µRuler User Manual - Page 1
Forum section: electronics / general

author: timb
author_rank: Super Contributor
timestamp: November 18, 2013, 09:31:56 am
content: µRuler Legendv1.0ozµmouncemicrometer/micronOunce to Micron conversion table for PCB copper thickness.SMD FOOTPRINTSPOWnew + (old) SMD sizes in mmResistor PowerSize (in mm) of various SMD components plus the general power of resistors in that size.mil-->mm[Conversion Formulas]thousandth of an inchtomillimetersmm to in/mil & vice versaTable of mil to/from mm conversions plus formulas.VINTMASKBARE>3kmvoltsinternal PCB layertop PCB layerwithmasktop PCB layerwithoutmaskat altitudes above 3kmThis table shows minimum PCB trace separation (in mils) for various voltages and locations.milsA/10°A/5°A/1°mR/intrace width10°C above ambient5°C above ambient1°C above ambientmilliohms per inchMaximum current for various trace widths (0.5oz copper) at several temperatures (°C) above ambient.milsA/10°A/5°A/1°mR/intrace width10°C above ambient5°C above ambient1°C above ambientmilliohms per inchMaximum current for various trace widths (1oz copper) at several temperatures (°C) above ambient.mm1°C5°C10°Cvia size1°C above ambient5°C above ambient10°C above ambientMax current for various diameter 1mil thick vias at several temperatures above ambient.SQ PINDIAmmheader sizeequivalent diameter holeCorrect diameter hole needed for corresponding (square) pin size.EIA SMD TANTALUMcapacitor numbercapacitor lettersize in mmSize (in mm) of SMD Tantalum Capacitors.

author: neilrudden
author_rank: Newbie
timestamp: November 18, 2013, 01:25:52 pm
content: POW - is this a general power rating for a resistor in this size?>3km if used at altitude greater than 3km

author: chip273
author_rank: Contributor
timestamp: November 18, 2013, 05:11:53 pm
content: Please remove the red shadow text, it really hurts in the eyes.

author: creyc
author_rank: Regular Contributor
timestamp: November 18, 2013, 07:44:06 pm
content: Quote from: chip273 on November 18, 2013, 05:11:53 pmFixed that for you. And WOW that's painful to read!

author: timb
author_rank: Super Contributor
timestamp: November 18, 2013, 11:21:21 pm
content: Sorry guys, internet went out this morning after it posted. Yes, red text will be removed, that was just for my benefit while editing. I'll get this cleaned up shortly!

author: EEVblog
author_rank: Unknown
timestamp: November 18, 2013, 11:48:43 pm
content: Quote from: neilrudden on November 18, 2013, 01:25:52 pmCorrect on both.

author: timb
author_rank: Super Contributor
timestamp: November 19, 2013, 04:40:09 am
content: Almost done. mR/in is megohms per inch of trace, right?

author: EEVblog
author_rank: Unknown
timestamp: November 19, 2013, 04:42:51 am
content: Quote from: timb on November 19, 2013, 04:40:09 ammilliohms! - small m, not big M

author: timb
author_rank: Super Contributor
timestamp: November 19, 2013, 04:44:43 am
content: Quote from: EEVblog on November 19, 2013, 04:42:51 amDoh!Of course... Fixing that and adding descriptions for the last few tables and I should be done.

author: timb
author_rank: Super Contributor
timestamp: November 19, 2013, 04:54:29 am
content: Okay, initial post is done! Anything need correcting?

author: samgab
author_rank: Frequent Contributor
timestamp: November 19, 2013, 05:35:42 am
content: Quote from: timb on November 19, 2013, 04:54:29 am"Ledgend"... really?

author: timb
author_rank: Super Contributor
timestamp: November 19, 2013, 06:11:39 am
content: Quote from: samgab on November 19, 2013, 05:35:42 amSorry I didn't notice a typo? The spellcheck either didn't catch it or I didn't notice. No need to be sarcastic, it's fixed now.

author: don.r
author_rank: Frequent Contributor
timestamp: December 02, 2013, 04:47:20 am
content: Nice work Tim. Can we have this stickyed?