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- Aug 16, 2012, 11:02:07 AM (12 years ago)
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en/communication/measurement.php
r286 r287 8 8 <h2>Measurement and Experimental technology</h2> 9 9 10 <p>Measurement -and Experimental technology can link Communication and Computer10 <p>Measurement and Experimental technology can link Communication and Computer 11 11 Technology. Measurement technology has a long history and there have been nice and 12 12 remarkable devices.</p> … … 30 30 <img src="/shared/photos/kommunikationstechnik/universalmessgeraet.jpg" alt="Fotografie des Universalmeßgerätes" width="396" height="325" /> 31 31 <p class="bildtext"> 32 This is a remarkably functional, big and beautiful all-purpose measurement device made by Siemens & Halske (about 1905). At that time even simple objects of ut ulity were made lovely detailed. This device was used asauxiliary device for morsing purposes in the national administration of the German Empire.32 This is a remarkably functional, big and beautiful all-purpose measurement device made by Siemens & Halske (about 1905). At that time even simple objects of utility were made with lovely details. This device was used as an auxiliary device for morsing purposes in the national administration of the German Empire. 33 33 </p> 34 34 </div> … … 71 71 <img src="/shared/photos/kommunikationstechnik/loewe-kathodenstrahl.jpg" alt="Photography of the cathode ray tube" width="396" height="189" /> 72 72 <p class="bildtext"> 73 At the time where there was no television and no oscilloscope yet, the 74 <b>Cathode Ray Tube</b> was a sensation, especially at school. This was one of 75 the very first experiments where students could see that electrons have 76 almost no inertia, so they can be deflected easily at the presence of an 77 electric field. 78 <br/>This tube (with power supply on the left) from the German company 79 <b>Loewe</b> is an historical piece from the 1930s. It measures about 80 50 cm! 73 Before television and oscilloscopes, the <b>Cathode Ray Tube</b> was a sensation, especially in schools. This was one of the very first experiments where students could see that electrons have almost no inertia, so they can be deflected easily in the presence of an electric field. This tube (with power supply on the left) from the German company <b>Loewe</b> is an historical piece from the 1930s. It measures about 50 cm! 81 74 </p> 82 75 </div> … … 88 81 <p class="bildtext"> 89 82 After the currency reform in West Germany, the production 90 of mesurement devices got going again. This AEG83 of mesurement devices got going again. This <b>AEG</b> 91 84 oscilloscope was built in 1949. It seems to be an exact 92 85 replica from an AEG device of the late thirties. It is … … 94 87 market at 1938. Neither the time base of the horizontal 95 88 deflection nor the amplitude of the vertical deflection 96 are cal librated by the manufacturer. To measure89 are calibrated by the manufacturer. To measure 97 90 absolutely with this device, you always need reference sizes. 98 91 </p> … … 102 95 <img src="/shared/photos/kommunikationstechnik/phywe-oszi.jpg" alt="Photography of a Phywe demonstration oscilloscope" width="396" height="269" /> 103 96 <p class="bildtext"> 104 The "Physikalischen Werkst ätten" (<i>phsyical facilities</i>), <b>Phywe</b>,105 have built this small oscilloscope for demonstration purposes that can be97 The "Physikalischen Werkstätten" (<i>phsyical facilities</i>), <b>Phywe</b>, 98 built this small oscilloscope for demonstration purposes. It can be 106 99 used to show the electromagnetic interaction of an electron beam in E/B fields. 107 Since (CRT driven) television got a mass medium, these experiments 108 were state-of-art at those days. 100 Since (CRT driven) television was not yet a mass medium, these experiments 101 were state-of-art in those days. 102 109 103 </p> 110 104 </div> … … 121 115 The Type 555 was first sold in 1963 and is a true dual-beam oscilloscope with two individual time bases. This makes it superior compared with traditional dual-channel oscilloscopes with only a single time base and an electronic chopper for the dual-channel display. <br> 122 116 The 555 features a separate power supply which is sitting on the bottom of the oscilloscope cart (a scope mobile). All in all the 555 contains about 100 tubes - an extraordinary amount for such a device. As a result the power requirement of the 555 is quite high with about 1 kW.<br> 123 The maximum signal frequency that can be displayed with the 555 is 33 MHz - an outstanding value for the time. Oscilloscopes like the 555 were normally carried from one place to another by a cart (it is next to impossible to lift such a device as a single person). Therefore the scope mobile often had storage space for additional modules that were not regularly used.<br> 124 The 555 on display is in mint condition - a rare circumstance since most oscilloscopes from this time show signs of their heavy duty use.<a class="popup" href="/shared/photos/kommunikationstechnik/555.jpg"><b> A high resolution picture of the 555</b></a> can be seen here.</a><br> 125 The Type 564 oscilloscope on the scope mobile on the right uses a bistable storage tube - a technology that was not mature at this time. These tubes were characterized by a short life time. Most notably the brightness of the display decreased rapidly with time and the maximum beam velocity for 117 The maximum signal frequency that can be displayed with the 555 is 33 MHz - an outstanding value for the time. Oscilloscopes like the 555 were normally carried from one place to another on a cart (it is next to impossible for a single person to lift such a device). Therefore the scope mobile often had storage space for additional modules that were not regularly used.<br> 118 The 555 on display is in mint condition---a rare circumstance since most oscilloscopes from this time show signs of their heavy duty use.<a class="popup" href="/shared/photos/kommunikationstechnik/555.jpg"> <b>A high resolution picture of the 555</b></a> can be seen here.<br> 119 120 The Type 564 oscilloscope on the scope mobile on the right uses a bistable storage tube---a technology that was not mature at this time. These tubes were characterized by a short lifetime. Most notably the brightness of the display decreased rapidly with time and the maximum beam velocity for 126 121 storing images was about 500 cm/ms.<br> 127 122 Below the 564 is a Tektronix Type 453 - a small oscilloscope which is quite difficult to service and repair due to its small physical size. By the way: Modern Tektronix oscilloscopes offer bandwidths up to 80GHz! … … 135 130 <p class="bildtext">This big white board is an experience system from 136 131 <b>Leybold</b> from the early 1970s. At that time, the subject 137 "digital elect onics" was taught in the school. Students could set up138 logic systems like binary counters, full adders, flip-flops, multiplexer ,132 "digital electronics" was taught in schools. Students could set up 133 logic systems like binary counters, full adders, flip-flops, multiplexers, 139 134 etc. This was quite fascinating for students at that time. Today, in ordinary 140 schools, there is no more time for electronics in the curricul ars.</p>135 schools, there is no more time for electronics in the curriculum.</p> 141 136 </div> 142 143 <h3>The world of electronical calculating</h3> <!-- schleim... -->137 138 <h3>The world of electronical calculating</h3> 144 139 145 140 <div class="box left clear-after"> 146 141 <img src="/shared/photos/kommunikationstechnik/frequenzzaehler.jpg" alt="Photography of different frequency- and event counters" width="420" height="582" /> 147 142 <p class="bildtext"><b>Calculating requires counting</b> 148 <br/>Last but not least we show a composition of (frequency) counters from143 <br/>Last but not least, we show a composition of (frequency) counters from 149 144 different epoches. There are, among others, devices equipped with tubes (57 150 145 electron tubes) or discrete transistor logic (mostly germanium). -
en/communication/television.php
r286 r287 36 36 <div class="bildtext"> 37 37 <b>Saba Telerama</b> 38 <p>Since 1956, the German company SABA produced projection TV-sets. The advertisements said you could even watch television in light rooms which are not shaded. This promise was exaggerated: Only with a special projection screen (made by Saba) which reflects the light primarily in one direction, you can see a sufferable image. Clicking on the picture will show you an <a href="/en/devices/saba-telereama.shtm" class="go"> explanation of the Telerama projection technology.</a></p>38 <p>Since 1956, the German company SABA produced projection TV-sets. The advertisements said you could even watch television in light rooms which are not shaded. This promise was exaggerated: Only with a special projection screen (made by Saba) which reflects the light primarily in one direction, you can see a sufferable image. Clicking on the picture will show you an <a href="/en/devices/saba-telereama.shtm" class="go"> explanation of the Telerama projection technology.</a></p> 39 39 <p>On the right hand in the background you can see a multifunctional device made by Nordmende to see television, hear to broadcasting and gramophone records. On the left the concurrency device with the same features made by Telefunken. They are both made in 1954.</p> 40 40 </div> -
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en/devices/saba-telerama.php
r286 r287 30 30 <img src="/shared/photos/kommunikationstechnik/telerama-schmitt-optik.jpg" alt="Telerama-Schmitt-Optik" width="574" height="356" /> 31 31 <div class="bildtext-bildbreite" style="width: 574px;"> 32 <p>The <b>Schmitt lenses</b>, demounted fromthe Saba Telerama projection TV-set.32 <p>The <b>Schmitt lenses</b>, as used in the Saba Telerama projection TV-set. 33 33 </div> 34 34 </div> 35 35 36 36 <p> 37 The CRT (6 cm diameter) is partly visible in the pice. The light 38 coming from this tube caroms on the concave mirror (in the picture laying on 39 the floor). Afterwards it is adjusted by an special lens (on the right of the 40 box) and leaves the box, arriving at the projection screen. 41 <br />During this long way the original picture which is about 42 4,5cm x 3,5cm big is scaled up to 123cm x 97,5cm on the 43 projection screen. Consequently, the luminosity is decreasing enormously. 44 If you compute the final fraction of the original luminosity, you'll 45 understand, why this projection TV had to be set in a totally shaded room.</p> 37 The CRT (6 cm diameter) is partly visible in the picture. The light coming from this tube reflects on to the concave mirror (on the floor). The reflected light is adjusted by a special lens (on the right of the box) and leaves the assembly, arriving at the projection screen. During this process, the original picture, about 4,5cm x 3,5cm, is scaled up to 123cm x 97,5cm on the projection screen. Consequently, the luminosity is reduced enormously. Consequently, this projection TV needed to be viewed in an almost totally shaded room.</p> 46 38 </p> 47 39 -
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en/index.php
r286 r287 15 15 <li>In contrast to similar museums that normally only exhibit 16 16 the history of technology without showing their functionality, 17 almost all devices in the technikum29 are operati veand are17 almost all devices in the technikum29 are operational and are 18 18 demonstrated during the guided tours. So you get a totally 19 19 different picture of that time. This is quite absolutely … … 55 55 <h2>Opening hours</h2> 56 56 <ul> 57 <li>We currently accept only group registrations (at least 5 58 persons). Dating requests are accepted until five days 59 before the favored date.</li> 57 58 <li>We currently accept only group bookings (at least 8 people). Requests are accepted until five days before the favored date. </li> 60 59 </li> 61 60 </ul>
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