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Fil-Tech, Inc.
Technical Bulletin No. 8
Stress Relieving, Longer Life, Alloy
Quartz Crystals
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Fil-Tech’s quartz crystals are designed
to exactly replace original equipment
manufacturers’ crystals to insure trouble-free operation. In spite of this, Fil-Tech will often
tighten the OEM’s specification to enhance crystal performance. The following specifications
are used in evaluating a crystal:
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Physical Characteristics
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Fil-Tech QI8008
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Sensor material
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Single crystal alpha quartz
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Angle of cut 1
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35 degrees 15’ (AT)
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Contour
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3 diopter Plano-Convex
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Surface Roughness
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10 micron
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Diameter
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0.1550” (13.97 mm)
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Electrode
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Silver aluminum alloy/chromium
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Electrical Characteristics 2
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Fil-Tech QI8008
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Resonant frequency (MHz)
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5.975-5.993
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Resistance at Resonance
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<15 Ohms
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Contact Resistance
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<15 Ohms
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Notes:
- The true angle of cut varies as a function
of the contour. The true angle for this
configuration crystal is actually 35 degrees 16 minutes.
- The electrical characteristics for Inficon
crystals were taken from a 100-piece sample
size and may vary in larger lot sizes. Fil-Tech values are actual quality assurance
specifications. A detailed histogram of Fil-Tech lot measurements is available on request.
Note:
Fil-Tech believes that high-level inspections are required to maintain the high quality
crystal production demanded by our end users. In addition to the electrical and physical
parameters listed above Fil-Tech measures motional capacitance and inductance, spurious
resonance separation, and static capacitance to help track subtle changes in incoming quartz
quality and in the production process.
Tel 800-743-1743 FIL-TECH INC. 617-742-0686 Fax
COPYRIGHT FIL-TECH INC. 1998
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