32,948
edits
No edit summary |
No edit summary |
||
Line 1: | Line 1: | ||
The Tektronix Type 315 and 315D are single-channel oscilloscopes | The Tektronix Type 315 and 315D are single-channel oscilloscopes | ||
[[introduced in 1952|introduced in September 1952]]. | [[introduced in 1952|introduced in September 1952]]. | ||
They use [[3WP2]] 3-inch CRTs | They use [[3WP2]] 3-inch CRTs. | ||
== Historic Context == | |||
Tektronix engineer Frank Hood recollects: | Tektronix engineer Frank Hood recollects: | ||
<blockquote> | <blockquote> | ||
Line 13: | Line 10: | ||
</blockquote> | </blockquote> | ||
== Case Design == | |||
The 315 is mechanically similar to | |||
early 500-series monolithic scopes such as the [[511|511A]]. | |||
The scope slides out of the case instead of having | |||
removable side covers as were used in the later 53x and | |||
54x, and the 55x, 56x, 57x, and 58x designs. | |||
== 3" CRT == | |||
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 as 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 as a rack sized instrument. | ||
== Delay Line == | |||
As with earlier 5” Tektronix scopes, the “D” suffix indicates the inclusion of | As with earlier 5” Tektronix scopes, the “D” suffix indicates the inclusion of | ||
a delay line in the vertical signal path. | a delay line in the vertical signal path. | ||
Line 22: | Line 28: | ||
to turn the trace on slightly before the trace is deflected, | 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. | 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. | 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. | ||
== Pricing == | |||
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. | ||