The IPC/JEDEC-9704A standard defines methods for measuring mechanical strain on PCBs during manufacturing to prevent solder joint and laminate failures. A compliant report requires using three-element rosettes, sampling at high frequencies, and plotting peak strain against strain rate against a calculated limit line. For more details, visit IPC-9704 Strain Gage Testing | PDF | Printed Circuit Board
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Strain measurements can vary significantly between identical processes due to operator technique, equipment variation, or environmental factors. Statistical approaches and appropriate sample sizes are recommended. ipc-9704 pdf
IPC‑9704 explicitly states that its limits are guidelines , not absolute thresholds. OEMs and component suppliers may specify tighter limits based on their own qualification data and field experience. OEMs and component suppliers may specify tighter limits
The goal is to prevent (cracks) that may not be visible during in-circuit testing but will cause field returns months later. control manufacturing yields
The IPC-9704 standard covers a comprehensive range of topics essential for effective strain gauge testing. Here are the main sections and their core contents:
For engineers and quality professionals seeking to eliminate hidden mechanical failures, control manufacturing yields, and satisfy customer requirements for documented strain data, an official copy of IPC‑9704A is not a luxury—it is a .