The EPP-Series gauge-block calibration system for calibrating parallel-sided gauge blocks employs an LM 20 laser-interferometric gauging probe as its upper gauging probe. It has a measuring range of 20 mm and a length resolution of 1 nm. Investigations conducted by the German national bureau of standards (PTB) yielded metric errors of less than 10 nm for this gauging probe when used for calibrating gauge blocks. According to a PTB-recommendation, the total number of reference-standard gauge blocks required for calibrating a 122-piece set of gauge blocks may thus be reduced to fifteen. A calibration procedure allows determining system linearity errors (errors due to misalignments, angular misalignments of its gauging probe, and thermal effects) and correcting for them.The system is easy to operate from a PC running "Parallel Gauge Block Calibration" (PEKAL) signal-processing and control software, which also corrects, processes, and out-puts metrological data.
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