How to write the unit g-rms

[CamJPete]

I do vibration analysis and testing, so we use the units of g-rms often. I see all sorts of ways to write this and I want to know once and for all what the right way to write it is. Options:
1. Grms
2. G-rms
3. gRMS
4. g-RMS
5. grms
6. g-rms
7. GRMS
8. G-RMS

I can't find an official source stating how to write it. Does anybody here? Thanks.

 

[rb1957]

i'd go with 3 or 4. a lot of the others look like "grams"

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[CamJPete]

I may have answered my own question. I was writing lbf-RMS and realized that the base unit (g or lbf) should probably just be written as it would be normally. So in my options above, no capital G. Then according to the IEEE recommended unit symbol recommendations: "In general, most abbreviations of technical terms are capitalized, but there are notable exceptions such as ac, dc, and rms." I'm going to go with lowercase rms from now on. The last question is where there should be a dash or no space. grms does look like grams though. Maybe a hyphen in this case. But something like Vrms is pretty straightforward. But lbfrms looks too busy. Okay, after typing all that out, I'm going to settle on a hyphen if the base unit is lowercase, and no hyphen if it is upper case. Thanks.

 

[271828]

I just looked at one of my reports and I went with a comma: g, RMS

My vibration analyzer software puts rms in parentheses: g(rms)

I'd say pick whichever you like best. People often leave it out entirely, so you're ahead of them no matter which you choose. LOL

 

[IRstuff]

I would go with parentheses, since "rms" is in no way a unit, and it makes it harder to misunderstand the notation.

Commas and hyphens often get lost in poorer copies of documents

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