Re: Idle Question About the 485


Ozan
 

Hi Walter,

On Thu, Oct 21, 2021 at 09:14 AM, walter shawlee wrote:
50 ohm protection on the 485 is a fusible ceramic element in the attenuator
chain, a rare and hard to find object.
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485 has an active protection circuit that flips input relay to 1M-ohm setting to protect the 50-ohm attenuator. There could be a fusible element as well although I can't see it in the schematic or the pictures I took on my unit. Perhaps it was on certain serial number range.

Ozan

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