3A9: Difference between revisions
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|series=560-series scopes | |series=560-series scopes | ||
|type=3A9 | |type=3A9 | ||
|summary=1 MHz differential amplifier | |summary=1 MHz differential amplifier plug-in | ||
|image=3a9 front. | |image=Tek 3a9 front.jpeg | ||
|caption=Tektronix 3A9 front | |caption=Tektronix 3A9 front | ||
|introduced=1969 | |introduced=1969 | ||
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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]] |
Latest revision as of 07:16, 28 November 2023
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 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 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.
Key Specifications
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 |
---|---|
Deflection | 10 μV/Div to 10 V/Div in 1–2–5 sequence |
Input impedance | 1 MΩ // 47 pF (either input) |
Signal ranges |
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
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Preamp (front-end) schematic
Components
Some Parts Used in the 3A9
Part | Part Number(s) | Class | Description | Used in |
---|---|---|---|---|
151-0261-00 | 151-0261-00 | Discrete component | dual PNP transistor | AM501 • AM502 • CG5001 • CG551AP • FG501 • FG502 • FG503 • OF150 • OF151 • OF152 • OF235 • OS261 • RM502A • R1140 • R5030 • R5031 • R7912 • 067-0679-00 • 067-0807-00 • 1101 • 1140A • 1141 • 1142 • 1350 • 145 • 1450 • 1480 • 1481 • 1482 • 1485 • 1501 • 1801 • 1900 • 1910 • 1980 • 213 • 26A1 • 26A2 • 2620 • 285 • 3A9 • 3A10 • 3S1 • 3S2 • 3S5 • 3S6 • 432 • 434 • 4501 • 454 • 4601 • 4602 • 4610 • 4612 • 4620 • 4632 • 4634 • 4701 • 475 • 492 • 492A • 492AP • 494 • 494P • 496 • 496P • 5A13N • 5A20N • 5A21N • 5A22N • 5A26 • 5L4N • 502A • 5030 • 5031 • 576 • 690SR • 7A22 • 7A29 • 7B51 • 7B71 • 7J20 • 7L5 • 7S11 • 7S12 • 7912AD |
151-1027-00 | 151-1027-00 | Discrete component | dual N-channel JFET | 5031 • 3A9 • AM502 |