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Bandwidth

About D.E.V.I.C.E.
About D.E.V.I.C.E.

D.E.V.I.C.E. is an encyclopedia of terms used by manufacturers of test and measurement equipment. T&M Atlantic created this service to better explain the functionality of instruments it offers, and to highlight the latest developments in the world of T&M Atlantic. We are using such tools as flash and animation to bring words and pictures to life and to create not just an understanding but also an appreciation for technology that goes into the design of every instrument.

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Oscilloscope bandwidth is a frequency range (“Fl - Fh” in the pic.) where oscilloscope signal attenuation doesn’t exceed – 3 dB relative to reference frequency signal (“Fr” in the pic.). Reference bandwidth shouldn’t exceed 5% of bandwidth upper frequency limit. For general purpose oscilloscopes reference frequency is usually taken as 1kHz. In addition such oscilloscopes usually have “AC-DC” input mode switching capability. In DC mode bandwidth lower frequency equals 0 (Fl = 0). That allows working with low-frequency signals, to the direct current, as well as with the signals which have a constant component. Also all oscilloscopes have bandwidth limit function for the improving of signal/noise ratio during regular signals registration.

Bandwidth

There is a certain connection between the bandwidth upper frequency and a scope rise time:

Fh(MHz) = 0.35 / tr (μs)

This ratio is right if the rise time is measured between 10% and 90% levels from the amplitude of rectangular test signal on the scope display. The whole device analog tract is considered equivalent to the periodical link of the first order. For general purpose oscilloscopes such conditions are usually satisfied.


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Units Converter
About Units Converter
This universal gadget converts 10 types of measurement units: Length, Weight, Temperature, Volume, Area, Speed, Time, Pressure and Energy. It is easy to use and is available in English and Spanish.
  1. Choose your language
  2. Choose the measurement type
  3. Enter values
  4. Receive results
  5. Email link to friends (optional)
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