HANDLING PRECAUTIONS
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Crystal unit
/ Resonator |
| 1. |
Drive level |
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Applying excessive drive level to the crystal units may cause deterioration of characteristics or damage. Circuit design must be such as to maintain a proper drive level.
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| 2. |
Negative resistance |
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Unless adequate negative resistance is allocated in
the oscillation circuit, oscillation or oscillation start up time
may increase.
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| 3. |
Load capacitance |
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Differences in the load capacitance in the
oscillation circuit may result in deviations in the oscillation
frequency from the desired frequency. Attempting to tune by force
may merely cause abnormal oscillation. Before use, please specify
the load capacitance of the oscillation circuit.
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Crystal Oscillator and real time clock module |
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All crystal oscillators and real time clock modules are provided with an IC. |
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Applying excessive level of extraneous noise to power source or input terminal may cause latch up or spurious phenomenon,which results in malfunction and breakdown. |
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Line impedance of a power supply should be as low as possible. |
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It is recommended that output load is installed
as close as possible to an oscillator (within 20 mm). |
| 4. |
Treatment of unused input terminals |
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Unused pins that are left open may collect noise, thereby resulting in malfunction. Also, power consumption may increase when both P-channel and N-channel are turned on, therefore connect unused input terminals to VCC or GND. |
| 5. |
Heat impact |
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Repeated large changes in temperature may degrade the characteristics of a deteriorated crystal unit and cause breakage of wires inside the plastic mold. This must be avoided. |
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Incorrect mounting of the oscillator may cause malfunction and breakdown, so please check the mounting direction when Installing. |
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It is not recommend to power on from intermediate electric
potential and / or extreme fast power on. Powering on under such
conditions may cause no oscillation and / or malfunction. |
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Sensing device |
| 1. |
Interference between the sensors |
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The crystal sensor may catch the interference by board vibration and power supply common impedance. |
| 2. |
Protection against vibration |
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Please consider about protection against vibration when the crystal sensor is operated in vibration condition. |
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Optical device |
| 1. |
Chemicals |
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Do not use chemicals that
may negatively affect the glass materials, vapor deposited materials, or
adhesives used in the product. |
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