Contents
How is voltage physically measured?
A device that measures current is called an “ammeter” and a device that measured voltage is called a “voltmeter”. Nowadays, these are usually found within the same physical device (a “multimeter”), which can also measure resistance (by measuring voltage and current, resistance can easily determined).
How do crystal oscillators work?
The crystal oscillator circuit sustains oscillation by taking a voltage signal from the quartz resonator, amplifying it, and feeding it back to the resonator. The rate of expansion and contraction of the quartz is the resonant frequency, and is determined by the cut and size of the crystal.
What is SI unit of voltage?
The SI unit for voltage is Volt and is represented by the letter v. volt is a derived SI unit of electromotive force or electric potential. It can also be expressed as ampere times ohm, joule per coulomb or watt per ampere.
Can a crystal be used to test a circuit?
It is interesting that because of the resonance of the crystal, the voltage on the scope can be much higher than the input voltage from the signal generator. This is a simple test, but effective. Of course, you could also have a little oscillator and see what the crystal does in a real circuit.
What should the Crystal Drive level be at?
Drive level should be maintained at the minimum levels necessary to initiate proper start-up and still achieve a steady state of oscillation. For a parallel-resonant oscillator, the crystal current equals the root means square voltage across the load capacitor divided by the load capacitor’s reactance at the oscillator frequency.
Why is the voltage of a crystal higher than the signal generator?
It is interesting that because of the resonance of the crystal, the voltage on the scope can be much higher than the input voltage from the signal generator. This is a simple test, but effective.
How do you check the frequency of a crystal?
Put the probe of the meter or frequency counter to the crystal pin and read the measurement. Make sure your frequency counter meter has the range that is higher than the crystal frequency you are checking. If the crystal is 8 mhz then your meter should have the range to be able to check that frequency.