11A32: Difference between revisions

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33 bytes added ,  14 February 2023
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==Internals==
==Internals==
===Analog===
===Analog===
Each input channel has a separate attenuator module containing passive 1 megohm attenuators, a 50 ohm termination resistor, an AC coupling capacitor, a switch selecting the calibrator or signal input, and an [[M474]] buffer amplifier.  In normal operation the calibrator signal to the attenuator is instead connected to ground.
Each input channel has a separate attenuator module, part number [[119-2000-0x]],
containing passive 1 megohm attenuators, a 50 ohm termination resistor, an AC coupling capacitor,  
a switch selecting the calibrator or signal input, and an [[M474]] buffer amplifier.   
In normal operation the calibrator signal to the attenuator is instead connected to ground.


The attenuator module output feeds the + input of the [[M377]] amplifier IC through a (blue) 50 ohm transmission line, one per input channel.  The cable lengths set a standard delay per plugin.
The attenuator module output feeds the + input of the [[M377]] amplifier IC through a (blue) 50 ohm transmission line, one per input channel.  The cable lengths set a standard delay per plugin.

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