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The Tektronix 3A9 is a differential amplifier plug-in introduced in 1969 for 560-series scopes. | {{Plugin Sidebar | ||
It | |manufacturer=Tektronix | ||
|series=560-series scopes | |||
|type=3A9 | |||
|summary=1 MHz differential amplifier plug-in | |||
|image=Tek 3a9 front.jpeg | |||
|caption=Tektronix 3A9 front | |||
|introduced=1969 | |||
|discontinued=1974 | |||
|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]]. | |||
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 common mode rejection is 100,000:1. | 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. | ||
When DC coupled, the 3A9 provides a variable offset voltage. The common mode rejection is 100,000:1. | |||
{{BeginSpecs}} | |||
{{Spec | Bandwidth | 1 MHz, LF limit switchable DC, 0.1 Hz to 10 kHz in ×10 steps, HF limit switchable 100 Hz to 1 MHz in ×3/×10 steps}} | |||
{{Spec | Deflection | 10 μV/Div to 10 V/Div in 1–2–5 sequence }} | |||
{{Spec | Input impedance | 1 MΩ // 47 pF (either input) }} | |||
{{Spec | Signal ranges | }} | |||
{| class="wikitable" border=1 style="margin-left: 8em;" | | |||
!Range | |||
! Differential signal | |||
! DC Offset | |||
! Common mode | |||
|- | |||
| 10 μV/Div to 10 mV/Div || ±1 V || ±1 V || ±10 V | |||
|- | |||
| 20 mV/Div to 0.1 V/Div || ±10 V || ±10 V || ±100 V | |||
|- | |||
| 0.2 V/Div to 1 V/Div || ±100 V || ±100 V || ±500 V | |||
|- | |||
| 2 V/Div to 10 V/Div || ±1000 V || ±1000 V || ±500 V | |||
|- | |||
|} | |||
==Internals== | |||
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 circuit which is connected to a LEMO probe connector. | |||
The 3A9 provides differential high-impedance voltage inputs and an AC current probe input | |||
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. | |||
==Pictures== | |||
<gallery> | <gallery> | ||
3a9 front.jpg | |||
3a9 right.jpg | |||
3a9 left3.jpg | |||
3a9 left.jpg | |||
3a9 inside bright.jpg | |||
3a9 bottom.jpg | |||
Tek 3a9 preamp.png|Preamp (front-end) schematic | |||
</gallery> | </gallery> | ||
==Components== | |||
{{Parts|3A9}} | |||
[[Category:560 series plugins]] | |||
[[Category:Differential amplifiers]] |
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