Brooke Clarke wrote:

The 4050 has the degaussing coil built in.  I would think that the 4060
would too.  All you have to do is connect a variac to the degaussing terminals,
and slowly ramp the voltage up to the specified value, and then slowly ramp
it back down to zero.

I think Hubert has the right idea.  If your tube is magnetized, the magnetization
will slowly get smaller and smaller until it reaches some minimum value.  While
it is doing this, you will see a drift that changes rate.

-Chuck

Hi Chuck:

I have one of the many FTS4060/S24 units being sold on
http://www.governmentliquidation.com.  As far as I can tell these are
stripped of every possible thing that could reduce the price and so I'm
sure there's no built in degaussing capability.

But I'm willing to wait out the problem if that's what it is.

Thanks,

Brooke Clarke, N6GCE

--
w/Java http://www.PRC68.com
w/o Java http://www.pacificsites.com/~brooke/PRC68COM.shtml
http://www.precisionclock.com

Chuck Harris wrote:

Hi Brooke,

Well, the degausing can even be done using the coil that is used to set
the offset.  So, I wouldn't be so sure that you don't have a degaussing
coil built in.

-Chuck

Brooke Clarke wrote:

Hi Chuck:

OK.  I can set the 3 thumb wheel switches to 999, wait some, then to 000
wait some, then to 900 , 100, etc. etc.
How many steps is reasonable and how long to wait?

Thanks for that idea.

Brooke

Chuck Harris wrote:

--
w/Java http://www.PRC68.com
w/o Java http://www.pacificsites.com/~brooke/PRC68COM.shtml
http://www.precisionclock.com

Chuck,

I have two 4060's, one like Brooke's and one regular production. Neither
have degaussing connections inside or out and none of my 4060 manuals
mention degaussing. My HP 5061's certainly have degaussing provisions.

Take care,
Had, K7MLR

At 06:11 PM 4/20/2005, you wrote:

No, that isn't quite it!  You disconnect the offset magnetic
coil, and connect it to a variac with a series light bulb to limit
the current.  I cannot tell you what size bulb to use, or how much voltage,
as I would have to make some educated guesses.  Make the wrong guess,
and B/O is possible.

I read about the technique somewhere, I just don't recall where.

-Chuck

Brooke Clarke wrote:

Hi Chuck:

If I had a schematic I'd give it a go, but without it, I'm not
comfortable powering random wires.

So it's back to waiting.

Have Fun,

Brooke

Chuck Harris wrote:

--
w/Java http://www.PRC68.com
w/o Java http://www.pacificsites.com/~brooke/PRC68COM.shtml
http://www.precisionclock.com

At the risk of misleading Brooke down the wrong path....

For what it's worth, my copy of the HP-5060 manual talks about
using the LF coil to test for a possibly magnetized cesium tube.
The injected audio test signal is swept from 50Hz to 5kHz. Any
sharp peaking in beam current above 2500Hz indicates possible
magnetization.

I have no knowledge if the FTS tubes have an LF coil.

-Brian, WA1ZMS

-----Original Message-----
From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com]On
Behalf Of Chuck Harris
Sent: Wednesday, April 20, 2005 9:32 PM
To: Discussion of precise time and frequency measurement
Subject: Re: AW: [time-nuts] Cesium DOES Drift, not

No, that isn't quite it!  You disconnect the offset magnetic
coil, and connect it to a variac with a series light bulb to limit
the current.  I cannot tell you what size bulb to use, or how much voltage,
as I would have to make some educated guesses.  Make the wrong guess,
and B/O is possible.

I read about the technique somewhere, I just don't recall where.

-Chuck

Brooke Clarke wrote:

time-nuts mailing list
time-nuts@febo.com
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts

I imagine that that is because HP just went on the warpath, and declared
all copies of their manuals verboten.  I just got several notices from
ebay telling me about how some HP manuals on CDs that I bought were infringements
on HP's intellectual property.  This was old stuff too, from the early '70s

-Chuck

Bill Janssen wrote: