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11A32: Difference between revisions
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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 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. | ||