Dual Beam Oscilloscope & Multiple Beam Oscilloscope

A dual-beam oscilloscope is somewhat similar to the dual-trace oscilloscope. The only basic difference is that there are two to separate electron beams instead of a single electron beam in the case of a dual-trace oscilloscope.

There are two separate electron beams there are two separate sets of horizontal plates. Two input signals separately feed these two sets of horizontal plates. There are two separate input channels in the dual-beam oscilloscope. Each channel has its own attenuator preamplifier and vertical amplifier.

The oscilloscope has only a single set of vertical plates. Hence, a single horizontal deflection force acts commonly on both of the electron beams. In other words, the device operates with one single time base sweep generator.

Again we know that for the proper tracing of the waveform the frequency of the input signals must be equal or an integer multiple of sweep frequency. For this reason, the frequency of both of the input signals must be the same or an integer multiple of one other.

Block Diagram of a Dual Beam Oscilloscope

There are two separate input signals. Input signal 1 has its own preamplifier and attenuator assembly. The signal entries in the vertical amplifier through the associated delay line. Similarly, input signal 2 has its own preamplifier and attenuator. The input signal 2 also enters in its vertical amplifier through its associated delay line.

dual beam oscilloscope

We can trigger that time base sweep generator through a selector switch. With this selector switch, we can trigger the sweep generator from signal 1 or from signal 2 or externally or from the supply line voltage depending on the requirement. Since the dual-beam oscilloscope has only one set of vertical plates it has only one horizontal amplifier.

Multiple Beam Oscilloscope

Principally a multiple beam oscilloscope is somewhat similar to the dual-beam oscilloscope. In a multiple beam oscilloscope, there are also more than one electron beams like a dual-beam oscilloscope. But the number of beams may be anything depending upon the requirement. Therefore a dual-beam oscilloscope is also a multiple beam oscilloscope. In other words, we call a multiple beam oscilloscope as the dual-beam oscilloscope when a multiple beam oscilloscope is having only two electron beams. In multiple-beam oscilloscope, the number of input signals and their associated attenuators, preamplifiers, vertical amplifiers depends on the number of electron beams used in the oscilloscope. But the general working principle is the same as that of a dual-beam oscilloscope.

 

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