By Susskind A.K. (ed.)
These notes from detailed in depth summer season courses on Analog-Digital conversion held at MIT from 1956-1957 specialise in difficulties created while electronic apparatus is associated with actual platforms. A "language" challenge arises, for the language of the information-processing gear is electronic and the language of communique within the remainder of the method is almost regularly within the type of electric indications or mechanical displacements analogous the the actual parameters concerned. therefore, there's a want for units to accomplish the language translation. units taht practice analog-to-digital conversion are known as coders, and units that practice digital-to-analog conversion are referred to as decoders.The material is split itno 3 components. the 1st half relates to structures points of electronic details processing that impression the standards for analog-to-digital and digital-to-analog conversion units. within the moment half, a close engineering research and review of quite a few conversion units is gifted. The 3rd half is dedicated to a case examine in response to improvement paintings performed on the Servomechanisms Laboratory of the MIT division of electric Engineering.
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Additional info for Analog-digital conversion techniques
This toggles b e t w e e n displaying sequentially (ALT mode) all traces selected by the appropriate ON control, or displaying t h e m in CHOPped mode. In this mode, very short s e g m e n t s of each trace are displayed sequentially, so that all are written in one pass, for e x a m p l e in one 10 ms period w h e n a timebase speed of l m s / d i v is selected. The s e g m e n t s follow each o t h e r so closely that to the eye t h e y appear as c o n t i n u o u s traces. To the right again are the input connectors and controls for C h a n n e l s 3 and 4.
3 shows the typical variation of input impedance versus frequency w h e n using a xl 0 passive divider probe. Another point to watch out for w h e n using such a probe is the effect of the inductance of its ground lead. This is typically 150 nH (for a 15 cm lead terminated in an 'alligator clip'), and forms a resonant circuit with the input capacitance of the probe. On fast edges, this will result in ringing in the region of 150 MHz, so for high-frequency applications it is essential to discard the ground lead and to earth the grounded nose-ring of the probe to circuit earth by the shortest possible route.
50 MHz current probe used with the AM503A current probe amplifier with its 20 A continuous and 50A peak current rating. However, a special feature of the AM503S Current Probe System utilizes the fact that the fluxes due to opposing currents are subtractive. The AM503S senses the current level in the conductor u n d e r test and feeds an equal but opposite current t h r o u g h the probe. This 'bucking current' nulls out the flux due to the current in the transformer and eliminates any core saturation.