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11A71: Difference between revisions
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{{Plugin Sidebar | {{Plugin Sidebar | ||
|manufacturer=Tektronix | |||
summary=Single channel 1 GHz amplifier | | |series=11000-series scopes | ||
image=11a71-ext.jpg | | |type=11A71 | ||
caption=Tek 11A71 | |summary=Single channel 1 GHz amplifier | ||
|image=11a71-ext.jpg | |||
introduced=1987 | | |caption=Tek 11A71 | ||
discontinued=(?) | | |introduced=1987 | ||
manuals= | |discontinued=(?) | ||
* [ | |designers= | ||
|manuals= | |||
* [[Media:070-6288-01.pdf|Tektronix 11A71 User Reference]] | |||
* [[Media:070-6787-01.pdf|Tektronix 11A71 Service Manual -01]] | |||
* [[Media:070-6787-00.pdf|Tektronix 11A71 Service Manual -00]] | |||
* [[Media:070-7392-99.pdf|Tektronix 11A71 Extended Service Manual]] | |||
* [[Media:Tek 11A71 schematics.pdf|Tektronix 11A71 Schematics]] | * [[Media:Tek 11A71 schematics.pdf|Tektronix 11A71 Schematics]] | ||
* [[Media:Tektronix 11k plugin NVRAM replacement.pdf|Tektronix 11k Plug-in NVRAM Replacement]] | |||
}} | }} | ||
The '''Tektronix 11A71''' a single-channel 1 GHz amplifier for 11000-series scopes. | The '''Tektronix 11A71''' a single-channel 1 GHz amplifier for 11000-series scopes. | ||
The 11A71 is derived from the [[7A29]]. | The 11A71 is derived from the [[7A29]]. However, the 7A29 has a VARIABLE gain control while the 11A71 does not, it has only the 1−2−5 gain sequence. | ||
However, the 7A29 has a VARIABLE gain control | |||
while the 11A71 does not. | |||
The 7A29 and 11A71 have virtually the same analog circuitry including a [[Patent US 3689752A|Gilbert multiplier]] at the front end, but in the 11A71 it is only used for automatic calibration, not for fine gain control. | |||
The 7A29 and 11A71 have virtually the same analog circuitry including a Gilbert multiplier at the front end, | This is feature regression, but it avoids an issue that the 7A29 has, namely that its bandwidth changes substantially with the setting of the front panel VARIABLE VOLTS/DIV control. | ||
but in the 11A71 it is only used for automatic calibration, not for fine gain control. | |||
This is feature regression, but it avoids an issue that the 7A29 has | |||
After calibration, there is a small imbalance in the | After calibration, there is a small imbalance in the 10 mV/div setting, about 0.05 div. | ||
This is a design flaw. | This is a design flaw. | ||
{{BeginSpecs}} | {{BeginSpecs}} | ||
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{{Spec | Input impedance | 50 Ω via a [[Tekprobe BNC connector]] on the front on the plug-in}} | {{Spec | Input impedance | 50 Ω via a [[Tekprobe BNC connector]] on the front on the plug-in}} | ||
{{Spec | Features | | {{Spec | Features | | ||
*Input 5 V<sub>RMS</sub> overload protected with manual reset | * Input 5 V<sub>RMS</sub> overload protected with manual reset | ||
}} | }} | ||
{{EndSpecs}} | {{EndSpecs}} | ||
==Links== | ==Links== | ||
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11a71-amp.jpg | Amplifier section. Blue cable from input attenuator connects to the [[155-0180-00|155-0180-00 input protection circuit]]. Signal is differential from after the first amplifier up to the AD converter in the mainframe. | 11a71-amp.jpg | Amplifier section. Blue cable from input attenuator connects to the [[155-0180-00|155-0180-00 input protection circuit]]. Signal is differential from after the first amplifier up to the AD converter in the mainframe. | ||
11a71-comp.jpg | Compensation trimmers | 11a71-comp.jpg | Compensation trimmers | ||
11a71-detail.jpg | Close-up of late- | 11a71-detail.jpg | Close-up of late-70s RF design | ||
11a71-digital.jpg | Digital board, 8031 MCU | 11a71-digital.jpg | Digital board, 8031 MCU | ||
11a71-daughter.jpg | Digital daughter board | 11a71-daughter.jpg | Digital daughter board | ||
| Line 63: | Line 61: | ||
Tek 11a71 right internal.jpg|right internal | Tek 11a71 right internal.jpg|right internal | ||
</gallery> | </gallery> | ||
==Components== | |||
{{Parts|11A71}} | |||
[[Category:11000 series plugins]] | [[Category:11000 series plugins]] | ||
[[Category:Tekprobe BNC]] | [[Category:Tekprobe BNC]] | ||