100A Contact Resistance Tester

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100A Contact Resistance Tester

HM6090-100A Test procedures require conductive contact resistance testing of various switchgear and cable connectors, the test current shall not be less than 100A Contact resistance increases due to contact surface oxidation, poor contact fastening and other reasons. When the high current flows, the temperature of the contact point rises, which accelerates the oxidation of the contact surface and further increases the contact resistance will lead to serious accidents.Therefore, it is necessary to measure the contact resistance often or regularly.

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Description

Technical Parameters

Product Overview & Applications

Product Overview

HM6090-100A Test procedures require conductive contact resistance testing of various switchgear and cable connectors,
the test current shall not be less than 100A Contact resistance increases due to contact surface oxidation,
poor contact fastening and other reasons. When the high current flows, the temperature of the contact point rises,
which accelerates the oxidation of the contact surface and further increases the contact resistance will lead to serious accidents.Therefore, it is necessary to measure the contact resistance often or regularly.

Features & Advantages

1.Wide resistance measurement range and high resolution.

2.High precision switching power supply, automatically adjust.
3.With temperature compensation function, automatically convert to 20℃ resistance.
4.Easy operation with a 5.0" 65K color touch screen.
5.Built-in high-capacity non-volatile memory for 500 sets of data.
6.Built-in high-speed micro thermal printer for printing measurement data.
7.Data can be exported through a U disk.

Operating Condition

Category	Parameter	Typical Condition	Rationale & Implication
Environmental	Temperature	-10°C to +50°C	Ensures measurement accuracy and battery performance.
	Humidity	< 80% (Non-condensing)	Prevents moisture damage and internal short circuits.
	Altitude	< 2000 meters	Maintains safe air insulation between high-current terminals.
Electrical & Safety	Circuit Status	FULLY DE-ENERGIZED	Critical for operator and equipment safety.
	Grounding	MANDATORY	Protects the user from electric shock.
	Power Source	Internal Battery / Specified Charger	Prevents damage to the internal power circuitry.
Physical	Ingress Protection	IP20 (No water protection)	Must be used in a clean, dry environment.
	Handling	Avoid shock, vibration	Protects the sensitive internal electronics.

Maintenance FAQs

Q: What is the main purpose of the HM6090-100A?

A: It is designed to precisely measure the contact resistance of electrical connections in high-current equipment like circuit breakers, switches, and busbars. By injecting a high DC current (up to 100A), it identifies faulty, corroded, or loose contacts that can overheat and fail.

Q: What is the difference between the 100A and 200A models?

A: the primary difference is the maximum output current.

HM6090-100A (100A): Ideal for most medium-voltage applications (e.g., distribution breakers, MCCs, industrial switchgear). It is lighter and may have a longer battery life per charge.

HM6090-200A (200A): Used for high-voltage equipment (e.g., transmission-level breakers) where higher current is needed to overcome contact film resistance for the most accurate results. The 100A model is the workhorse for general maintenance, while the 200A model is for more critical, high-energy systems.

Q: What is the typical measurement range and accuracy?

A: Measurement Range: Typically 0.1 µΩ - 2 mΩ (or similar).

Accuracy: Typically around ±(0.5% of reading + 2 digits) at 100A.

Always verify the exact specifications on the product's calibration certificate.

Q: Why is grounding necessary?

A: Properly grounding the tester and the equipment is a critical safety step. It protects the operator from any accidental induced voltages or residual charge that may be present in the switchgear.

Q: What is the "Four-Wire (Kelvin) Method" and why is it used?

A: This is the technique used for high accuracy. It employs two separate pairs of leads:

Current Leads (C1, C2): Deliver the high test current (100A).

Potential Leads (P1, P2): Measure the tiny voltage drop directly across the contact.

This method eliminates the resistance of the test leads and clamps from the measurement, giving you the true resistance of the contact itself.

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Technical Specifications

Test current	Test range	Accuracy
100A	0~40mΩ	±(0.5%rdg+0.2μΩ)
50A	0~80mΩ	±(0.5%rdg+0.2μΩ)

Open-circuit voltage: DC10V

Resolution: 0.0001 μΩ, 5 significant digits

Host size: 360mm×235mm×270mm

Host weight: 8.5kg

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