UZ004 Line Resistance Kit – Isolation Board & Resistor Load

UZ004 Line Resistance Kit – Isolation Board & Resistor Load for USB-A Port Testers

The UZ004 Line Resistance Kit is a precision electronic measurement accessory designed for USB-A port testers including models U3, L, PA2C, and the new A2Q. Whether you're a hobbyist, electronics technician, or lab professional, this kit provides everything you need for accurate 4-wire line resistance measurement and load testing in a compact, well-engineered package.

Key Features

• Wide Compatibility: Works with USB-A port testers including U3/L/PA2C and A2Q models. Includes a D+D- isolation board required for proper measurement operation.
• Simplified 4-Wire Resistance Measurement: The UZ004 unit enables precise line resistance readings using the 4-wire (Kelvin) method, minimizing lead resistance error.
• Dual 10W Resistors: Two high-power resistors handle real-world load simulation. Under 5V/1A conditions, each resistor reaches approximately 5W — note that the board will become very hot during use. Caution: avoid contact with the resistors during operation to prevent burns.
• High-Current Range Switch: Easily toggle between measurement ranges with the onboard switch. Range indicator LEDs provide at-a-glance status.
• 3 Input Ports: Supports three simultaneous input connections for flexible test setups.
• Parallel Port Expansion: Four USB-A ports on the board are wired in parallel and support external decoy connections. Note: avoid connecting too many USB-A ports in parallel, as this may result in insufficient current — USB-C is recommended where possible.
• Horizontal & Vertical Mounting Options: The expansion interface is available in both horizontal and vertical form factors to suit your bench layout or enclosure requirements.
• USB Expansion Board Design: Functions as a USB-A expansion board for multi-port testing scenarios.

Specifications

Package Contents

• Option A: 1× UZ004 + 1× Isolation Board + 1× Resistor Load
• Option B: 1× Resistor Load – Horizontal
• Option C: 1× Resistor Load – Vertical

Important Notes

• D+D- isolation board usage is mandatory when performing measurements with this device.
• Colors shown in product images may vary slightly depending on monitor brightness and display settings.
• Please allow ±2 cm manual measurement deviation.
• The board gets very hot during operation — keep away from flammable materials and avoid skin contact with resistors while in use.

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Frequently Asked Questions

Q: What testers is the UZ004 Line Resistance Kit compatible with?

A: The UZ004 Line Resistance Kit is designed for use with USB-A port testers, specifically models U3, L, PA2C, and the newer A2Q series. It includes a D+D- isolation board that is required for accurate measurement operation with these devices.

Q: What is included in each package option of the UZ004 kit?

A: There are three package options: Option A includes the UZ004 unit, one isolation board, and one resistor load. Option B includes a single resistor load in horizontal orientation. Option C includes a single resistor load in vertical orientation — ideal for different bench or enclosure configurations.

Q: Is it safe to touch the resistors while the UZ004 kit is in use?

A: No — the resistors reach significant temperatures during operation (up to 5W per resistor under 5V/1A conditions). Avoid direct contact with the resistors while the device is powered to prevent burns. Ensure adequate ventilation around the board during use.

Q: Can I use multiple USB-A ports in parallel with the UZ004 expansion board?

A: While the four USB-A ports on the board are wired in parallel, connecting too many simultaneously may result in insufficient current delivery. For best performance, limit parallel USB-A connections and prioritize USB-C ports where available.