3A9: Difference between revisions

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-The Tektronix 3A9 is a differential amplifier plug-in introduced in 1969 for 560-series scopes.
+{{Plugin Sidebar
-It provides a variable high-frequency cut-off from 100Hz to 1MHz.  It provides
+|manufacturer=Tektronix
-a variable low-frequency cut-off from DC to 10kHz.  In the case where the frequency
+|series=560-series scopes
-response is set to go down to DC, the 3A9 provides a variable offset voltage.  The
+|type=3A9
-A9 provides differential high-impedance voltage inputs and an AC current probe input
+|summary=1 MHz differential amplifier plug-in
-for use with, for example, the [[P6021]] or [[P6019]].
+|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>
-Image:3a9 front.jpg
+a9 front.jpg
-Image:3a9 right.jpg
+a9 right.jpg
-Image:3a9 left3.jpg
+a9 left3.jpg
-Image:3a9 left.jpg
+a9 left.jpg
-Image:3a9 inside bright.jpg
+a9 inside bright.jpg
-Image:3a9 bottom.jpg
+a9 bottom.jpg
+Tek 3a9 preamp.png|Preamp (front-end) schematic
 </gallery>
+==Components==
+{{Parts|3A9}}
+[[Category:560 series plugins]]
+[[Category:Differential amplifiers]]