AW: [time-nuts] HP 10811A vs 10811-60111

David Kirkby david.kirkby at
Sat Apr 23 12:38:29 EDT 2005

Thanks for that.

It does seem the specification of the 10811-60111 is poorer than the 
10811A, as the formers time domain stability at 1s is twice as bad 
(10^-11) compared to that of the 10188A (5x10^-12), and just about every 
other parameter is "not specified" on the 10811-60111.

It is particularly annoying when I has some suspicions it was not an 
10811A, so asked the seller

and he confirmed it was, and then said I could have an 10811-60111 if I 
wanted for the same price. I made it clear I did not want it, so he 
sends me it anyway!

I sent him a mail saying:

"I have sent you payment for this. Please ensure it is the HP10811A and 
not the HP10811-60111, which you said in an email you also had"

So he sends me an HP10811-60111 anyway!

Dave Kirkby

Hubert v. Bonhorst wrote:
> Sorry for page flipped. Attached pdf is for 10811-60111
> Best regards
> Hubert
> -----Ursprüngliche Nachricht-----
> Von: time-nuts-bounces at [mailto:time-nuts-bounces at] Im
> Auftrag von David Kirkby
> Gesendet: Samstag, 23. April 2005 16:32
> An: Discussion of precise time and frequency measurement
> Betreff: [time-nuts] HP 10811A vs 10811-60111
> Can anyone tell me the difference between the two above oscillators? I 
> have the manual for the 97page manual (page 2 is upside down), but it 
> does not mention the latter.
> However, I think I have seen a small couple of page document somewhere 
> which listed the 10811-60111 as having no specification for phase noise, 
> and so therefore not an ideal choice for a low phase noise oscillator. 
> One might as well start with something that is specified for a low phase 
> noise.
> I can't however now find the exact spec of the 10811-60111. Can anyone 
> give me it?
> I won an auction for a 10811A on eBay and the seller said I could have a 
> 10811-60111 for the same price if I wanted it too. I said no, I wanted 
> the 10811A, but he has sent me the  10811-60111 instead.
> Is the 10811-60111 inferior? How does it differ from the 10811A?
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Dr. David Kirkby,

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