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''... more techniques ...''
''... more techniques ...''
= Hardware issues =
Here is a [http://www.eevblog.com/2010/05/11/eevblog-86-buy-a-real-analog-oscilloscope-please/ useful discussion] comparing low-cost USB oscilloscopes with older analog scopes available for comparable prices; it is a 9-minute video, with a useful forum-type discussion (some mildly rude language is used to describe USB scopes). The conclusion is that the low-cost USB DSOs have attenuators and triggering circuits which do not perform well at higher frequencies, and are not recommended. Quality DSOs do not suffer from these problems, but all except the very best and most expensive have storage limitations which cause problems in the particular case of observing a high frequency signal at a time/div setting much longer than its period, e.g., two complete TV fields at a setting of 40msec/div.
= Open Source Oscilloscopes =
= Open Source Oscilloscopes =

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