Scientific knowledge - Instrumentation Maintenance Notes 1. When using a multimeter ohm, remember not to live measurements. 2. Use a logical pen detection signal oscilloscope, pay attention not to make contact with the two probes simultaneously measuring pins, because the essence of this case is that in the case of a short circuit powering. 3. To check the power of the filter capacitor should first positive and negative terminal electrolytic capacitors look, but do not use the pen instead of the wire-line short-circuit the capacitor discharge, because it is easy to blow the wire. 220V can take a lead in the head with a month, 60 ~ 100W lamp, connected to both ends of the capacitor discharge lamp will flash instantly. 4. Under wet conditions overhaul instrument failure, measured with a multimeter on the printed circuit which each point is smooth is necessary, because the main fault in this case is copper corrosion. 5. Maintenance meter internal circuits, if the contacts and the circuit board mounting element coated insulating varnish, each measuring point can be an ordinary hand stitches welding parameters on the table pen multimeter to directly measure the paint piercing points, while do not have a large area of ??peeling paint. 6. Do not hot plug a variety of panels and plugs. Because under power, the control panel will produce a strong plug induced electromotive force, then instantly back high voltage, it is easy to damage the corresponding panels and plug. 7. Do not blindly Luanqiao tinker overhaul to avoid the expansion of the fault, the more bad repair. 8. Remove and adjust the instrument, you should record the original location to recover. 9. repairing precision instruments, such as small parts Danfei accidentally, you should first determine where might fly, do not find what East and West at the turn, you can take a magnet scanning and scanning method to find the line of sight. In short, the instrumentation maintenance work, should first understand the basic principles of instrumentation and control electronics-related knowledge and skills, and should be ready for all instrumentation specifications, drawings and other technical data, in addition should develop a Good quality of work, thus improving the efficiency of maintenance work in instrumentation, and reduce errors. Scientific knowledge - Applications common electronic measuring instruments (1) Oscilloscopes is an electronic measuring instrument voltage waveform, it can be measured voltage variation of the signal over time, with a graphical display. Oscilloscope not only intuitive and visually observe the changes in the physical picture of the test, and it shows through the waveform, voltage and current measurements, to compare the frequency and phase, as well as depicting characteristic curves. (2) the signal generator signal generator (including function generator) for maintenance, provided the source debug electronic equipment and instruments. It is a way to produce a certain waveform, frequency and amplitude of the oscillator. For example: produce sine, square, triangle, ramp, and a rectangular pulse wave. (3) transistor curve tracers transistor characteristics Tracer is a dedicated oscilloscope, it can directly observe a variety of transistor characteristics and the song of the cluster. For example: a transistor common emitter, common base and the input common set of three-connected, the output characteristics and feedback characteristics; transistor forward and reverse characteristics; or Zener voltage of the regulator; it can measure transistor strike breakdown voltage, saturation current. (4) IC tester Such equipment can TII, PMOS, CMOS digital integrated circuits functional and parametric testing, but also to determine the chip erase character models and on-line functional testing of integrated circuits, online testing. (5) LCR parametric tester inductance, capacitance, resistance parameter measuring instrument, not only can automatically determine the elements in nature and graphic symbols can be displayed, and display its value. Can measure Q. D. Z, Lp, Ls, Cp, Cs, Kp. Ks and other parameters, and shows an equivalent circuit pattern. (6) The spectrum analyzer spectrum analyzer has been widely applied in the frequency domain signal analysis, testing, research and maintenance. It can simultaneously measure the amplitude and frequency of the signal, comparing the test composition and the multi-channel signal analysis signal. Mobile phones can also test signal and RF circuits logic. For example: the control signal, the baseband signal, the RF circuit of the local oscillator signal, an intermediate frequency signal, the transmitted signal and other logic circuits. This article comes from ︰http: //www.boqu17.com (please indicate the source) Instrument Co., Ltd. Shanghai win 

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