汽车示波器的使用操作（Operation of automobile oscilloscope）.docVIP

汽车示波器的使用操作（Operation of automobile oscilloscope） 1. matters needing attention When testing the ignition high voltage line, a dedicated capacitor probe must be used, and the oscilloscope probe cannot be directly connected to the ignition secondary circuit. When using an automobile oscilloscope, keep away from heat sources, such as exhaust pipes, catalytic converters, etc. the temperature is too high to damage the instrument. The car oscilloscope should pay attention to the test line as far as possible from the fan blades, belts and other rotating parts, and figure 1 is the fan blade cutting test line waveform. When testing, it is confirmed that the hydraulic support of the engine cover is good, which prevents the engine head from damaging when the engine head falls automatically or damages the automobile oscillograph. In the road test, do not put the car oscilloscope above the instrument stand, it is better to take it in hand test. 2. signal frequency and time base selection The time base / frequency meter is used to select the time base according to the signal frequency or to determine the frequency of the displayed waveform. Using the method of time base / frequency table: cycle waveform display screen by computing (1-5) method was used to determine the automobile oscilloscope signal frequency meter, on the left in the first column is the frequency determine the number of other columns for the current base. 3. oscilloscope settings The test of an unknown signal by oscilloscope, how to set the oscilloscope is a very complex thing, this section shows that the automotive oscilloscope to capture the waveform, the basic method of setting the oscilloscope, it can help readers to understand and grasp the essentials of oscilloscope settings. Determine the time base setting according to the signal frequency. Table 1 time base frequency conversion table Hz The number of waveform loops displayed by an oscilloscope One Two Three Four Five Ten 10ms 10ms 50ms 50ms 50ms Twenty 5m