82: Difference between revisions
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==Internals== | ==Internals== | ||
The front end of the Type 82 is a [[7586]] [[nuvistor]] cathode-follower, | The front end of the Type 82 is a [[7586]] [[nuvistor]] cathode-follower, followed by bipolar diff-amps | ||
followed by bipolar diff-amps and diode channel switching, | and diode channel switching, followed by a [[distributed amplifier|distributed output amplifier]] made | ||
followed by a [[distributed amplifier|distributed output amplifier]] made of three [[6DJ8]] tubes, | of three [[6DJ8]] tubes, with differential 93 Ω outputs. | ||
with differential | |||
The use of a distributed amplifier in a plug-in is unusual. | The use of a distributed amplifier in a plug-in is unusual. | ||
Note that the 58x series differs from [[500-series scopes]] mainly in that | Note that the 58x series differs from [[500-series scopes]] mainly in that the vertical | ||
the vertical signal interface between the plug-in and the mainframe is | signal [[580 Series plug-in interface|interface between the plug-in and the mainframe]] | ||
a low controlled impedance (93 ohms), as opposed to other 500-series scopes | is a low controlled impedance (93 ohms), as opposed to other 500-series scopes | ||
that present a high impedance to the plug-in. | that present a high impedance to the plug-in. | ||
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positions were lousey. I think this was fixed on the later 82's as Tek learned | positions were lousey. I think this was fixed on the later 82's as Tek learned | ||
how to make better attenuators. If you have an early 82 and need to look at | how to make better attenuators. If you have an early 82 and need to look at | ||
high frequency signals on the less sensitive ranges, the answer is to | high frequency signals on the less sensitive ranges, the answer is to get ×100 | ||
probes and use them on the more sensitive ranges where the frequency response is | probes and use them on the more sensitive ranges where the frequency response is | ||
better. | better. | ||
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<gallery> | <gallery> | ||
File:82_front.jpg|Front view, early style | File:82_front.jpg|Front view, early style | ||
File:82_left.jpg|Left view | File:82_left.jpg|Left view | ||
File:82_top.jpg|Top view | File:82_top.jpg|Top view | ||
File:82_right.jpg|Right view | File:82_right.jpg|Right view | ||
File:Type 82 top.jpg | File:Type 82 top.jpg | ||