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Fil-Tech, Inc.
Technical Bulletin No.
A Comparison of Fil-Tech and Inficon
Silver 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 QI8009
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Inficon 008-009
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Sensor material
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Single crystal alpha quartz
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Same
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Angle of cut 1
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35 degrees 15’ (AT)
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Same
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Contour
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3 diopter Plano-Convex
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Same
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Surface roughness
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10 micron
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Same
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Diameter
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0.550” (13.97 mm)
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Same
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Electrode
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Silver/Chromium
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Same
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Electrical Characteristics 2
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Fil-Tech QI8009
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Inficon 008-009
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Resonant frequency (MHz)
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5.975-5.993
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5.975-5.995
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Resistance at resonance
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<15 Ohms
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10-20 Ohms
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Contact resistance
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<20 Ohms
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10-30 Ohms
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Notes:
1. 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.
2. 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. Fax 617-742-0686
COPYRIGHT @FIL-TECH INC. 1998
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