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A Kelvin test socket is a type of socket that uses Kelvin (or four-wire) measurement to test the resistance of semiconductor devices with high accuracy and low contact resistance. It uses dual independent spring probes for each device pad, one for current injection and one for voltage measurement. Kelvin test sockets are suitable for testing CSP, µBGA, Bump-Array, QFN, QFP, MLF, DFN, SSOP, TSSOP, TSOP, SOP, SOIC, LGA, LCC, PLCC, TO and any SMT package style. They are also compatible with PGA packaged devices.  One of the manufacturers of Kelvin test sockets is JYPROBE, which offers a range of standard and customized solutions based on spring loaded probe technology. Their Kelvin spring probes can be used for low pitch applications down to 0.35 mm.

KELVIN TEST SOCKET 
KELVIN- test-socket

KELVIN Test Sockets

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◇ CONTACT GRID PITCH FOR DUT: 0.35MM/0.40MM/0.5MM
◇ OPERATING TEMPERATURE:-55-150°C
◇ DUT PACKAGES: MATRIX PACKAGE BGA, WLCSP,
                                 SURROUNDING PACKAGE QFN,
◇ LIFESPAN: OVER 500,000 CYCLES
◇ RESISTANCE: <50~100MOHMS
◇ PLUNGER TIPS: SHARP OR CROWN HEADS


◇ SUITABLE FOR THE VERY FINE PITCH IN-CIRCUITS
◇ FOUR-CONTACTS MEASUREMENT TO A STABLE AND LOW RESISTANCE TEST
◇ SELF-CLEANING TOP PLUNGER TIP DESIGN
◇ MORE ACCURACY OF DUT CONTACT
◇ DURABLE SPRING CONTACTS LIFESPAN



kelvin-test-socket-sketch


◇ CHOOSE THE APPROPRIATE SIZE, TYPE AND COLOR OF THE TEST SOCKET FOR YOUR APPLICATION.

◇  STRIP THE INSULATION FROM THE END OF THE WIRE OR LEAD THAT YOU WANT TO CONNECT TO THE TEST SOCKET.

◇ ATTACH THE WIRE OR LEAD TO THE TEST SOCKET USING THE APPROPRIATE TERMINATION METHOD. FOR EXAMPLE, IF YOU HAVE A SOLDER-TYPE TEST SOCKET, YOU WILL NEED TO HEAT UP THE SOLDERING IRON AND APPLY SOME SOLDER TO THE WIRE AND THE SOCKET TERMINAL.

◇  MOUNT THE TEST SOCKET ON A PANEL, BOARD OR DEVICE USING SCREWS, NUTS, WASHERS OR CLIPS. MAKE SURE THE TEST SOCKET IS SECURELY FASTENED AND ALIGNED WITH THE CORRESPONDING TEST PLUG.

◇  TEST THE CONNECTION BY INSERTING A TEST PLUG INTO THE TEST SOCKET AND MEASURING THE VOLTAGE, CURRENT OR RESISTANCE USING A MULTIMETER OR OTHER INSTRUMENT.

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