I'm guessing that the 8566, being the flagship product, used the
deluxe version of the 10811 with RF connectors instead of
the edge card connector usually seen. The
two versions were designed with A and B suffixes originally,
and later with D and E suffixes. (I don't know what happened
to the C suffix). Inside the shielded box, the oscillator itself
is a normal 10811 series.

Rick N6RK

"John Miles" wrote in message
...
In article rKXHc.53423$MB3.51741@attbi_s04,
says...
I was the project manager of the 5334B frequency counter.
It had an option to have a 10811 timebase. The standard
timebase, which I inherited from the 5334A design was
embarassingly bad, barely able to do 10 PPM. Unfortunately,
you cannot retrofit a 10811 to a 5334, because you need an
extra PC board. This board is required to be able to put
the 10811 on its side, because there isn't enough height for
it.


Interesting. Could you shed some light on the timebase used in the
8566B and related analyzers circa 1984? The one I'm looking at doesn't
appear to be the standard 10544 or 10811 unit. I've never run across
one of these before in any other HP instruments. Is it just a
repackaged 10811?

-- jm

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In article ,
says...

"Rick Karlquist N6RK" wrote in
message news:JX%Hc.65061$Oq2.47948@attbi_s52...
:
: Only if they paid for it. Many customers went bankrupt.

Regardless! In a lease purchase, the leasing company has the
option to recover the property. If a bankrupt judgment was made,
it was sold as a tangible asset, no difference. However maybe it
IS an indication the price was too high? (If it bankrupt the
company.)


Somehow, I don't think Agilent's price list is to blame for the telecom
bankruptcy wave. :-P

-- jm

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------------------------------------------------------

On Sun, 11 Jul 2004 00:37:16 GMT, "Rick Karlquist N6RK"
wrote:

The various versions of 10811 have part numbers
of the form 10811-6XXXX. There are a few dozen
varieties. I've never heard of "series 3010" in reference
to 10811's.

Rick N6RK

"hamaddict" wrote in message
news
On Sat, 10 Jul 2004 19:48:39 GMT, "Rick Karlquist N6RK"
wrote:

I was the project manager of the 5334B frequency counter.
It had an option to have a 10811 timebase. The standard
timebase, which I inherited from the 5334A design was
embarassingly bad, barely able to do 10 PPM. Unfortunately,
you cannot retrofit a 10811 to a 5334, because you need an
extra PC board. This board is required to be able to put
the 10811 on its side, because there isn't enough height for
it.

The gray market in used HP/Agilent test equipment is
really hurting Agilent in some products. My old division no
longer exists. I now work at Agilent Labs.

Rick N6RK

project manager for the
"John Walton" wrote in message
...
One of the great things which the telecom bust did was to make the
equipment
you designed at HP available to us experimenters -- I use my HP3586C
Receiver's ovenized oscillator to drive my HP5334 frequency counter


Rick,

The 10811 that I have has a decal on it that reads "upgraded to series
3010". Do you know what that means?

thanks,
Lefty



It's actually a 10811-60111 with a seperate decal thats says 3010...I
was just curious.

thanks,

lefty

The 10811 that I have has a decal on it that reads "upgraded to series
3010". Do you know what that means?

Lefty-

The 10811-60111 that came in my used HP 5334B counter, had a blown thermal
fuse. Upon considerable investigation, I found that it was a common problem
and had been addressed by HP, using fuse with a higher temperature rating. It
is possible that your 3010 refers to the thermal fuse upgrade.

Incidentally, the going price for a used 10811-60111 was around $100 a couple
of years ago. I trusted a guy and ended up with a second unit that also had a
blown thermal fuse!

73, Fred, K4DII

In article ,
says...

It's actually a 10811-60111 with a seperate decal thats says 3010...I

Possibly it refers to a production change that took place in the 10th
week of 1990 (=60 + 30), in HP date code.

-- jm

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Note: My E-mail address has been altered to avoid spam
------------------------------------------------------

"John Miles" wrote in message
...
: In article ,

: says...
:
: "Rick Karlquist N6RK" wrote
in
: message news:JX%Hc.65061$Oq2.47948@attbi_s52...
: :
: : Only if they paid for it. Many customers went bankrupt.
:
: Regardless! In a lease purchase, the leasing company has the
: option to recover the property. If a bankrupt judgment was
made,
: it was sold as a tangible asset, no difference. However
maybe it
: IS an indication the price was too high? (If it bankrupt the
: company.)
:
: Somehow, I don't think Agilent's price list is to blame for the
telecom
: bankruptcy wave. :-P
: -- jm

Yet the same bankrupt companies are somehow responsible for the
financial problems at Agilient? Get real.

AFAIK, the 3010 sticker has nothing to do with the thermal
fuse issue. The thermal fuse was a debacle from the get go.
If your fuse fails, just replace it with a piece of wire. Ovens
very rarely run away. It is far more likely the fuse will fail
or its socket will corrode (can't solder it in because the solder
would melt the fuse). If the oven does run away, the heater
transistors will open up and serve as fuses.

Rick N6RK

"Fred McKenzie" wrote in message
...
The 10811 that I have has a decal on it that reads "upgraded to series
3010". Do you know what that means?

Lefty-

The 10811-60111 that came in my used HP 5334B counter, had a blown thermal
fuse. Upon considerable investigation, I found that it was a common
problem
and had been addressed by HP, using fuse with a higher temperature rating.
It
is possible that your 3010 refers to the thermal fuse upgrade.

Incidentally, the going price for a used 10811-60111 was around $100 a
couple
of years ago. I trusted a guy and ended up with a second unit that also
had a
blown thermal fuse!

73, Fred, K4DII

In article 0ZxIc.58659$JR4.11986@attbi_s54,
says...
AFAIK, the 3010 sticker has nothing to do with the thermal
fuse issue. The thermal fuse was a debacle from the get go.
If your fuse fails, just replace it with a piece of wire. Ovens
very rarely run away. It is far more likely the fuse will fail
or its socket will corrode (can't solder it in because the solder
would melt the fuse). If the oven does run away, the heater
transistors will open up and serve as fuses.


I'd always assumed it was there to avoid heat-damage to the expensive
part (the crystal). Unfortunately, it was mounted far outside the
thermal enclosure for the crystal and its oven, so it's unlikely to
detect any failure condition short of a house fire.

-- jm

------------------------------------------------------
http://www.qsl.net/ke5fx
Note: My E-mail address has been altered to avoid spam
------------------------------------------------------

Ovens
very rarely run away. It is far more likely the fuse will fail
or its socket will corrode (can't solder it in because the solder
would melt the fuse). If the oven does run away, the heater
transistors will open up and serve as fuses

Rick-

I've seen photos of these ovens on E-Bay, that had been stained by smoke coming
out of the adjustment hole. I'd rather have some kind of protection.

I believe the oven uses proportional control, so the transistors' maximum
dissipation would occur when the heating element is half on. In a "runaway"
mode, the transistors would be switched on with maximum current but nearly zero
voltage. Also, one transistor failure mode is a short-circuit.

With regard to John Miles' comment about the thermal fuse being to far from the
oven's heating element to be effective, perhaps that is true. However, the
earlier thermal fuse was rated at 108 degrees C, and it occasionally would open
in an oven that was apparently operating correctly in the range of 80 to 84
degrees C. The newer fuse is rated at 115 degrees C. I suspect the problem is
that it is opening due to a combination of time and temperature, not
temperature alone.

I've been running one of the new parts for about two years without a hitch.
The frequency has not been adjusted since about two years ago, and it still
takes 15 or 20 seconds to drift one Hz against a 10 MHz rubidium oscillator.

That HP 5334B is one nice counter!

73, Fred, K4DII

The crystal will not be damaged by any temperature the oven
is capable of.

Rick N6RK

"John Miles" wrote in message
...

I'd always assumed it was there to avoid heat-damage to the expensive
part (the crystal). Unfortunately, it was mounted far outside the
thermal enclosure for the crystal and its oven, so it's unlikely to
detect any failure condition short of a house fire.

-- jm