Gossen Lunasix 3 Calibration Guide
by GOSSENComprehensive technical guide for calibrating and restoring the Gossen Lunasix 3 portable light meter, a precision measuring instrument from the early 1970s. This manual addresses the critical issue of obsolete mercury battery replacement, providing detailed instructions for adapting this classic equipment to modern silver oxide cells. The guide covers essential topics: substituting mercury batteries with 1.55V silver oxide cells, installing a diode to optimize voltage delivery and protect the meter's passive circuit. Practical sections include safe disassembly procedures with required tools, battery compartment access, and handling of sensitive internal components. Two calibration approaches are thoroughly explained: the direct method using an adjustable light box, and the indirect method based on LDR (light-dependent resistor) sensor characteristics. The document details the meter's output ranges, EV value correspondences between low and high brightness scales, and the iterative adjustment process for compensation potentiometers. Additional content covers the 6-stop neutral density filter mechanism and practical workarounds for achieving accurate calibration across the full dynamic range without specialized equipment.
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Document Details
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- Photography