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7000 series readout system: Difference between revisions
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===Probe interface=== | ===Probe interface=== | ||
Most 7000 series plugins have rings around the BNC input sockets that allow attached probes to interface with the readout system. The probe connector includes a contact pin connecting this ring. A resistor connected to ground encodes the probe attenuation, e.g. 11 kΩ indicates a | Most 7000 series plugins have rings around the BNC input sockets that allow attached probes to interface with the readout system. The probe connector includes a contact pin connecting this ring. A resistor connected to ground encodes the probe attenuation, e.g. 11 kΩ indicates a ×10 probe and 6.8 kΩ a ×100 probe. If the probe includes an Identify switch at the tip, this connects the readout pin directly to ground.The [[Media:Tek-plugin-readout.jpg|plug-in circuit]] uses the shift instructions in time slot 1 to implement the change of range. | ||
===Complex plugins=== | ===Complex plugins=== | ||
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[[File:EPROM based 7000 series readout board.jpg|400px|right]] | [[File:EPROM based 7000 series readout board.jpg|400px|right]] | ||
Towards the end of the 7000 series lifespan, in the 2nd half of the 1980s, a re-designed readout board, | Towards the end of the 7000 series lifespan, in the 2nd half of the 1980s, a re-designed readout board, | ||
Tek part number 670-8622, was introduced, in which the character generator is based on digital values stored in a 2732 EPROM instead of Gilbert's analog ROMs. This board was installed e.g. in the [[R7103]] and [[7904A]] and still used some of the Tek-made readout ICs like the timing generator. | Tek part number 670-8622, was introduced, in which the character generator is based on digital values stored in a 2732 EPROM instead of Gilbert's analog ROMs. This board was installed e.g. in the [[R7103]] and [[7904A]] and still used some of the Tek-made readout ICs like the timing generator. The design is similar to the readout mechanism in the [[2465]] series. | ||
The number of display points was increased to up to 16 per character. The presence of this board can be detected from the outside by looking at the readout characters which are straight up but were italicized in the analog version (which was done the analog way too, by adding some 10% of the vertical signal to the horizontal channel). The character style itself is also different — for example, the "V" in the classic board has just two straight lines, whereas they are angled in the digital version. | The number of display points was increased to up to 16 per character. The presence of this board can be detected from the outside by looking at the readout characters which are straight up but were italicized in the analog version (which was done the analog way too, by adding some 10% of the vertical signal to the horizontal channel). The character style itself is also different — for example, the "V" in the classic board has just two straight lines, whereas they are angled in the digital version. | ||