Transistor Tester
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Crystal are use to keep the frequency of the clock from drifting. If the signal from this clock stops, 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, 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 doesnÂ’t work, the LED stays off. Instead of using LED, 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 http://www.noahtec.com
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Tivoli Audio Portable Audio Laboratory - Portable radio - white, chrome Amazon.com Product Description New electronics that resemble old electronics are all the rage these days. With a case that looks like it belongs in a mad scientist's laboratory, the Tivoli iPal is on the vanguard of retro style. In fact, the "Pal" stands for Portable Audio Laboratory--a cheeky reference to the unit's obvious Geiger counter-inspired design. Fortunately, the iPal does more than just... |
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Steren Pocket Size Digital Multimeter/Transistor Tester $12.19 ... |
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New-Digital Multimeter And Transistor Tester - T08082 $91.45 602-040 STEREN DIGITAL MULTI-METER TRANS. TESTER METER & TRANS. TESTERThree 1/2-digit adjustable display DMM1 high-contrast LCD display30-position rotary range switchDiode and 50 continuity beeperIncludes 9V battery, 3' 1,500V double-insulated test leads and leatherette carrying case... |
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NightFire Bipolar Transistor Tester Kit $8.99 This is the Bipolar Transistor Tester Kit. It will test your Bipolar Transistors. When there is no Transistor to be tested, the LM555 will light up both LEDs. When a good NPN Transistor is put in, the GREEN LED will come on. When a good PNP Transistor is put in, the RED LED will come on. If either has a Collector-to-Emitter short, neither of the LEDs will come on. If the Transistor to be tested h... |
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Diode/Transistor Tester Kit GOTO KIT MENU Checks transistors and diodes in circuit. Identifies NPN or PNP transistors. Checks small or large power types.... |
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