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11A52: Difference between revisions
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==Internals== | ==Internals== | ||
It uses custom Tek chips including the [[155-0076-00]] and [[M377]] amplifier chip. | It uses custom Tek chips including the [[155-0076-00]] (M94 overload detector) and [[M377]] amplifier chip. | ||
In the 11A52, the digital output of the M94 overload detectors (one per channel) | |||
are received by the microprocessor. | |||
If overload is detected, software running in the microprocessor switches the input relay | |||
to remove the signal from the 50 Ω attenuator. | |||
This is in contrast to the [[485]], where the M94 directly controls the input relay. | |||
During the 11A52's self-check, the M94 IC for each channel is tested. | |||
An analog switch injects test currents, positive and negative, | |||
into the summing junction at the input of each M94. | |||
The outputs are checked by the self-check software routine. | |||
==Links== | ==Links== | ||
* [[11A-series plug-in NVRAM replacement]] | * [[11A-series plug-in NVRAM replacement]] | ||