I had many people e-mail me wanting to know what

[lamarc]

my 18 inch round mono coil for the TDI and the Minelab GPX 4500 looked like so here it is. Also the inductance is 302 to 315uh, depending on the impurities in the copper wire.

[mikebg]

my 18 inch round mono coil for the TDI and the Minelab GPX 4500 looked like so here it is. Also the inductance is 302 to 315mh, depending on the impurities in the copper wire.

Lamarc please write uH instead mh!

[lamarc]

Sorry about that my fault mh?? (uh!!!)

UH

[Qiaozhi]

He's just being pedantic.
I guess he wants you to use a capital "H" for henries, instead of lowercase.

[lamarc]

Is everyone happy now ( uH )

uH how is that

[mikebg]

INTERNATIONAL RULES

There is international rule for "capitalisation" of unit symbols. They are printed and written in lower-case letters except that
the name of the unit is derived from the name of a person. Then the symbol (or the first letter of the symbol) is an upper-case letter. In the S.I. the upper-case symbols are:
Ampere: mA, not ma
Bell: dB, not db
Coulomb: C. The lower case "c" means centi.
Faraday: pF, not pf (pf means pico-femto :-)
Henry: mH, not mh
Hertz: Hz, not hz. (KHz means kelvin-herz :-)
Joule: J
Kelvin: K. (We should use only lower-case "k" for kilo)
L is the recommended symbol for the liter in the United States. In EU is used simbol dm3 or cu dm
M means mega, "m" means mili.
Newton: N. The lower-case "n" means nano. (NF not means nanofarad. It is newton-farad. :-)
Ohm: the uper-case Greek letter omega, but we prefer "ohm" or R.
Pascal: Pa (pA means picoamperes)
Siemens: mS means milisiemens, not milisecond. The lower case "s" means second.
Tesla: T
"u" is nonstandard letter for micro, but in Germany is preferred yF instead uF :-)
Volta: mV, not mv
Watt: kW. (KW is not kilowatt. It is kelvin-watt :-)
Weber: Wb and for radiation there are units Bq (Becquerel), Gy (Gray) and Sv (Sievert).
IMPORTANT: There is a space between the numerical value and unit symbol in the text documents.
Exceptions are the component values in electronics - compare notations
100 Ohm with 100ohm, 100R and 100Ohm!

[Carl-NC]

It is also acceptable to use 'v' and 'a' for AC and 'V' and 'A' for DC. So an offset might be 10mV while a signal might be 10mv.

[mikebg]

It is also acceptable to use 'v' and 'a' for AC and 'V' and 'A' for DC. So an offset might be 10mV while a signal might be 10mv.

Carl, for what is used notation "signal 10mv";
for amplitude 10mV of sinusoidal signal, 10mV eff (10mV rms) or 10mV p-p (swing or peak to peak as seen in oscilloscope)?

[Aziz]

http://en.wikipedia.org/wiki/Interna...ystem_of_Units

http://physics.nist.gov/cuu/index.html
http://physics.nist.gov/cuu/Units/
http://physics.nist.gov/cuu/Units/rules.html

Aziz

[Qiaozhi]

uH how is that

I bet now you wish you'd learnt to write proper!

But seriously ... it is good to know the rules. I've been guilty of writing KHz, instead of kHz, and not leaving a space between the number and the units. Despicable, I know, but sometimes it happens.

[Krzysztof]

for what is used notation?

I greet all.
10mV is rms officially, unofficially near measurements from osciloscope this 10mV amplitude.
Who would count this seeing on screen.
You pass value peak to peak 10mV pp.
Always how in signals on joint "Euro / Peritel".
Best regards Chris.

[Aziz]

..
"u" is nonstandard letter for micro, but in Germany is preferred yF instead uF :-)
..

not recommended. According to the international rules ( http://physics.nist.gov/cuu/pdf/sp811.pdf , page 7):

yF = yocto F = 1e-24 F

Anyway, we aren't scientists. But it's interesting to know some rules.

Aziz

[kt315]

It is also acceptable to use 'v' and 'a' for AC and 'V' and 'A' for DC. So an offset might be 10mV while a signal might be 10mv.

Carl, we write the uppercase symbol if it is a personal name. I think this is international rule. we study this rule still in a school. as if we esteem/respect these men... they all are GREAT originators. or not? uppercase symbol of one name is like a memorial in his honour (THE MEMORIAL). so if I write mv in place of mV seems then I do not respect the great man Volt.