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1A2: Difference between revisions
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50 MHz in a [[544]], [[546]], or [[547]], and 50 mV/div sensitivity. | 50 MHz in a [[544]], [[546]], or [[547]], 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 | ||
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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. | 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. | |||
==Specifications== | ==Specifications== | ||