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Storage oscilloscope tester

storage oscilloscope An instrument that is used to measure fast nonrepetitive signals. The tester generates two different ” signals for checking a digital storage oscilloscope. The first is a stepped voltage on which glitches are superimposed.

The second is a rectangular 2 kHz signal on which a 15 Hz analog signal is superimposed The first signal quickly shows whether the oscilloscope eliminates the glitches during signal processing. If it does, the measurements cannot be fully trusted. It can also be used to check the trigger function; if this is poor, it will not be able to cope with the signal properly.

The second signal shows whether at a given setting low-frequency signals remain clearly visible (they should).

The stepped voltage is generated by oscillator IC1a and a digital-to-analog converter (DAC)—see diagram. Th ( converter consists of IC2. D1-D4, R3-R6, and R9. The signal is buffered by T1. Diode D5 compensates for the forward bias of the base-emitter junction of T1. The spikes are introduced by C4.

The second signal is produced by switching T2 in rhythm with the 2 kHz signal and changing the collector voltage with the 15 Hz signal generated by oscillator IC1b.

The circuit needs a supply voltage of 9-15 V and draws a current of about 50 mA.

When the input signals stored in analog store registers can be read out at a much slower rate by the A/D converter, then the digital output of the A/D converter is stored in the digital store, and it allows operation up to 100 mega samples per second. This is the working principle of a digital storage oscilloscope.

Storage oscilloscope tester Schematic diagram

Digital Storage Oscilloscope

The digital storage oscilloscope is an instrument that gives the storage of a digital waveform or the digital copy of the waveform. It allows us to store the signal or the waveform in the digital format, and in the digital memory also it allows us to do the digital signal processing techniques over that signal. The maximum frequency measured on the digital signal oscilloscope depends upon two things they are: sampling rate of the scope and the nature of the converter. The traces in DSO are bright, highly defined, and displayed within seconds.

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