11A71: Difference between revisions

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192 bytes added ,  17 July 2018
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However, the 7A29 has a VARIABLE gain control
However, the 7A29 has a VARIABLE gain control
while the 11A71 does not.
while the 11A71 does not.
The 11A71 only the 1-2-5 gain sequence.
 
The 7A29 and 11A71 have the same Gilbert cell at the front end, but in the 11A71 it is only used for automatic calibration, not for fine gain control.
The 11A71 has only the 1-2-5 gain sequence.
This is a feature regression, but it avoids an issue that the 7A29 has:
The 7A29 and 11A71 have virtually the same analog circuitry including a Gilbert multiplier at the front end,
the bandwidth of the 7A29 varies depending on the setting of the VARIABLE gain.
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: the bandwidth of the 7A29 changes substantially with the setting of the front panel VARIABLE VOLTS/DIV control.
 
After calibration, there is a small imbalance in the 10mV/div setting, about 0.05 div.
This is a design flaw.
 


{{BeginSpecs}}
{{BeginSpecs}}

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