315: Difference between revisions

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The Tektronix Type 315 and 315D are single-channel oscilloscopes

[[introduced in 1952|introduced in September 1952]].

They use [[3WP2]] 3-inch CRTs ~~and are mechanically similar to~~

They use [[3WP2]] 3-inch CRTs.

~~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.~~

== Historic Context ==

Tektronix engineer Frank Hood recollects:

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</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.

== Delay Line ==

As with earlier 5” Tektronix scopes, the “D” suffix indicates the inclusion of

a delay line in the vertical signal path.

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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.

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.

@@ Line 1: / Line 1: @@
 The Tektronix Type 315 and 315D are single-channel oscilloscopes
 [[introduced in 1952|introduced in September 1952]].
-They use [[3WP2]] 3-inch CRTs and are mechanically similar to
+They use [[3WP2]] 3-inch CRTs.
-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
-x, and the 55x, 56x, 57x, and 58x designs.
+== Historic Context ==
 Tektronix engineer Frank Hood recollects:
 <blockquote>
@@ Line 13: / Line 10: @@
 </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
+x, 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.
+== Delay Line ==
 As with earlier 5” Tektronix scopes, the “D” suffix indicates the inclusion of
 a delay line in the vertical signal path.
@@ Line 22: / Line 28: @@
 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.
+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.

315: Difference between revisions

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