[time-nuts] Fine print on HP 5334B

[John Miles]

That was with an external 10 MHz source with both rear-panel reference and
front-panel Ch B inputs fed from a passive 4:1 splitter, by the way.
Feeding the EXT reference output directly to Ch B through a 6' cable results
in an average reading much closer to exactly 10 MHz.

-- john, KE5FX

> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com]On
> Behalf Of John Miles
> Sent: Thursday, February 22, 2007 12:30 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] Fine print on HP 5334B
>
>
> What do people observe on their 5370A/Bs?  After warmup, I tend to see a
> bias of about +0.0005 Hz, or 5E-11, when observing its own 10 MHz source.
> There is some occasional random waffling on the order of about
> +/- 0.001 Hz
> but for the most part it reads close to 10.000 000 000 5.
>
> I have never been able to calibrate the interpolators (specifically the
> anticoincidence adjustment) in these counters, due to lack of a
> vernier-adjustable pulse generator.  When I was going through one
> last week,
> I just left the anticoincidence pot in the middle of its range,
> and couldn't
> see any ill effects from doing so.  The manual is not that great at
> describing exactly what this adjustment does.
>
> -- john, KE5FX
>
>