By Ian Hickman
Electronic garage oscilloscopes have lengthy in view that thoroughly supplanted analog garage oscilloscopes and feature reached a level of class and function which permit them to rival the main complicated genuine time oscilloscopes. during this entire instruction manual, which gives a realistic vade mecum for the engineer, Ian Hickman describes how they paintings and the way to exploit them to top virtue. a variety of types is out there. This e-book features a consultant to all makes and versions and may be most sensible saved beside the software for immediate reference. it's going to even be a such a lot valuable advisor to the topic for college kids and trainees. Ian Hickman is an skilled fashion designer and writer of best-selling titles together with 'Oscilloscopes: how one can Use Them, How They Work', Newnes sensible Radio Frequency Handbook', 'Analog Electronics' and 'Analog Circuits Cookbook'.
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Additional resources for Digital Storage Oscilloscopes
When a trigger event stores a high speed transient, it does so by stopping the CCD clock. This freezes a string of 512 analog samples in the CCD delay line. A lower frequency clock is now applied so that instead of spilling out of the end of the CCD delay line at up to 500Ms/s, the samples now trickle out at a rate within the capabilities of a fairly modest, inexpensive ADC. In refreshed mode, the ADC 38 Digitising converts only every umpteenth sample from the delay line (via an S/H), building up the picture in equivalent time, whenever the CCD clock frequency exceeds the maximum ADC conversion rate.
Gl ......... ILL ..... IIL__2_L . . . . . . . L ..................... 3 The autoranging TEKSCOPE combines the functions of a digital multimeter/frequency meter and a IOOMHz digital storage oscilloscope. 2 being no longer required. One potential problem with the display of signals on a digital storage oscilloscope is aliasing. This phenomenon results in a waveform of one frequency apparently displaying a quite different (usually much lower) frequency. There are two quite different forms, perceptual aliasing (an artefact of the dot display, and covered in Chapter 9), and true afiasing.
_ . . . . . . . . . . . . . . ~ Input Sampling clock C ~ . ~ . . . . . . . . . . . . . . . . . . . . . 4 A two pass analog to digital converter. ) in this chapter. This concerns charge-coupled devices (CCDs), which can alleviate the cost/speed trade-off of analog to digital conversion. Charge-coupled devices have been available for many years. They are sampled analog clocked delay lines in which a packet of charge, representing the amplitude of the input voltage at a given instant, is shunted along from one stage to the next at each clock pulse.