BANNOCKBURN, IL – IPC has released revision A to IPC-9850, Surface Mount Placement Characterization, reportedly making it simpler to quantify the performance of placement equipment.

“This standard lets you look at totally different types of machines and get a better comparison for how they will each work in your environment,” said Michael Cieslinski, senior engineer with Panasonic Factory Solutions Co. of America, and chair of the subcommittee that updated IPC-9850.

The revised standard updates the method for calculating measurement uncertainty. Individual factors included in the expanded measurement uncertainty metric are gage repeatability and reproducibility (GR&R) variance, nonlinearity, resolution, hysteresis and artifact uncertainty. Calculating the EMU is considered a more stringent test of measurement capability, since it adds many additional factors not calculated in the original IPC-9850 GR&R and accuracy report, while keeping the same passing process to tolerance ratio of less than 25%.

The comparison shows how machine speeds change as accuracy requirements rise. Evaluations are performed by placing five different types of test components in various quantities on test boards.

IPC-9850A allows a truer comparison of different pick-and-place equipment’s speed and capability, says Kris Roberson, IPC manager of assembly technology. IPC-9850A also complies with common methodologies for measurement system analysis and is compatible with the approach used by ASQ and other groups.

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