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7704A: Difference between revisions
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(New page: The Tektronix 7704A is a modular oscilloscope that takes two 7000-series vertical plug-ins and two horizontal plug-ins. Its bandwidth is about 200MHz, depending on plug-ins.) |
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The Tektronix 7704A is a modular oscilloscope that takes two 7000-series vertical plug-ins | The Tektronix 7704A is a modular oscilloscope that takes two 7000-series vertical plug-ins | ||
and two horizontal plug-ins. Its bandwidth is about 200MHz, depending on plug-ins. | and two horizontal plug-ins. Its bandwidth is about 200MHz, depending on plug-ins. | ||
There was also an option (option 9) to have the bandwidth extended to 250MHz. The | |||
7704A followed the [[7704]], improving on the bandwidth and introducing modularity. | |||
The 7704A has a special modular construction. At the bottom is the "acquisition unit", | |||
which contains the power supply, plug-in slots, and main interface board. On top is | |||
the "display unit", which contains the CRT, HV power supply, and output amplifiers for | |||
driving the deflection plates of the CRT. These units detach. A large multipin connector | |||
passes signals and power from the acquisition unit to the display unit. It is important | |||
not to damage this connector when assembling or disassembling the units. | |||
An optional component, the [[P7001]] Processing Unit, can be added to a 7704A between the | |||
acquisition unit and the display unit. | |||
The 7704A SMPS uses a custom Tek chip to implement the control functions. | |||
Since the SMPS is a kind of oscillator, there is the issue of how it will start when it is first powered up. | |||
Early 7704As use a diac in the starter circuit. | |||
Later 7704As use a unijunction transistor in the starter circuit. | |||