Senior engineers teach you how to use the oscilloscope
1. Many engineers directly pick up the probe and test it without checking whether the probe needs to be compensated and whether the oscilloscope needs to be calibrated. Only in some large companies or trained engineers will do the preparatory work before use.
Oscilloscopes need to be self-calibrated before use and require probe compensation adjustments, which are performed to match the probe to the input channel.
When operating the instrument for the first time and when displaying data from multiple input channels at the same time, it may be necessary to calibrate the data both vertically and horizontally to synchronise time base, amplitude and position. For example, calibration is required when a significant temperature change (> 5°) occurs.
1. Disconnect any probes or cables from the channel input connectors. Ensure that the instrument is running and has warmed up for a period of time. r In the File menu, select Selfalignment.
2. On the Control tab, click Start Alignment. 3.
3. In the R alignment state field. The results of each calibration step for each input channel are displayed on the Results tab.
2 Testing Voltage Ripple
Many power supply engineers don't pay that much attention to ripple measurements and take the test for granted. The different ways of using the oscilloscope lead to a big difference in the test results. As shown in Figure 4 and Figure 5 below, for the same product with the same test point, due to differences in testing methods, resulting in significant differences in test results. Ripple for the power supply is an important parameter, but due to their own operational problems and lead to do the test does not pass, and waste a lot of manpower and cost to rectify is not worth it.
Sometimes your customers due to the use of the instrument and attention to the instrument is not enough, resulting in the test data error. But your own side of the product But their side of the product and there is no problem, so how to say it does not make sense, so that customers still think it is cheating them, so the test method is very important. Pay attention to these details, you can save a lot of time, so that their ability to a higher level.
Oscilloscope test value itself there is an error (here I will not explain for the time being). Now many companies require the value of the test waveform graph as a basis for judgement. In fact, the oscilloscope is only the process of testing the voltage change over time, mainly in debugging to capture the waveform. Specific measurements of DC voltage RMS amount of accuracy is not as good as the value of the digital multimeter. Oscilloscopes are also calibrated to the DC accuracy of the indicators of the multimeter as a reference. But more and more companies and engineers to oscilloscope value as the real value, then we can only try to do is the least test error.
