Meaning
A non-ideal electrical response occurs in spring-loaded contact probes due to variable internal contact resistance between sliding internal components. The phenomenon defined as pogo pin non-linearity causes electrical resistance variations and signal distortion as current passes through internal plunger, barrel, and spring interfaces. The effect diminishes when high spring force and internal ball-bias mechanisms maintain continuous metal-to-metal contact during signal transmission.
Internal Contact Dynamics
Current passing through a spring-loaded probe divides between the helical spring and direct sliding contacts between plunger and barrel walls. Occurrence of pogo pin non-linearity stems from microscopic oxide films and intermittent contact points along these sliding internal surfaces.
Harmonic Distortion
Variable internal contact resistance modulates RF signals passing through spring probes, generating unwanted harmonic frequencies and intermodulation products. When pogo pin non-linearity affects high-frequency automated test equipment, false measurement failures occur during product testing. High RF power levels aggravate non-linear junction effects, increasing intermodulation distortion power across test interfaces.
Spectrum analyzers measure spurious product generation to isolate defective spring pins within test sockets.
Interconnect Qualification
Automated test procedures evaluate probe resistance stability under continuous RF power and mechanical actuation cycling. Screening for pogo pin non-linearity requires measuring two-tone passive intermodulation across the full operating compression range of the probe. Quality records document probe longevity and intermodulation performance before fixture release to manufacturing lines.
