confusing capacitor value

wim · 23rd February 2005, 05:34 PM

I am a little confused by the value that i read on a capacitor. It says: 12500 MFD.

Well is MFD the same as micro farad (uF) or mili farad? I know that such a things are in the USA not always the same as in Europe.

By the way, i am talking about a Mallory CG1252U75G1

Tekko · 23rd February 2005, 05:51 PM

It´s 12500µF

wim · 23rd February 2005, 08:04 PM

Thanks a lot

klitgt · 24th February 2005, 10:34 AM

Quote:

Originally posted by wim
I am a little confused by the value that i read on a capacitor. It says: 12500 MFD.

Well is MFD the same as micro farad (uF) or mili farad? I know that such a things are in the USA not always the same as in Europe.

By the way, i am talking about a Mallory CG1252U75G1

If it was millifarad they would be 1000 times bigger, both as to value, but more importantly by physical size !

AndrewT · 25th February 2005, 07:25 AM

Hi,
m = milli, M = mega
12,500 megaFarad, wow thats big.
The CAT tried to roll it into the garage but it would not fit through the door opening.
You think the manufacturers could at least try to get their labelling right.

Jonathan Bright · 25th February 2005, 07:56 AM

Hi Andrew. I'm not sure of two things. (a) Just how much you are joking and (b) whether you are actually right about the use of "m" and "M" in the way you have just indicated. Is that an accepted convention? I've functioned for several decades on the basis the "u"(well the Greek "u" actually) "m" or "M" were pretty much interchangeable in this pariticular context and haven't got into serious trouble yet. Or am I just being humourless? (if that's the case I've got problems that this forum won't fix)

AndrewT · 25th February 2005, 09:02 AM

Hi,
I am part joking but also on my hobby horse re correct nomenclature.
In the metric system all the capital letters are reserved for multipliers greater than 1000 and all the lower case for multipliers less than or equal to (<=) one. ie. k =*1000 m=/1000 etc.

jacco vermeulen · 25th February 2005, 09:14 AM

Quote:

Originally posted by wim
By the way, i am talking about a Mallory CG1252U75G1

CG1252U75G1 stands for Computer Grade 125 with 2 zeros uF at 75 Volts.
What is confusing about that ?
If its a special computer grade the letters are CGS.

Mallory code even gives you production shift numbers, production date, and capacitor size !

m and M are not just metric symbols.
They are part of the International Standardisation units(SI) !

Sorry Jonathan.

shusha · 28th February 2005, 02:43 PM

Talking about capacitors, I have never seen any manufacturer express capacity in milifarads.

As jacco said Mallory always mark their caps with MFD (micro). I thing Sprague is doing the same.

I preffer using uF and most European shematics and caps are marked with an u.

sam9 · 28th February 2005, 03:15 PM

If you can lift it without back strain, it's not "milli-" . If you can lift it without a forklift, it's not "Mega-".

An overstatement of course, but you get the idea. And yes, the interchangability of "mu", u, m and M in this context is annoying. Like I don't have enough problems already nomenclature that may or may not omit nano on the way to pico.

23rd February 2005, 05:34 PM	#1
wim diyAudio Member Join Date: Sep 2003 Location: Nootdorp, Netherlands	confusing capacitor value I am a little confused by the value that i read on a capacitor. It says: 12500 MFD. Well is MFD the same as micro farad (uF) or mili farad? I know that such a things are in the USA not always the same as in Europe. By the way, i am talking about a Mallory CG1252U75G1 __________________ Als er "X" artikelen benodigd zijn, blijken er "X" - 1 in voorraad te zijn.

23rd February 2005, 08:04 PM	#3
wim diyAudio Member Join Date: Sep 2003 Location: Nootdorp, Netherlands	Thanks a lot __________________ Als er "X" artikelen benodigd zijn, blijken er "X" - 1 in voorraad te zijn.

25th February 2005, 07:25 AM	#5
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, m = milli, M = mega 12,500 megaFarad, wow thats big. The CAT tried to roll it into the garage but it would not fit through the door opening. You think the manufacturers could at least try to get their labelling right. __________________ regards Andrew T.

25th February 2005, 07:56 AM	#6
Jonathan Bright diyAudio Member Join Date: Feb 2004 Location: Queensland	Hi Andrew. I'm not sure of two things. (a) Just how much you are joking and (b) whether you are actually right about the use of "m" and "M" in the way you have just indicated. Is that an accepted convention? I've functioned for several decades on the basis the "u"(well the Greek "u" actually) "m" or "M" were pretty much interchangeable in this pariticular context and haven't got into serious trouble yet. Or am I just being humourless? (if that's the case I've got problems that this forum won't fix) __________________ "It was the Spring time of the year when aunt calls to aunt like mastodons across the frozen waste." P.G. Wodehouse.

25th February 2005, 09:02 AM	#7
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, I am part joking but also on my hobby horse re correct nomenclature. In the metric system all the capital letters are reserved for multipliers greater than 1000 and all the lower case for multipliers less than or equal to (<=) one. ie. k =*1000 m=/1000 etc. __________________ regards Andrew T.


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23rd February 2005, 05:51 PM	#2
Tekko diyAudio Member Join Date: Jan 2005	It´s 12500µF

28th February 2005, 02:43 PM	#9
shusha diyAudio Member Join Date: Sep 2004 Location: Velika Gorica	Talking about capacitors, I have never seen any manufacturer express capacity in milifarads. As jacco said Mallory always mark their caps with MFD (micro). I thing Sprague is doing the same. I preffer using uF and most European shematics and caps are marked with an u.

28th February 2005, 03:15 PM	#10
sam9 diyAudio Member Join Date: Jun 2002 Location: Left Coast	If you can lift it without back strain, it's not "milli-" . If you can lift it without a forklift, it's not "Mega-". An overstatement of course, but you get the idea. And yes, the interchangability of "mu", u, m and M in this context is annoying. Like I don't have enough problems already nomenclature that may or may not omit nano on the way to pico.

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