Abstract: A charge pump (10) having a current source (12) and a current sink (14) is provided. Current source (12) generates one of two output currents using current mirror (16) and switch (18). Switch (18) selects between the two outputs based on a signal from source control (20). Current sink (14) generates one of two currents using current mirrors (44) and (46), and switch (48). Switch (48) selects from two currents generated by current mirrors (44) and (46).

Abstract: A reference standard and a method for manufacturing a reference standard for use in calibrating an eddy current probe is disclosed. The reference standard is produced from a block of metal that is deformed by an indentation tool to provide a notch of prescribed dimensions. The reference standard is compressed along an axis substantially transverse to the longitudinal axis of the notch to substantially close the notch. A family of reference standards formed in this manner can be produced to calibrate an eddy current probe prior to use of the probe in evaluating metal components such as aircraft framework for the presence of fatigue cracks and the like.

Abstract: The subject invention provides a method of making a pocket folder having a plurality of page inserts from a pre-printed web. A first fold line is provided along a first transverse line which divides the web into integral folder and insert sections. A second fold line is provided along a second transverse line adjacent an end of the folder section opposite the insert section, thereby forming a folder pocket member. A third fold line formed along the longitudinal midline of the folder portion divides the folder portion into first and second cover sheets. The insert section is cut inside of and parallel to opposite longitudinal edges of the web to form lateral marginal portions. The insert portion is also cut adjacent to and parallel with the longitudinal center line to form a pair of insert pages separated by a medial marginal portion. The lateral and medial portions are removed and the insert pages are folded along the first transverse fold line to superpose the folder cover sheets.