Clamp Earth Resistance Tester

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Clamp Earth Resistance Tester

HM2571B high-end multi-functional clamp earth resistance meter is with USB communication interface, storage data can be uploaded to the computer, through software analysis, report, printing and so on. At the same time, it could test 40A leakage current, increases real-time clock function to display present time, supports multi-parameter on-screen display function, can display grounding resistance and ground leakage current at the same time, which is more practical, convenient and efficient.

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Description

Technical Parameters

Product Overview & Application Scenarios

HM2571B high-end multi-functional clamp earth resistance meter is with USB communication interface, storage data can be uploaded to the computer, through software analysis, report, printing and so on. At the same time, it could test 40A leakage current, increases real-time clock function to display present time, supports multi-parameter on-screen display function, can display grounding resistance and ground leakage current at the same time, which is more practical, convenient and efficient.

Features & Advantages

Breakthrough in self-test the boot a long time to wait, start immediately into the test.
Breakthrough relay self-test mode, using the most advanced processing algorithms and digital integration technology.
Add real-time clock function to display real-time time of present test.
New design, panel operation with 6 buttons, better performance.
An increase of sound and light alarm, "beep-beep--beep --" alarm sound.
Increase the interference signal recognition indicator.
Add a variety of combination display mode, can choose resistance + current, resistance + time, current + time to display on screen.
Measure range more large: 0.01Ω-1500Ω,0.001mA-40.0A.
Stored data: 999 Units. Lower power consumption: Maximum operating current not exceeding 50mA.
Rechargeable battery makes it more convenient to use.

Application Conditions

1. Environmental Conditions
Operating Temperature: -10°C to +55°C
Relative Humidity: ≤ 80% RH (non-condensing)
Altitude: ≤ 2000 meters
Pollution Degree: 2 (for normal indoor environments)

2. Electrical Conditions of the Grounded System:

System Requirement,Measurement Principle,It cannot measure an isolated, single ground rod.

3.Physical Conditions for Clamping:
Jaw Opening: Must be large enough to fit around the ground conductor or rod. Typical max jaw size is around 32mm.
Conductor Position: The conductor must be centered within the clamp jaws for accurate measurement.
Jaw Cleanliness: The jaw surfaces must be clean and closed completely to ensure a good magnetic circuit.

4.Electromagnetic Environment
Stray Currents: The instrument is designed to filter out power frequency (50/60 Hz) interference. However, strong external magnetic fields from nearby high-current cables can affect accuracy.
Safe Distance: Keep the meter away from live busbars or conductors not involved in the measurement

Maintenance & FAQs

Q: What is the biggest advantage of using a clamp-on meter like the HM2571B?

A: The primary advantage is speed and safety. You can measure earth resistance withoutdisconnecting the ground rod and without using auxiliary spikes. You simply clamp the meter around the ground conductor and get a reading in seconds, which is ideal for quick, periodic inspections.

Q: Why does the meter show "OL" or an unstable/unrealistically high reading?

A: This is the most common issue. It almost always means the measurement conditions are not met. The ground rod you are testing must be part of a multi-grounded system (i.e., there are other parallel grounding paths). The meter cannot work on a single, isolated ground rod because it needs a complete electrical loop to function.

Q: Can I use the HM2571B to measure any ground rod?

A: No. This is the most critical limitation. It can only measure ground rods that are connected in parallel with other ground rods or a system ground (like the utility neutral). It is perfect for testing ground rods at telephone poles, cellular towers, or building service entrances where multiple paths exist. It will not work on a standalone ground rod for a small shed or an isolated piece of equipment.

Q:What is a "good" reading for earth resistance with this meter?

A: A good reading is typically below 1 Ohm for critical infrastructure like substations or telecom sites. For general building services, readings below 5-10 Ohms are often acceptable. However, you must always refer to the specific requirements of the system you are testing, as codes and standards vary.

Q: Can I also measure ground (leakage) current with this meter?

A: Yes, this is a key feature. The HM2571B can also function as a leakage current clamp meter. Simply select the current measurement function (A) and clamp it around all conductors (phase and neutral) of a circuit. Any imbalance is the leakage current flowing to ground. Clamping around only the ground conductor will show the actual leakage current on that conductor.

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Technical Specifications

Mode	Range	Resolution	Accuracy
Resistance	0.010Ω-0.099Ω	0.001Ω	±(1%+0.01Ω)
	0.10Ω-0.99Ω	0.01Ω	±(1%+0.01Ω)
	1.0Ω-49.9Ω	0.1Ω	±(1%+0.1Ω)
	50.0Ω-99.5Ω	0.5Ω	±(1.5%+0.5Ω)
	100Ω-199Ω	1Ω	±(2%+1Ω)
	200Ω-395Ω	5Ω	±(5%+5Ω)
	400-590Ω	10Ω	±(10%+10Ω)
	600Ω-880Ω	20Ω	±(20%+20Ω)
	900Ω-1500Ω	30Ω	±(25%+30Ω)
Current	0.00mA -9.95mA	0.05mA	±(2.5%+2mA)
	10.0mA -99.0mA	0.1mA	±(2.5%+5mA)
	100mA -300mA	1mA	±(2.5%+20mA)
	0.30A-2.99A	0.01A	±(2.5%+0.1A)
	3.0A-9.9A	0.1A	±(2.5%+0.3A)
	10.0A-19.9A	0.1 A	±(2.5%+0.5A)
	20.0A-40.0A	0.1 A	±(3%+1A)

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