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manuals= | manuals= | ||
* [http://w140.com/mmm/tek-1a2.pdf Tektronix 1A2 Manual (PDF)] | * [http://w140.com/mmm/tek-1a2.pdf Tektronix 1A2 Manual (PDF)] | ||
* [[Media:070-0430-01.pdf|Tektronix 1A2 Manual (PDF, OCR, bad-OCR)]] | |||
* [[Media:Tek 1a2 notes.pdf|Tektronix 1A2 Notes (PDF, needs OCR)]] | |||
}} | }} | ||
The '''Tektronix 1A2''' is a two-channel plug-in amplifier for [[500-series scopes]]. | The '''Tektronix 1A2''' is a two-channel plug-in amplifier for [[500-series scopes]]. | ||
50 MHz in a [[544]], [[546]], or [[ | It provides a −3 dB point of 50 MHz in a [[544]], [[546]], [[547]], or [[556]], and 50 mV/div sensitivity. | ||
The Type 1A2 was [[introduced in 1964]] together with Types [[1A1]], [[543|543B]], [[545|545B]], [[544]], [[546]], and [[547]]. | The Type 1A2 was [[introduced in 1964]] together with Types [[1A1]], [[543|543B]], [[545|545B]], [[544]], [[546]], and [[547]]. | ||
It was designed to replace the venerable [[CA|Type CA]], while the [[1A1]] delivered | |||
ten times the sensitivity at a higher price and is able to lock channel 1 to Type [[547]]'s timebase A | ten times the sensitivity at a higher price and is able to lock channel 1 to Type [[547]]'s timebase A | ||
and channel 2 to timebase B. On the other hand, Type 1A2 can select which channel provides triggering | and channel 2 to timebase B. On the other hand, Type 1A2 can select which channel provides triggering | ||
when the mainframe is set to Plug-In mode. | when the mainframe is set to Plug-In mode, for scopes having this feature ([[544]], [[546]], [[547]], [[549]], [[556]], late [[555]]). | ||
The 1A2 remained available until the [[500-series scopes|500-series scope line]] was discontinued. | The 1A2 remained available until the [[500-series scopes|500-series scope line]] was discontinued. | ||
The 1A2 uses a [[7586]] [[nuvistor]] at the front end as a cathode follower. Then one input of an NPN differential amplifier is driven to produce a differential current-mode signal at the collectors | {{MissingSpecs}} | ||
==Internals== | |||
1A1 and 1A2 share some mechanical design, but the circuits have few details in common. | |||
The 1A2 uses a [[7586]] [[nuvistor]] at the front end as a cathode follower. | |||
Then one input of an NPN differential amplifier is driven to produce a differential current-mode signal at the collectors. | |||
Silicon diodes form an analog multiplexer that switches between the two inputs. | |||
A cross-coupled pair of PNP transistors forms a multivibrator that generates the voltages that control the diodes that select the input channel. | |||
==Pictures== | ==Pictures== | ||
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<gallery> | <gallery> | ||
Tek 1a2 new.jpg | Tek 1a2 new.jpg | ||
Tek 1a2 front.jpg | |||
Tek 1a2 top.jpg | |||
Tek 1a2 rear.jpg | |||
Tek 1a2 left.jpg|1A2 right | Tek 1a2 left.jpg|1A2 right | ||
Tek 1a2 right.jpg|1A2 left | Tek 1a2 right.jpg|1A2 left | ||
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Tek 1a2 front2.jpg | Tek 1a2 front2.jpg | ||
Tek 1a2 front3.jpg | Tek 1a2 front3.jpg | ||
Tek 1a2 b1.jpg | |||
Tek 1a2 b2.jpg | |||
Tek 1a2 b3.jpg | |||
Tek 1a2 b4.jpg | |||
Tek 1a2 b5.jpg | |||
</gallery> | </gallery> | ||
[[Category:500 series plugins]] | [[Category:500 series plugins]] | ||