[time-nuts] HP 5345A

Bill Jones, K8CU k8cu at realhamradio.com
Fri Dec 29 20:10:48 UTC 2006


The HP 5328A that I have uses the EFC as a fine manual adjust. There is an
accessory card that accepts the oscillator and the supporting fine
manual-adjust circuitry is located there.

Bill, K8CU

----- Original Message ----- 
From: "Rick Karlquist" <richard at karlquist.com>
To: "Discussion of precise time and frequency measurement"
<time-nuts at febo.com>
Cc: <time-nuts at febo.com>
Sent: Friday, December 29, 2006 8:04 PM
Subject: Re: [time-nuts] HP 5345A


> Colin Bradley wrote:
> > I just picked up a 5345A from eBay. This unit has a 10811 oscillator
> > instead of the 10544 depicted in the manuals I have. The serial number
has
> > been removed. Does anyone know if there is an EFC adjustment for this
> > counter or is the course control the only way of setting frequency?
> > Colin
>
> I don't know of any instrument in the history of HP/Agilent that ever
> used the EFC as a fine manual frequency adjustment.  The EFC
> was only ever used as a phase locking interface.  The tuning adjustment
> is adequate for annual calibration purposes (IE, you can set it
> within 1 Hz, or 1E-7 if you are careful, and the expected annual
> aging is in that ballpark).
>
> Rick Karlquist N6RK
>
>
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