. Electronic apparatus for biological research. Electronic apparatus and appliances; Biology -- Research. VISUAL INDICATORS Electrical protection of moving-coil movements Meters may be protected from overload by the connection in series of Wollaston wire fuses, and the construction of these has been described by Strafford^. Alternatively, use may be made of the non-linear resistance properties of semi-conductor diodes {Figure ). When a potential differ- ence across the movement is within the normal range, neither diode is switched completely to full-conduction, and the diode resistances ar
. Electronic apparatus for biological research. Electronic apparatus and appliances; Biology -- Research. VISUAL INDICATORS Electrical protection of moving-coil movements Meters may be protected from overload by the connection in series of Wollaston wire fuses, and the construction of these has been described by Strafford^. Alternatively, use may be made of the non-linear resistance properties of semi-conductor diodes {Figure ). When a potential differ- ence across the movement is within the normal range, neither diode is switched completely to full-conduction, and the diode resistances are therefore high; most of the current supplied passes through the meter. Under overload conditions, however, one or other of the diodes conducts strongly, the resistance is low and most of the applied current flows through that diode instead of through the meter. The scale is no longer linear, so in cases where both are applicable the choice between fuse protection ? o-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Donaldson, Peter Eden Kirwan. New York, Academic Press
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