Round-pin mains leads (old HP, etc)

21 Aug 2009

...

  > One of the problems is there are several
variations that look very similar:
 > slightly different pin diameters, pin lengths, spacing, and there are
 > two that
 > look physically identical but have the hot/neutral swapped. With that said,  
 Yeah.  I found THAT out the hard way when I was much younger.
 But, not to worry!, Tony is probably the only one here who connects his
 power cords to a meter before he connects them to their intended target! 
Err, of course I do (and I am not being sarcastic). I also 'megger' them 
(does that make senze across the Pond? A 'Megger' over here is a 
megohmeter that uses a high test voltage (perhaps 1000V) to detect 
insualtion breakdown). 

The polarity matters for the HP9125A in that it has single-pole fusing 
(in the 'hot'/live/phase lead) and also single-pole switching (a relay 
operated by the calculator supply) in the same wire. 

My guess is that if I can find this cable, it'll either have nothing on 
the other emd, or a US 115V/15A plug. Which I would cut off and replace 
with a UK mains plug (the 9125A has a voltage selector for 115V/230V 
mains). In whcih case I can get the polarity right.

-tony

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

2011

2010

2009

2008

2007

2006

2005

2004

2003

2002

2001

2000

1999

1998

1997

Round-pin mains leads (old HP, etc)