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11A71: Difference between revisions
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The 11A71 is derived from the [[7A29]]. | The 11A71 is derived from the [[7A29]]. | ||
However, the 7A29 has a VARIABLE gain control | However, the 7A29 has a VARIABLE gain control while the 11A71 does not, it has only the 1-2-5 gain sequence. | ||
while the 11A71 does not. | |||
The 7A29 and 11A71 have virtually the same analog circuitry including a Gilbert multiplier at the front end, | The 7A29 and 11A71 have virtually the same analog circuitry including a Gilbert multiplier at the front end, | ||
but in the 11A71 it is only used for automatic calibration, not for fine gain 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 | 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. | ||
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}} | ||