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| FORCE SENSITIVE QUARTZ CRYSTAL EPKV-10M APPLICATIONS The force sensitive quartz crystal EPKV-10M is intended for operation in a structure of precision electronic balances. It converts face shear strain into a frequency variation. Using this crystal, it is possible to design balances for weighing with a split-hair accuracy of weights by a mass from several milligrams up to hundreds of kilograms. FEATURES - High resolution and accuracy - Long term quartz crystal stability - Wide temperature range (-40...+80 C) - Low power consumption Suitable for precision weighting equipment Cost effective OPERATING CONDITIONS / ELECTRICAL CHARACTERISTICS PARAMETERS SPECIFICATIONS AND REMARKS Electrical characteristics UNITS kHz k mW Hz/gm C C kHz kg ppm ppm pF mm Frequency range (fundamental mode), fO Resonance Resistance typ./max., Rr Drive Level max., DL 9960...10100 30; 50 / 50 1.0 Operating conditions Force sensitivity Operating temperature, TOPR (typ./max) Storage temperature, TSTR Maximum frequency deviation Maximum stress-strain load Frequency Tolerance, f/fO Aging first year/next years max. Static Capacitance typ., CO Capacitance ratio r Size 3.5 0.3 -40...+80 / -60...+100 +5...+40 9.8 0.85 5... 20 50 5 / 25 9.1...8.1 200 4 x 10 x 0.17 One side with one electrode of the force sensitive quartz crystal EPKV-10M is glued by epoxy adhesive on a cleaned and skim surface, thus the central part of the crystal should be free (see figure). After curing of the glue, the two wires are soldered to the contacts of the crystal, if required. If the crystal is in a free condition, its force sensitivity characteristic is practically linear. If the crystal is mounted, a nonlinearity of the force sensitivity characteristic occurs, which must be determined individually. EXTERNAL DIMENSIONS UNITS: millimeters 4 1 2 0.17 1 - surface, on which the force sensitive quartz crystal is mounted 2 - force sensitive quartz crystal EPKV-10M. 3 - undercut. 4 - contact leads. 11 6 3 4 min 0.02 GmbH & Co. KG Wasemweg 5 D-74821 Mosbach Germany page 1(1) www.AXTAL.com fon: +49 (6261) 939834 fax +49 (6261) 939836 E-mail: info@axtal.com |
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