7000 series readout system: Difference between revisions

7000 series readout system (view source)

112 bytes added , 27 January 2016

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 ===Readout modes===
 [[File:tek_readout_beam.jpg|thumb|right|200px|Signal beam interruption by readout seen on beam 2 of a [[7844]]]]
-The standard mode of operation for the readout is free-running, i.e. in regular intervals that are asynchronous to the sweep, beam control is switched to the readout generator.  In certain conditions, this can cause visible gaps in the signal display.  When the readout intensity control is turned to minimum, this switching is disabled and the signal trace is not interrupted at all.
+The standard mode of operation for the readout is free-running, i.e. in regular intervals that are asynchronous to the sweep, beam control is switched to the readout generator.  In certain conditions, this can cause visible gaps in the signal display.  When the readout intensity control is turned to minimum, this switching is disabled and the signal trace is not interrupted at all. (In the [[7844]] with its two physically separate beams, readout uses beam 2, and beam 1 is never interrupted.)
 A sliding switch on the analog ROM readout board (internal to the scope) allows the operator to select "gate triggered" mode, in which the readout signal is produced only after a sweep has occurred.  The advantage of this mode is that the beam is not interrupted while drawing the signal, however, if no sweep occurs there is no readout, and if the sweep is slow, the readout flickers.