萝莉影视

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    Electronic Components
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    3. Timing Devices (Crystal Unit / Ceramic Resonator)
    4. Crystal Units
    5. Basic Knowledge of Crystal Units
    6. Basic Knowledge of How to Measure the Drive Level
    Crystal Units

    Crystal UnitsBasic Knowledge of How to Measure the Drive Level

    Drive level

    Drive level indicates power consumption by crystal unit while oscillation circuit works.
    It is important for crystal to keep within drive level specification.Excessive drive level might cause unexpected change of frequency and equivalent series resistance.

    Measurement

    Calculation

    Drive level could be calculated as follows.

    Drive level = I² ?R1

    I
    Drive current [Effective value]
    R1
    Equivalent series resistance of crystal unit

    Drive current is a current through crystal unit while the oscillation circuit works. Drive current could be measured on actual oscillation circuit. R1 could be measured by network analyzer and so on.

    Measurement example

    1. Measurement equipment and device
      • PCB
      • Crystal unit (with equivalent circuit constants data)
      • Oscilloscope, Current probe
    2. Solder a lead wire to crystal and set a current probe as figure shown in below.
      3. Connecting current probe. Desolder one side of crystal pad and connect to PCB by lead wire through current probe.
    3. Supply power voltage to PCB and observe drive current waveform on oscilloscope.
    4. Caluculate effective value of drive current.
      If waveform is sine wave or similar, effective value is caluculated by Ip-p/2√2 With digital oscilloscope, effective value could be read by function of oscilloscope.
    5. Drive level is caluculated by above formula.
    Oscillation circuit: Normal condition. Measuring current only through crystal. So, current probe should be put at point A.

    Judgement

    Measured drive level should not exceed drive level specified in crystal specification.

    Basic Knowledge of Crystal Units

    Crystal Units: Basic Knowledge of Technical Terms

    We describe the technical terms frequently used with crystal units such as the resonance frequency, equivalent circuits, and pulling sensitivity.
    Basic Knowledge of How to Measure the Oscillation Margin

    Explains the oscillation margin and how to calculate (determine) it, as well as how to measure or make a quick check of the negative resistance, etc.
    Basic Knowledge of How to Measure the Oscillation Frequency

    Describes what an oscillation frequency is, shows how to calculate and measure the oscillating frequency (frequency counter, non-contact and spectrum analyzer, non-contact), etc.
    Basic Knowledge of How to Measure the Oscillation Amplitude

    Describes the oscillation amplitude, shows what is required to measure it, and presents notes on things to consider, etc.
    The Advantages of 萝莉影视's Crystal Units

    We describe the strengths of 萝莉影视's crystal units, which use our world-first unique packaging technology.
    Selection Guide

    We describe selected products most suitable for your application among ceramic resonators (CERALOCK) and crystal units.
    Support information by applications

    We provide support information by application for ceramic resonators (CERALOCK) and crystal units.

    Inquiries

    Avoiding Counterfeit Products

    1. Electronic Components
    2. Timing Devices (Crystal Unit / Ceramic Resonator)
    3. Crystal Units
    4. Basic Knowledge of Crystal Units
    1. HOME
    2. Electronic Components
    3. Timing Devices (Crystal Unit / Ceramic Resonator)
    4. Crystal Units
    5. Basic Knowledge of Crystal Units
    6. Basic Knowledge of How to Measure the Drive Level
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