[time-nuts] AC Connector On HP 5061B

wje wje at quackers.net
Thu Oct 2 18:09:21 EDT 2008


   And this is another reason you should pay attention to hot and neutral.
   The hot side is usually where the fuse is, as is the case in the 5061.
   If you swap them, you no longer have any protection against an internal
   hot-to-ground AC fault.
Bill Ezell
----------
They said 'Windows or better'
so I used Linux.

   Ian Sheffield wrote:

Similar to what another poster suggested, but more direct -
assuming the schematic shows that only the live side is fuse protected
inside the HP, then if you take out the fuse
on the rear panel, and see which prong on the connector connects to it, that
should tell you.

 - unless both sides are fused :-(

Ian.

----- Original Message -----
From: "Jeffrey Okamitsu" [1]<w3kl at w3kl.com>
To: "Discussion of precise time and frequency measurement"
[2]<time-nuts at febo.com>
Sent: Thursday, October 02, 2008 7:56 PM
Subject: Re: [time-nuts] AC Connector On HP 5061B


"What happens to a 5061 if I swap the power wires? I can imagine some second
order considerations that would depend on how the power transformer is
constructed."

This is my concern. Hence, I want to get it right in the beginning.

Jeff


Jeffrey K. Okamitsu, PhD, MBA
+1-609-638-5402

--- On Thu, 10/2/08, Hal Murray [3]<hmurray at megapathdsl.net> wrote:

From: Hal Murray [4]<hmurray at megapathdsl.net>
Subject: Re: [time-nuts] AC Connector On HP 5061B
To: "Discussion of precise time and frequency measurement"
[5]<time-nuts at febo.com>
Date: Thursday, October 2, 2008, 1:56 PM


US is similar regarding the lashing together of earth and ground for
single phase power. However, current US electric code is very specific
about which terminal of the AC plug is wired to "hot" and which

is

wired to "neutral".

It used to matter back in the tube days when cheap radios/TVs didn't have a

power transformer.  The neutral was connected to the chassis and the B+ was
derived from the hot line.  That gives you a hot chassis if you swap the
power wires.  (The chassis was all hidden in plastic, at least in theory.)


What happens to a 5061 if I swap the power wires?  I can imagine some second
order considerations that would depend on how the power transformer is
constructed.

References

   1. mailto:w3kl at w3kl.com
   2. mailto:time-nuts at febo.com
   3. mailto:hmurray at megapathdsl.net
   4. mailto:hmurray at megapathdsl.net
   5. mailto:time-nuts at febo.com


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