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{{Plugin Sidebar | {{Plugin Sidebar | ||
|manufacturer=Tektronix | |||
summary=50 MHz dual channel amplifier| | |series=500-series scopes | ||
image=Tek 1a2 new.jpg | | |type=1A2 | ||
caption=1A2 front view| | |summary=50 MHz dual channel amplifier | ||
introduced=1964 | | |image=Tek 1a2 new.jpg | ||
discontinued=1975 | | |caption=1A2 front view | ||
|introduced=1964 | |||
manuals= | |discontinued=1975 | ||
|designers=Larry Biggs | |||
|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)]] | * [[Media:070-0430-01.pdf|Tektronix 1A2 Manual (PDF, OCR, bad-OCR)]] | ||
* [[Media:Tek 1a2 notes.pdf|Tektronix 1A2 Notes (PDF, needs OCR)]] | |||
* [[Media:1a2 sn6220 parts correction.pdf|Tektronix 1A2 Parts Correction at Serial Number 6220 (PDF)]] | |||
* [[Media:TM-11-6625-2517-14.pdf|Military manual for Tektronix 1A2 (PDF)]] | |||
* [[Media:Tek 1a2 cal outline.pdf|Tektronix 1A2 Calibration Outline (PDF, 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]]. | ||
It provides a | It provides a −3 dB point of 50 MHz in a [[544]], [[546]], [[547]], or [[556]], and 50 mV/div sensitivity. | ||
It was designed by [[Larry Biggs]]. | |||
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 | 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 and channel 2 to timebase B. | ||
ten times the sensitivity at a higher price and is able to lock channel 1 to Type [[547]]'s timebase A | On the other hand, Type 1A2 can select which channel provides triggering when the mainframe is set to Plug-In mode, for scopes having this feature ([[544]], [[546]], [[547]], [[549]], [[556]], late [[555]]). | ||
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. | |||
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. | ||
{{MissingSpecs}} | |||
==Internals== | |||
1A1 and 1A2 share some mechanical design, but the circuits have few details in common. | |||
Below serial number 11000, the 1A2 uses a [[7586]] [[nuvistor]] at the front end as a cathode follower. | |||
Above serial number 11100, the front-end uses a FET for this function. | |||
After the front-end buffer, 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. | 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. | 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== | ||
| Line 52: | Line 59: | ||
Tek 1a2 b4.jpg | Tek 1a2 b4.jpg | ||
Tek 1a2 b5.jpg | Tek 1a2 b5.jpg | ||
1a2front132.jpg|1A2 serial number 132 | |||
1a2top132.jpg|1A2 serial number 132 | |||
1a2nuvistor132.jpg|1A2 serial number 132 | |||
1a2bottom132.jpg|1A2 serial number 132 | |||
</gallery> | </gallery> | ||
[[Category:500 series plugins]] | [[Category:500 series plugins]] | ||