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System bandwidth determines the oscilloscope's ability to measure analog signals. Specifically, it determines how accurately the instrument can measure

Bandwidth is also a key determinant of price.

An oscilloscope's sampling rate is similar to a camera's frame rate and determines how much waveform detail the oscilloscope can capture.

Digital oscilloscopes sample, store and display analog channels. Generally speaking, the more channels the better, but adding channels also increases the price.

Good measurements start at the probe tip. The oscilloscope and probe work as a system, so be sure to consider the probe when selecting an oscilloscope.

Triggering provides a stable display that allows you to zoom in on specific parts of a complex waveform.

Record length is the number of points in one complete waveform record. Oscilloscopes can only store a limited number of sample points, so generally speaking, the larger the record length, the better.

Automatic waveform measurements make it easier to obtain accurate digital readouts.

An oscilloscope should be easy to operate, even for the occasional user. The user interface can take up a lot of time calculating the "information you need".

Connecting the oscilloscope directly to a computer, or transferring data via portable media, enables advanced analysis and simplifies the process of documenting and sharing results.

Most system-level (computer-to-computer) communications are carried out over serial data links. Even on today's circuit boards, most chip-to-chip data is carried over serial buses.

After you’ve researched all the specs and features, you should take some time to look into the expected after-sales support.

■ Comprehensive manufacturer website in local language

■ Customer support via email, online chat or phone

■ Extensive distributor network

■ Downloadable manuals

■ Well-known and easily accessible repair and calibration facilities

■ Application guides to help you understand the technology and learn specific measurement data

■ Software and Drivers
Many support programs are also available to help with the research phase. Taking advantage of these support resources during the selection process can help you avoid being ripped off after the purchase.

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