How to add the Ohm symbol to your schematic.

[jamiechi]

This should apply to all versions of Altium since Summer 09.
This also assumes you are using Win7, Vista, or WinXP. It should also work in Win8. (I don't remember where the program is in WinXP.)
1.) Open the Character Map application. In Win7 just type it in the search box on the start menu.
2.) In Character Map, in the Font selection go to Times New Roman.
3.) Scroll down until you find the Omega symbol and select it in the main window of Character Map.
4.) Press Select, then press the Copy button. (The symbol should be in the edit box.
5.) Go to the schematic editor and edit one of your resistor symbols. Paste the Omega symbol into the Value edit box after the other stuff, such as 1K?.

I saw the old post about this, but I thought it would be better to create a new thread. I was not sure about the policies concerning bumping old threads.

[IanB]

I think it shouldn't be necessary to show the unit of measure next to the value since the symbol should make it clear what the value refers to. (For example, engineering drawings may say "all values in mm" and then just show the numbers on the diagram.)

So for a resistor value of 1 kilohm you would just designate the value as 1k0 on the diagram. Similarly for a 2.2 nF capacitor you would show the value as 2n2.

[sacherjj]

I have gotten used to Alt+codes for some common, like Alt+0181 for µ and Alt+234 for ?.  These seem to work in Altium fine.  Although I generally use the 'R' and leave off Ohm.

1.2 ? -> 1R2
1.2 K? -> 1K2
1.2 M? -> 1M2

u along with n and p tend to work fine when you don't want to bother with µ.

Edit: Interesting.  The forum software is converting the omega symbol to ?.  Those should read as the omega symbol.   

[Monkeh]

I have gotten used to Alt+codes for some common, like Alt+0181 for µ and Alt+234 for ?.  These seem to work in Altium fine.  Although I generally use the 'R' and leave off Ohm.

1.2 ? -> 1R2
1.2 K? -> 1K2
1.2 M? -> 1M2

u along with n and p tend to work fine when you don't want to bother with µ.

Edit: Interesting.  The forum software is converting the omega symbol to ?.  Those should read as the omega symbol.   

Yay, character encodings.

Also yay, unpredictable Windows, alt+234 produces Û.

[IanB]

Edit: Interesting.  The forum software is converting the omega symbol to ?.  Those should read as the omega symbol.   

Unfortunately, it does that. The encoding of the character is lost somewhere along the line.

[Monkeh]

Edit: Interesting.  The forum software is converting the omega symbol to ?.  Those should read as the omega symbol.   

Unfortunately, it does that. The encoding of the character is lost somewhere along the line.

Character encoding, unfortunately, is something most people never seem to quite understand.

[Neilm]

In Word, I seem to recall typing 03a9 then pressing ALT-X will produce the ohms symbol.

[Monkeh]

In Word, I seem to recall typing 03a9 then pressing ALT-X will produce the ohms symbol.

U+03A9 being the code point for an uppercase Greek Omega.

[free_electron]

DO NOT USE THE OHM SYMBOL !!!!!
DO NOT USE DOTS OR COMMAS FOR FRACTIONAL VALUES !!!


it is too easy to mistake it for a 0 , especially when printed small.

10R  10 Ohm
1R5  1.5 Ohm
1K5 1.5KiloOhm
1M5 1.5 MegaOhm
0R22 0.22 Ohm

[jamiechi]

I don't use it for component parts, but sometimes it is nice to show the omega in documentation notes on the schematic. I just showed how to do it because someone else asked for it in another thread. I agree, especially on the pcb silk screen, it is not a good idea to use it for parts values. I was sure it looked like an omega symbol in the preview box.
I never use the alt+ any more. There are too many applications in Windows that use different character sets.

[sacherjj]

I have gotten used to Alt+codes for some common, like Alt+0181 for µ and Alt+234 for ?.  These seem to work in Altium fine.  Although I generally use the 'R' and leave off Ohm.

1.2 ? -> 1R2
1.2 K? -> 1K2
1.2 M? -> 1M2

u along with n and p tend to work fine when you don't want to bother with µ.

Edit: Interesting.  The forum software is converting the omega symbol to ?.  Those should read as the omega symbol.   

Yay, character encodings.

Also yay, unpredictable Windows, alt+234 produces Û.

Nice.  Sigh.  I'll probably never pack in the Unicode shortcuts...  To little space left in my brain.