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{{Plugin Sidebar | {{Plugin Sidebar | ||
|manufacturer=Tektronix | |||
summary=1 MHz | |series=560-series scopes | ||
image=3a9 front. | |type=3A9 | ||
caption=Tektronix 3A9 front | |summary=1 MHz differential amplifier plug-in | ||
|image=Tek 3a9 front.jpeg | |||
|caption=Tektronix 3A9 front | |||
introduced=1969 | | |introduced=1969 | ||
discontinued=1974 | | |discontinued=1974 | ||
manuals= | |designers=Val Garuts | ||
* [ | |manuals= | ||
* [[Media:070-0913-00.pdf|Tektronix 3A9 Manual]] (PDF) | |||
* [[Media:Tek 3a9 fcp april 1969.pdf|Tektronix 3A9 Factory Calibration Procedure, April 1969]] | |||
}} | }} | ||
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]] from the [[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 cut-off from DC to 10 kHz. | ||
cut-off from DC to 10 kHz. When DC coupled, the 3A9 provides a variable offset voltage. | When DC coupled, the 3A9 provides a variable offset voltage. The common mode rejection is 100,000:1. | ||
The common mode rejection is 100,000:1. | |||
{{BeginSpecs}} | {{BeginSpecs}} | ||
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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 use with 125-turn probes ([[P6021]] or [[P6019]]). | ||
The front-end of the 3A9 starts with a differential pair formed by the two N-channel JFETs in a [[151-1027-00]], Q133. | The front-end of the 3A9 starts with a differential pair formed by the two N-channel JFETs in a [[151-1027-00]], Q133. | ||
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Tek 3a9 preamp.png|Preamp (front-end) schematic | Tek 3a9 preamp.png|Preamp (front-end) schematic | ||
</gallery> | </gallery> | ||
==Components== | |||
{{Parts|3A9}} | |||
[[Category:560 series plugins]] | [[Category:560 series plugins]] | ||
[[Category:Differential amplifiers]] | [[Category:Differential amplifiers]] |
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