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315: Difference between revisions
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The move to use a 3” CRT rather than a 5” was to produce a “portable” oscilloscope, which the 315-D was promoted as. With dimensions considerably smaller than the 5” models and only weighing a modest 36 pounds, it offers a lot of performance in a small package. In [[introduced_in_1956|1956]], Tek introduced a rack mount version, the 315R. One has to wonder what the benefit of a 3" screen is when it was packaged is a rack sized instrument. | The move to use a 3” CRT rather than a 5” was to produce a “portable” oscilloscope, which the 315-D was promoted as. With dimensions considerably smaller than the 5” models and only weighing a modest 36 pounds, it offers a lot of performance in a small package. In [[introduced_in_1956|1956]], Tek introduced a rack mount version, the 315R. One has to wonder what the benefit of a 3" screen is when it was packaged is a rack sized instrument. | ||
As with earlier 5” Tektronix scopes, the “D” suffix indicates the inclusion of a delay line in the vertical signal path. The delay line resides between the pre-amplifier, where the trigger signal is picked off and the final vertical amplifier. The delay line allows time for the sweep to start and the unblanking to turn the trace on slightly before the trace is deflected, so the user can see all of the rising edge of the signal which triggered the scope. The original 511, Tek’s first scope sold, did not have a delay line. It was added with a few other circuit enhancements to become the 511-AD model. The delay line was offered as a “delete” option on early scopes, with the version without the delay line selling for $50 less. Apparently most customers ordered the delay line versions, and the 315 was the last scope introduced with the D suffix. | As with earlier 5” Tektronix scopes, the “D” suffix indicates the inclusion of a delay line in the vertical signal path. The delay line resides between the pre-amplifier, where the trigger signal is picked off and the final vertical amplifier. The delay line allows time for the sweep to start and the unblanking to turn the trace on slightly before the trace is deflected, so the user can see all of the rising edge of the signal which triggered the scope. The original [[511]], Tek’s first scope sold, did not have a delay line. It was added with a few other circuit enhancements to become the 511-AD model. The delay line was offered as a “delete” option on early scopes, with the version without the delay line selling for $50 less. Apparently most customers ordered the delay line versions, and the 315 was the last scope introduced with the D suffix. | ||
Even so, the [http://bitsavers.org/pdf/tektronix/catalog/Tektronix_Catalog_1953-03.pdf 1953 catalog] which was the first the 315-D appeared in did not list the version without the delay line. It is quite possible that no plain 315 models were ever sold. | Even so, the [http://bitsavers.org/pdf/tektronix/catalog/Tektronix_Catalog_1953-03.pdf 1953 catalog] which was the first the 315-D appeared in did not list the version without the delay line. It is quite possible that no plain 315 models were ever sold. | ||