Etch compensation modifies manufacturing imagery to help produce the intended finished conductor geometry. It should remain distinguishable from an electrical design change. Preserve the original customer data and the manufacturing transformation so a later dimensional question can be traced to the correct stage.
Identify the compensation operation
Ucamco’s Secure Etch Compensation description discusses shape-dependent adjustments, clearance controls and retention of original data. Those functions illustrate why compensation is more specific than enlarging every copper feature by one unspecified amount.
Record the CAM job revision, applicable layer and parameter-set reference. Identify any feature classes treated differently, particularly where dimensions are tied to electrical or assembly requirements.
Preserve three distinct representations
| Representation | Purpose |
|---|---|
| Released design | Defines the customer’s intended geometry |
| Manufacturing image | Contains the approved process transformation |
| Measured board | Provides evidence of the achieved result |
Do not compare the compensated image directly with a finished-width requirement without acknowledging its purpose. Likewise, do not use a modified CAM file as the new design master simply because it produced an acceptable lot.
Review exceptions before processing
Ask how critical features, small gaps, pads and specified conductor shapes are handled. If an adjustment cannot maintain the required finished relationship, resolve that issue with the design owner instead of silently converting it into a design relaxation.
Keep the measurement definition explicit. Width measured at different positions through an etched conductor section may not answer the same question; agree what the drawing requires and how it will be evaluated.
Close the loop with product evidence
- Select representative features before the first build.
- Retain their design and CAM references.
- Measure using the agreed definition.
- Compare results with the intended geometry.
- Adjust the process through controlled revisions where needed.
A change in copper construction or etching route can justify rechecking a previously successful compensation set. Reusing its name does not prove that the underlying production conditions are still equivalent.
When an investigation finds a mismatch, determine whether it originated in the released geometry, transformation or physical process. Correcting the wrong stage can make the next lot worse while obscuring the original cause.
Archive the successful configuration with its measured evidence and scope. The aim is a repeatable path from design intent to finished feature, with enough information to explain the result when either design or process changes.
For a repeat order, verify that the original source package is paired with the intended CAM revision. Applying a compensation transformation twice can be avoided by making the input state explicit instead of identifying files only by a similar customer job name.
See etched-width measurement definitions and finished-copper requirements for the acceptance details that must remain consistent with the compensation review.
Move from reading to a build-ready project
Use the fabrication and assembly checklists to prepare drawings, production files and test requirements.
Open the DFM checklist