00kΩm～99.99kΩm		10Ωm
	100.0kΩm～999.9kΩm		100Ωm
	1000kΩm～9999kΩm		1kΩm
AC Voltage	0.000～9.999V	±1.5%rdg±50dgt	0.001V
AC Voltage	10.00～50.00V	±1.5%rdg±50dgt	0.01V
AC Current	0.00mA～9.99mA	±2%rdg±50dgt	0.01mA
	10.00mA～99.99mA		0.01mA
	100.0mA～999.9mA		0.1mA
	1.000A～9.999A		1mA
	10.00A～99.99A		10mA
	100.0A～999.9A		0.1A
DC Voltage	0.000～9.999V	±1.5%rdg±50dgt	0.001V
DC Voltage	10.00～50.00V	±1.5%rdg±50dgt	0.01V
Temperature Characteristics	Temperature Characteristics: Add specified accuracy × 0.1/°C (when operating outside 18°C to 28°C). Example at 8°C: ±0.2%rdg±10dgt (base accuracy) + 0.1×10 (temperature difference) × (0.2%rdg+10dgt) = ±0.4%rdg±20dgt

Note: 1. Reference Conditions: Accuracy specified when Rh and Rs < 100Ω.
Operating Conditions: Maximum Rh = 3kΩ + 100R < 50kΩ, Maximum Rs = 3kΩ + 100R < 50kΩ

2．Accuracy depends on the measurement precision of R, π = 3.14, a :0.1m–100.0m

2．General Specifications

Ambient temperature and humidity	23℃±5℃, below 75% rh
Interfering voltage	＜20V (should be avoided)
Interfering current	＜2A (should be avoided)
Electrode - to - electrode distance when measuring R	a＞5d
Electrode - to - electrode distance when measuring ρ	a＞20h
Power Supply	11.1V lithium - ion battery (built - in), can continuously measure in AC resistance mode when fully charged for more than 1000 times
Screen brightness	Controllable, users can adjust it according to the scene
Measurement method	Precision four - wire, three - wire method measurement, simple two - wire, selective, dual - clamp method to measure ground resistance
Measurement method details	Two - three - four - wire method measurement: Polarity - changing method, measurement current 42.0mA Max Soil resistivity: Four - pole method Selective measurement: Polarity - changing method, measurement current 42.0mA Max Dual - clamp method: Non - contact mutual induction measurement method, test current 40mA Max DC resistance: Polarity - changing method AC current: Average value rectification (clamp - type) Ground voltage: Average value rectification (between S - ES interfaces) DC voltage: Average value rectification (between S - ES interfaces)
Test voltage waveform	Sine wave
Test frequency	128Hz
Open - circuit Test Voltage	AC 30.0V Max DC 30.0V Max
Electrode Interval Range	0.1m～100.0m
Display Mode	Color - display screen
Instrument Size	Length×Width×Height：277.2mm×227.5mm×153mm
Current Clamp Size	Length×Width×Height：101mm×27mm×214mm
Test Wires	4 pieces: 15m red, 15m black, 10m yellow, 10m green each
Simple Test Wires	2 pieces: 1.5m yellow, 1.5m green each
Auxiliary Grounding Rod	4 pieces: φ10mm×200mm
Current Clamp	Banana plug×1, audio plug×1
Current clamp caliber	φ50mm
Current Clamp Leads	Length 2m
Measurement Time	AC current: about 3 times/second Ground - to - earth voltage: about 3 times/second Grounding resistance, soil resistivity: about 10 seconds/time
USB Interface	Has a USB interface, and stored data can be uploaded to a computer through software
Bluetooth Connection	Yes, real - time monitoring, data reading and other functions can be carried out on a mobile phone
Data Line	USB communication line, 1.5m
Data Storage	500 groups, "FULL" symbol indicates that the storage is full
Overflow Display	Over - range displays "OL" symbol
Auxiliary Grounding Test	Has the function of auxiliary grounding resistance test, 0.00kΩ～200.00kΩ
Alarm Function	An alarm is issued when the measured value exceeds the set alarm value (buzzer alarm)
Automatic Power off	“APO” indicator, automatic power off after 15 minutes (default)
Power Consumption	Screen brightness: 190mA Max(maximum brightness) 140mA Min(minimum brightness)
Power Consumption	Measurement: 200mA Max(maximum brightness) 150mA Min(minimum brightness)
Weights	instrument： 1975g(include battery)
	current clamp：940g(2 pcs)
	test lead：1300g(includes simple test lead)
	auxiliary grounding rods：850g(4 rods)
Working temperature and humidity	-10℃～40℃；80%rh or below
Storage temperature and humidity	-20℃～60℃；70%rh or below
Over-load Protection	Measurement of ground-to -earth voltage: H - E, S - E (port - to - port) AC 280V/3 seconds
Insulation Resistance	20MΩ or above (between the circuit and the shell 500V)
Withstand Voltage	AC 3700V/rms(between the circuit and the shell)
Electromagnetic Compatibility	IEC61326(EMC)
Safety Class	IEC61010-1 (CAT III 300V, CAT IV 150V, pollution degree 2); IEC61010-031; IEC61557-1 (earth resistance); IEC61557-5 (soil resistivity); JJG 366-2004 (earth resistance meter); JJG 1054-2009 (clamp-on earth resistance meter).

III. Range and Accuracy

1．Measurement Ranges, Accuracy, and Resolution

2．General Specifications

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