[R-390] HP 8640B Question

[Kim Herron]

The display will come up all zeros when the internal/external switch is set to external.  Most people checking these things out don't have a CLUE how they get used, so they don't realize the switch even exists.  You can also have a counter standard that is not working (internal efect) and the counter won't work in that case either.  It pays to familiarize yourself with this piece (I own two) before you buy one and LOOK at the photos to determine is the thing is set up to work right.

Kim Herron W8ZV
kim.herron at sbcglobal.net
1-616-677-3706

--- On Sat, 2/20/10, Cecil Acuff <chacuff at cableone.net> wrote:


From: Cecil Acuff <chacuff at cableone.net>
Subject: Re: [R-390] HP 8640B Question
To: "Barry" <n4buq at knology.net>, r-390 at mailman.qth.net, "2002tii" <bmw2002tii at nerdshack.com>
Date: Saturday, February 20, 2010, 12:38 PM


Nope...

The display should show the current frequency being generated.....if it's 
all zero's I would say there is a problem.  Mine comes up cold on whatever 
frequency I left it on plus or minus the warm-up drift.  If the lock button 
is depressed it will go straight to a flashing display indicating it is out 
of lock which is common while warming up.  Even then it's not all zeros.

Cecil
----- Original Message ----- 
From: "Barry" <n4buq at knology.net>
To: <r-390 at mailman.qth.net>; "2002tii" <bmw2002tii at nerdshack.com>
Sent: Saturday, February 20, 2010 10:46 AM
Subject: Re: [R-390] HP 8640B Question


> I'm curious about something.  Many of the 8640Bs I see display all zeros -
> apparently on start-up.  Some of the ads state the display simply shows 
> all
> zeros - apparently even when the frequency change knob is exercised.  Is
> this a common?  Is there something one has to do to get the frequency to
> display?
>
> Thanks!
> Barry - N4BUQ
>
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