What is the MT-4105, and what is it primarily used to measure?

The MT-4105 is an earth resistance tester that supports two-pole and three-pole earth resistance measurements and can also measure earth voltage. It is suitable for commissioning and periodic inspection of building, power-distribution, lightning-protection, and equipment-protective earthing systems.

What is the difference between the two-pole and three-pole methods on the MT-4105?

The three-pole method uses auxiliary earth stakes to establish current and potential circuits and is generally more suitable for formal earth resistance testing. The two-pole method uses an existing low-resistance reference earth and is quicker, but the result includes the effect of the reference path. Select the method according to site conditions and applicable requirements.

Can the MT-4105 be used to inspect lightning-protection earthing?

It can be used to check resistance and earth voltage for lightning-protection, power-distribution, and equipment-protective earthing systems. Compliance must be determined according to local regulations, design requirements, and the system's purpose; one universal resistance value cannot be applied to every site.

What should I do if the MT-4105 indicates interference voltage?

AC noise or leakage current in the earth circuit can affect the reading. First confirm that the site is safe, inspect the test-lead routing and nearby energized equipment, and pause the test to eliminate interference if necessary. Do not ignore the warning and force a reading.

How should the auxiliary earth stakes be positioned for a three-pole test?

Position the current stake, potential stake, and earth electrode under test at the appropriate distances specified in the manual and keep them as close to a straight line as possible. Good soil contact is also required. Insufficient spacing, buried metal piping, or excessively dry soil can cause measurement errors.

What are the maximum, minimum, average, and 100-record functions on the MT-4105 used for?

The statistical functions help show variation at the same test point, while the 100 non-volatile records can store results from multiple locations. Also record the location, weather, soil condition, and date so that later trend comparisons are meaningful.

When is the relative-value function on the MT-4105 useful?

The relative-value function can subtract the effect of test leads or a reference value, making it easier to compare locations or consecutive test points. Establish the reference with the correct connections and a stable reading; otherwise, the same error will affect all subsequent differences.

What safety precautions should be taken before using the MT-4105 for earth testing?

Confirm that the test area has no hazardous earth potential, thunderstorms, or exposed live conductors, and use approved test leads and personal protective equipment. Do not test a lightning-protection earth system during a thunderstorm, and prevent people from tripping over the test stakes and leads.

What can cause MT-4105 readings to fluctuate significantly?

Common causes include poor contact at the auxiliary stakes, loose test leads, dry soil, electrical interference, or inadequate test spacing. Re-route the leads, improve the stake contact, and repeat the measurements in different directions to confirm consistency.

How can I confirm whether I have the MT-4105 or MT-4105-C version?

Both are earth resistance testers in the same series. The full model number may distinguish sales region, packaging, or accessories. When purchasing, check the official accessory list and confirm that the auxiliary earth stakes, test leads, and carrying accessories are included.

MT-4105

Global
Taiwan

Earth Resistance Tester

Name: Earth Resistance Tester
Brand: Pro'sKit
SKU: MT-4105

• Two-pole/three-pole ground resistance measurement
• Voltage measurement to ground
• Maximum/minimum/average value measurement
• 100 sets of data storage, no loss in case of power failure
• Measurement of interference voltages
• Measurement of the earth resistance of different equipment (e.g. high-voltage towers, buildings, electrical engineering grounding systems, mobile communication base stations, high-frequency transmitters, etc.)
• Monitoring and planning of lightning protection systems
• Resistance measurement with auxiliary earth electrodes

The instrument is controlled by an intelligent microcontroller chip, with high reliability and high accuracy. It can be used to test the earth resistance of various power distribution lines, indoor wiring, electrical equipment, lightning protection equipment, etc. There are two measurement modes: two-pole method and three-pole method. It can also measure the earth voltage.
The instrument uses a large liquid crystal digital display with a backlight, which is easy for the user to read. It has data storage function, which can store 100 sets of measurement data, and the data will not be lost when power is lost, which can be convenient for users to make historical data inquiry. It can measure the maximum value, minimum value and average value, and has relative measurement function and automatic shutdown function.

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What is the MT-4105, and what is it primarily used to measure?

The MT-4105 is an earth resistance tester that supports two-pole and three-pole earth resistance measurements and can also measure earth voltage. It is suitable for commissioning and periodic inspection of building, power-distribution, lightning-protection, and equipment-protective earthing systems.
What is the difference between the two-pole and three-pole methods on the MT-4105?

The three-pole method uses auxiliary earth stakes to establish current and potential circuits and is generally more suitable for formal earth resistance testing. The two-pole method uses an existing low-resistance reference earth and is quicker, but the result includes the effect of the reference path. Select the method according to site conditions and applicable requirements.
Can the MT-4105 be used to inspect lightning-protection earthing?

It can be used to check resistance and earth voltage for lightning-protection, power-distribution, and equipment-protective earthing systems. Compliance must be determined according to local regulations, design requirements, and the system's purpose; one universal resistance value cannot be applied to every site.
What should I do if the MT-4105 indicates interference voltage?

AC noise or leakage current in the earth circuit can affect the reading. First confirm that the site is safe, inspect the test-lead routing and nearby energized equipment, and pause the test to eliminate interference if necessary. Do not ignore the warning and force a reading.
How should the auxiliary earth stakes be positioned for a three-pole test?

Position the current stake, potential stake, and earth electrode under test at the appropriate distances specified in the manual and keep them as close to a straight line as possible. Good soil contact is also required. Insufficient spacing, buried metal piping, or excessively dry soil can cause measurement errors.
What are the maximum, minimum, average, and 100-record functions on the MT-4105 used for?

The statistical functions help show variation at the same test point, while the 100 non-volatile records can store results from multiple locations. Also record the location, weather, soil condition, and date so that later trend comparisons are meaningful.
When is the relative-value function on the MT-4105 useful?

The relative-value function can subtract the effect of test leads or a reference value, making it easier to compare locations or consecutive test points. Establish the reference with the correct connections and a stable reading; otherwise, the same error will affect all subsequent differences.
What safety precautions should be taken before using the MT-4105 for earth testing?

Confirm that the test area has no hazardous earth potential, thunderstorms, or exposed live conductors, and use approved test leads and personal protective equipment. Do not test a lightning-protection earth system during a thunderstorm, and prevent people from tripping over the test stakes and leads.
What can cause MT-4105 readings to fluctuate significantly?

Common causes include poor contact at the auxiliary stakes, loose test leads, dry soil, electrical interference, or inadequate test spacing. Re-route the leads, improve the stake contact, and repeat the measurements in different directions to confirm consistency.
How can I confirm whether I have the MT-4105 or MT-4105-C version?

Both are earth resistance testers in the same series. The full model number may distinguish sales region, packaging, or accessories. When purchasing, check the official accessory list and confirm that the auxiliary earth stakes, test leads, and carrying accessories are included.

MT_4105.pdf (Multi Language)	Manual	Download

Shipping Instructions

Ship From	SH
Packing	Industrial Box
CTN	8
N.W.	17.35 Kg
G.W.	18.35 Kg
CUFT	2.7
M³	0.08
MOQ	8