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3A9: Difference between revisions
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The '''Tektronix 3A9''' is a differential amplifier plug-in [[introduced in 1969]] for [[560-series scopes]]. | The '''Tektronix 3A9''' is a differential amplifier plug-in [[introduced in 1969]] for [[560-series scopes]]. | ||
It shares similarities with the [[3A10]] transducer amplifier and the [[7A22]] from the [[7000-series scopes|7000 series]] and [[5A22N]] [[5000-series scopes]]. | It shares similarities with the [[3A10]] transducer amplifier and the [[7A22]] from the [[7000-series scopes|7000 series]] and [[5A22N]] from the [[5000-series scopes]]. | ||
The 3A9 features a variable high-frequency cut-off from 100 Hz to 1 MHz and a variable low-frequency | The 3A9 features a variable high-frequency cut-off from 100 Hz to 1 MHz and a variable low-frequency | ||
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The differential amplifier design is a variant of the [[1A7A]] circuit, also used with modifications | The differential amplifier design is a variant of the [[1A7A]] circuit, also used with modifications | ||
in the [[3A10]], [[7A22]], [[5A22N]] oscilloscope plug ins, and [[5030]]/[[5031]] scopes. The [[AM502]] and the [[26A2]] for the [[2601]] mainframe use BJTs for the offset current sources instead of JFETs. The [[26A2]] adds a common mode signal which is connected to a LEMO probe connector. | in the [[3A10]], [[7A22]], [[5A22N]] oscilloscope plug ins, and [[5030]]/[[5031]] scopes. The [[AM502]] and the [[26A2]] for the [[2601]] mainframe use BJTs for the offset current sources instead of JFETs. The [[26A2]] adds a common mode signal circuit which is connected to a LEMO probe connector. | ||
The 3A9 provides differential high-impedance voltage inputs and an AC current probe input | The 3A9 provides differential high-impedance voltage inputs and an AC current probe input | ||
for use with, for example, the [[P6021]] or [[P6019]]. | for use with, for example, the [[P6021]] or [[P6019]]. | ||
The front-end of the 3A9 starts with a differential pair formed by the two N-channel JFETs in | The front-end of the 3A9 starts with a differential pair formed by the two N-channel JFETs in a [[151-1027-00]], Q133. | ||
==Pictures== | ==Pictures== | ||