[Test-Equipment] HP power cords

[Joseph Orgnero]

I have two of these cords with the matching male connectors. If interested 
contact me off page.
Joe Orgnero VE7LBI
----- Original Message ----- 
From: "Barry" <n4buq at knology.net>
To: <test-equipment at mailman.qth.net>
Sent: Tuesday, April 06, 2010 6:18 AM
Subject: Re: [Test-Equipment] HP power cords


> On Mon 05/04/10 10:02 PM , "Eric Lemmon" wb6fly at verizon.net sent:
>> More info:  I have two HP instruments that use the old-style oval
>> detachablepower cord- a Model 680 chart recorder, and a Model 204B audio
>> oscillator.Both of these instruments have isolated transformer primary 
>> windings
>> thatcan be switch-selected for 120 or 240 VAC.  To the best of my
>> knowledge,this wiring is typical of ALL test equipment made by HP that 
>> has the
>> ovalpower inlet.  It is irrelevant which outside contact of the power 
>> cord
>> ishot and which is neutral.  The only thing that matters is that the
>> centercontact on any mating cord is chassis ground.  Therefore, the Volex
>> cordstocked by Allied Electronics is suitable.
>>
>> I just checked the Allied stock listing, and I see that seven of those
>> cordshave already been snapped up since this thread began.  He who
>> hesitates...
>> 73, Eric Lemmon WB6FLY
>
> I just looked at the schematic for a204C (couldn't find the 204B version). 
> If the B is like the C, then it shouldn't matter.  There is no power 
> switch or fuse in the unit.
>
> In the 608 (and many, many other pieces of equipment), there is a fuse and 
> a power switch and the hot side should go to this side.  Functionally, it 
> doesn't matter, but for safety's sake, it does matter.  When the fuse 
> blows (or you have the power switch off), you don't want the hot side to 
> still be feeding something else inside the unit.
>
> Barry - N4BUQ
>
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