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Crystal are use to keep the frequency of the clock from drifting. If the signal from this clock stops Thiago Silva Jersey , or is weak, or the pulses begin to vary, the electronic equipments might show intermittent faults or might stop altogether. The microprocessor pins that hold the crystal are usually called OSC IN and OSC OUT as shown in Figure 1 and the frequency is marked on the crystal. Typical examples of crystal oscillator frequency are 3.58MHZ, 4MHZ, 8MHZ, 24MHZ etc.

Testing Crystal
Crystals are quite fragile components because of their construction. Unlike a resistor or capacitor, if you drop one on the ground from a decent height Stanley N'Soki Jersey , its 50-50 bet whether it will work again. Testing the crystal is not a breeze either. You cannot just take out your trusty multimeter and plug the crystal in it. In fact, there are three right ways to test a crystal: -

(a) Using Oscilloscope
A crystal produces a sine wave when excited. It is appropriate then, to see a waveform representative of a sine wave on the clock pins. If the clock is not functioning properly, replace the crystal. In most cases this should solve the problem since microprocessors are usually very reliable. Check the crystal with power on.

(b) Frequency Counter
Frequency Counter can be use to check the frequency of the crystal. The reading must be taken when the equipment power is switch "on". Place the probe of frequency counter to the crystal pin and read the measurement. Be sure that your frequency counter meter has the range that is higher than the crystal frequency you are measuring.

(c) Crystal Checker
With this method, usually the crystal is placed in the feedback network of a transistor oscillator. If it oscillates and the LED is lighten up, this mean that the crystal is working. If the crystal doesn't work, the LED stays off. Instead of using LED Sebastien Cibois Jersey , some other crystal checker uses a panel meter to indicate if the crystal is working or not.

Jestine Yong is a electronic repairer and writer. For more information about electronic repair please visit his website at
Liu Xiang ? was defeated by Ares Merritt Sports Articles | May 9, 2012
In these three successive 60 meters hurdles, Liu Xiang made the first champion, first runner-up, and no scores with a false start, he said, he has been already looking forward this summer Presnel Kimpembe Jersey , to see back from a few stops, I must pay more attention to the details.?


Ares Merritt turned out to the champion, which was beyond Liu Xiang's expectation. Although there are many times to compete against each other, however Liu Xiang never pay attention to this opponent. This time, right - Road Merritt brought Liu Xiang big trouble. The situation is somewhat like the Daegu World Championships, Liu Xiang and Robert Naples station.? At that time, Liu Xiang had to take too much things into considered. The starting gun will not be slow? The small speakers on the starting blocks will ring? Which leg Merritt will use to hurdle? Should the starting blocks on the runway put on which side? Before setting foot on the starting blocks Moussa Sissako Jersey , everything should be arranged, which will need improvisation. However, thousands of operators, it is difficult to count to Merritt ran a 0.135 - second for the start reaction.

"I feel he start very fast, what I felt was to catch him, but it was in such a hurry." As a result, Lauding showed only 0.167 seconds of starting reaction Moussa Diaby Jersey , there is a big gap between the fastest reactions, 0.108 seconds. The start of backward was leading to the final fail and became the key reason for the defeat. "I'm in a hurry and I had to accept that I was influenced by the impact of Merritt."On the mixed zone interview, Liu Xiang was the first time frankly to admit that he has been disrupted.

It is rare to see that in the past, even to touch bar are very rare cases, it is not difficult to imagine that Liu Xiang would be anxious enough that such errors would appear. He was too eager to obtain this indoor World Championships gold medal. When the results table was showing the results of Liu Xiang, 7.49 seconds, silver metal Marquinhos Jersey , Liu Xiang admitted: "To be honest, I was really anxious, there is no other reason but my own problem."

Not chosen to do doping urine and out from the Control Center after the game, Liu Xiang was back in front of reporters. At the moment, he has taken on a black suit, as if match with the loss. ?This defeat gave me a lesson.? He said, ?I need to be more prudent and keep a good attitude in the future.? After that Marco Verratti Jersey , Liu Xiang walked away with the steady pace, as if there is no bleeding wound, however that lonely figure clearly revealed his broken heart, perhaps the blood flow in the heart of Liu Xiang.

Merritt, the first time to achieve his first World Series championship in his career, behaved very excited, and Liu Xiang was very calm and congratulated the opponent to win Loic Mbe Soh Jersey , "His personal best score is 7.34 seconds, almost the same with me, he was powerful enough to win."
Market Demand : Flocculants: Technologies and Global Markets By 2021

by smit510 · December 26, 2018

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