Is there a standard definition of the pictured ground symbol? It is distinct from an unmodified (without the rectangular box) symbol used in the same schematic.
Origin is USA, probably at least 10-20 years old, aerospace.
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asked Jan 16, 2017 at 20:31
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\$\begingroup\$ @hypfco Sorry, no, that's quite impossible. I do have a guess as to the meaning. \$\endgroup\$– Spehro 'speff' PefhanyCommented Jan 16, 2017 at 20:56
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\$\begingroup\$ Never seen that one...what was your guess as to its meaning? \$\endgroup\$– TonyMCommented Jan 16, 2017 at 23:04
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\$\begingroup\$ @TonyM Internal shield. \$\endgroup\$– Spehro 'speff' PefhanyCommented Jan 16, 2017 at 23:08
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\$\begingroup\$ This could be used to denote dedicated EMI chassis connection. I sometimes draw my circuit-sketches (for presentations/reports) using a thicker horizontal bar to visually stress the significance of that bonding point \$\endgroup\$– user16222Commented Aug 26, 2019 at 15:38
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\$\begingroup\$ I have seen that symbol, but I can't remember the application. My guess is it implies a conducting enclosure like the skin of an aircraft or a cable shield or Faraday cage. Is there anything in the schematic that might give a clue? \$\endgroup\$– user319836Commented Oct 2, 2022 at 6:14
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