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Reflow Soldering
Soldering technique involving the application of solder prior to the actual joining. To solder, the parts are joined and heated, causing the solder to re-melt, or re-flow.

Registration
The alignment of a circuit pattern on a substrate.

Registration Marks
The marks used for aligning successive processing masks.

Resistor Drift
The change in resistance of a resistor through aging and usually rated as percent change per 1000 hr.

Resistor Geometry
The film resistor outline. (see Aspect Ratio)

Resistor Overlap
The contact area between a film resistor and a film conductor

Resistor Paste Calibration
The characterization of a resistor paste for resistivity, TCR and other parameters by screening and firing a test pattern using the paste and recording the results.