2017

Summer Holiday

Works Closed

31st July-11th Aug

Printed circuit board Manufacturer, Photoplotting Established 1964  All types of Pcb, surface mount sm, PTH, SS single     single sided, PTH, IMS, ML multi layer printed circuit board  prototypes. Cheap high quality PCBs Printed circuit boards. 

Printed circuit boards tooled up from Gerber,JPG,DXF,and most common file types, or camera ready artworks either 2:1 or 1:1 std scale.

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P & M'S  Track Current & Resistance Calculator.

 

Please feel free to download our Track Current & Resistance Spreadsheet Calculator. It was written using Microsoft Excel. Regretfully like most things, although we believe the spreadsheet to be accurate you must accept any liability resulting from its use.

No derating factor has been included in the calculations. It is a good idea to down rate the results by 30% for large tracks rising to 50% or more for small tracks.  

We have performed rough checks on the heating effect at currents up to 100amps. It is not easy to measure temperature rise, but the results were close to our expectations from the spreadsheet calculations.

 

6k Zipped File

46k xls file

 Download 

Download

 

The Spreadsheet is also available online.

 Internet Explorer 4 or later and Microsoft office 2000 or later plugins are req.

 

 online spreadsheet Technical Main

 

 
                          

Copyright 2016 P. & M. Services (Rochdale) Ltd

 Rev  28 July 2017

 Registered No 0853754 (England).