{"product_id":"uz004-line-resistance-kit-isolation-board-resistor-load-usb-tester-1","title":"UZ004 Line Resistance Kit – Isolation Board \u0026 Resistor Load","description":"\u003ch2\u003eUZ004 Line Resistance Kit – Isolation Board \u0026amp; Resistor Load for USB-A Port Testers\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eUZ004 Line Resistance Kit\u003c\/strong\u003e 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.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide Compatibility:\u003c\/strong\u003e Works with USB-A port testers including U3\/L\/PA2C and A2Q models. Includes a D+D- isolation board required for proper measurement operation.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSimplified 4-Wire Resistance Measurement:\u003c\/strong\u003e The UZ004 unit enables precise line resistance readings using the 4-wire (Kelvin) method, minimizing lead resistance error.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDual 10W Resistors:\u003c\/strong\u003e 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. \u003cstrong\u003eCaution: avoid contact with the resistors during operation to prevent burns.\u003c\/strong\u003e\n\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHigh-Current Range Switch:\u003c\/strong\u003e Easily toggle between measurement ranges with the onboard switch. Range indicator LEDs provide at-a-glance status.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e3 Input Ports:\u003c\/strong\u003e Supports three simultaneous input connections for flexible test setups.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eParallel Port Expansion:\u003c\/strong\u003e 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.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHorizontal \u0026amp; Vertical Mounting Options:\u003c\/strong\u003e The expansion interface is available in both horizontal and vertical form factors to suit your bench layout or enclosure requirements.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUSB Expansion Board Design:\u003c\/strong\u003e Functions as a USB-A expansion board for multi-port testing scenarios.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUZ004 Line Resistor Kit\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eABS\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eResistor Power Rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e10W per resistor\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInput Ports\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCompatible Testers\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eU3 \/ L \/ PA2C \/ A2Q (USB-A port testers)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMounting Options\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eHorizontal \/ Vertical\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCountry of Origin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMade in Mainland China\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003ePackage Contents\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOption A:\u003c\/strong\u003e 1× UZ004 + 1× Isolation Board + 1× Resistor Load\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOption B:\u003c\/strong\u003e 1× Resistor Load – Horizontal\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOption C:\u003c\/strong\u003e 1× Resistor Load – Vertical\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eImportant Notes\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eD+D- isolation board usage is mandatory when performing measurements with this device.\u003c\/li\u003e\n  \u003cli\u003eColors shown in product images may vary slightly depending on monitor brightness and display settings.\u003c\/li\u003e\n  \u003cli\u003ePlease allow ±2 cm manual measurement deviation.\u003c\/li\u003e\n  \u003cli\u003eThe board gets very hot during operation — keep away from flammable materials and avoid skin contact with resistors while in use.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eRelated Products You May Like\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/electromagnetic-induction-tester-coil-motherboard-fault-detector\"\u003eElectromagnetic Induction Tester – Coil \u0026amp; Circuit Fault Detector\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/air-compressor-pressure-gauge-0-10-0-12-0-25-bar-hydraulic-diy\"\u003eAir Compressor Pressure Gauge 0-10\/0-12\/0-25 Bar | DIY Tool\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/www.osha.gov\/eye-face-protection\" target=\"_blank\" rel=\"noopener\"\u003eOSHA on eye and face protection\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What testers is the UZ004 Line Resistance Kit compatible with?\u003c\/h4\u003e\n\u003cp\u003eA: 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.\u003c\/p\u003e\n\u003ch4\u003eQ: What is included in each package option of the UZ004 kit?\u003c\/h4\u003e\n\u003cp\u003eA: 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.\u003c\/p\u003e\n\u003ch4\u003eQ: Is it safe to touch the resistors while the UZ004 kit is in use?\u003c\/h4\u003e\n\u003cp\u003eA: 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.\u003c\/p\u003e\n\u003ch4\u003eQ: Can I use multiple USB-A ports in parallel with the UZ004 expansion board?\u003c\/h4\u003e\n\u003cp\u003eA: 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.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What testers is the UZ004 Line Resistance Kit compatible with?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The UZ004 Line Resistance Kit is designed for use with USB-A port testers, specifically models U3, L, PA2C, and the newer A2Q series. 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