Electronics > Beginners
What does a Block Diagram Symbol "Pi" mean?
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NY2KW:
I thought I knew all of the block diagram symbols but I cannot find any reference that explains a box with the Greek symbol Pi with an arrow thru it. Please help!
thanks
jmelson:
--- Quote from: NY2KW on February 24, 2020, 10:28:22 pm ---I thought I knew all of the block diagram symbols but I cannot find any reference that explains a box with the Greek symbol Pi with an arrow thru it. Please help!
thanks
--- End quote ---
An adjustable Pi section attenuator?
Jon
NY2KW:
Duhh.. feel like an idiot missing the obvious. The block diagram showed the Pi-Arrow box and then 3 plain boxes labelled ATTN (all digitally controlled) before the RF output but on the PCB I found 4 identical HMC307 attenuators... and the datasheet said nothing about them being Pi pads. So I thought I was missing something on the PCB. Now I read the fine print and the 1st HMC307 is controlled in 2 dB steps from 0-30 while the others are wired as all or nothing 0/30 dB. Thanks for the quick reply.
Brumby:
--- Quote from: NY2KW on February 25, 2020, 02:08:43 am ---Duhh.. feel like an idiot missing the obvious.
--- End quote ---
You'll fit right in here...! ;D
CatalinaWOW:
While I think you have nailed the meaning in this context, you will sometimes find an upper case pi being used to indicate a multiplication just as an upper case sigma is used to indicate a sum. Comes from the math use of these characters and I've seen it most frequently in control system diagrams/drawings.
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