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7934: Difference between revisions
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The 7934 makes extensive use of custom integrated circuits and hybrid circuits. With the exception of the on-screen readout circuit, the signal path is completely differential and all of the internal wiring is 50-ohm coax. | The 7934 makes extensive use of custom integrated circuits and hybrid circuits. With the exception of the on-screen readout circuit, the signal path is completely differential and all of the internal wiring is 50-ohm coax. | ||
Many modes of operation are available on the 7934 | Many orthogonal modes of operation are available on the 7934, which control the vertical mode, horizontal mode, storage mode, and triggering: | ||
Storage has normal, bi-stable (standard and "fast"), variable-persistence (standard and "fast") modes, as well as independently-switchable reduced-scan mode (to aid high-speed writing) and timed auto-erase. | |||
The mainframe has the usual analog ch1/ch2/alt/chop/add vertical-mode functions for the two vertical bays, though in the case of the 7934, the two channels are replaced by "left" and "right" to indicate that each mode will slave the vertical deflection to that vertical bay rather than a specific channel. Multichannel plug-ins have internal switching, synchronized by a signal from the mainframe | |||
to both vertical bays, which allows the same vertical-mode functions ''within'' each vertical bay plug-in (this is what enables the 7934 to show up to four channels). | |||
Both horizontal compartments are triggerable from either ''vertical'' compartment, through an internal signal path. Amplifier plug-ins with two channels provide a switch to select which channel will be given to the mainframe for routing to the triggers. The horizontal modes (A/B/alt/chop) allow the horizontal deflection to be controlled by either the A or B compartment only, or by both, on a time-sharing basis. The mainframe also provides hold-off signals between the two horizontal, which allows a delaying time-base in the A compartment to trigger a delayed time-base in the B compartment. Both the delaying and delayed timebases can be displayed on the screen at once by selecting the chop horizontal mode. | |||