Extech Oscilloscopes - Scopes
An oscilloscope is a device used to study electronic waveforms. Its display shows the waveform’s shape, and how it changes over time, with the vertical axis representing voltage, and the horizontal axis representing time. Many scopes contain very advanced, built in tools which make analysis and debugging quick and easy.
Oscilloscopes are available in many different styles and levels of functionality, suitable for countless applications. The most popular styles are:
- Digital
- Analog
- Mixed Signal
- Portable
Digital oscilloscopes are very advanced products, which convert analog waveforms into digital signals. Digital oscilloscopes feature memory capabilities, as well as powerful software, enabling users to quickly scan an acquisition for anomalies and events of interest.
Analog oscilloscopes are an older technology, but offer real time response, showing the immediate representation of a waveform on its screen. Analog oscilloscopes feature high resolution and fast update rates. For applications where you must view the waveform in real time, an analog unit may be preferable.
Mixed signal oscilloscopes are specialized digital units – these have 2 or 4 analog channels, but also contain a logic analyzer to capture and record digital data.
Portable oscilloscopes are battery powered, ideal for use in the field. For instances where there is no access to line power, or testing must be done outdoors, a portable oscilloscope is the ideal product.
There are several important factors to consider when selecting an oscilloscope:
- Number of channels
- Sampling rate
- Bandwidth
- Type and quantity of interfaces
If your oscilloscope does not have the proper amount of bandwidth for your application, it will not be possible to obtain accurate readings. The higher the input signal frequency is, the higher the bandwidth which will be required. If there is doubt about the amount of bandwidth you will need, it is best to choose the next higher scope. Bandwidth can usually be calculated by this formula: BANDWIDTH = (0.35 / rise time of the signal)