[time-nuts] HP 5300B - HP 5308A Counter Time Base...

Burt I. Weiner biwa at att.net
Sat Nov 1 17:15:53 EDT 2014

Tom & Bob,

Thanks for the comments and quick reply.  Tom, 
when I originally did a  google search I did not 
see the site that you sent, but from your 
guidance I did find the manual showing the 
frequency adjustment and I'm letting the 
5300B/5308A combination counter heat up.  From a 
cold start it's about 6+ Hz low when compared to 
my house GPS reference - a DATUM 9390-52054.

In a bit I'll give the thing a tweak and it 
should come right in as Bob suggests.  I don't 
know the history of this counter except that the 
fellow that gave it to me has nothing to really 
compare it against nor the experience to question 
its accuracy.  On my unit the oscillator 
adjustment marking is gone, but the hole for the 
adjustment thankfully is still there :>

I'll let you know how it goes - should be a simple tweak.

Thanks Guys,

Burt K6OQK

>From: "Tom Miller" <tmiller11147 at verizon.net>
>Subject: Re: [time-nuts] HP 5300B - HP 5308A Counter Time Base
>Hi Bert,
>The service manual for the 5300B is on the keysight.com site under manuals.
>Do you have a frequency reference (house standard) that you can use to
>adjust the reference in the counter? See the manual.
>From: "Burt I. Weiner" <biwa at att.net>
> >I was recently given a HP-5300B / 5308A counter. I thought it might be
> >handy when I'm at an AM broadcast transmitter and need to make "rough"
> >frequency measurements.  It turns out that at 1000 kHz it reads about 4.5
> >Hz high. Looking inside I'm not sure if there's a time base adjustment.  I
> >looked at the on-line manuals available and I don't find any reference to
> >adjusting the time base frequency.  Does anyone here know anything about
> >these counters?  Is there a schematic available?  I'm not looking for
> >precision, but 4.5 Hz at 1 MHz seems a tad much.
> >
> > Burt, K6OQK
> >
>From: Bob Camp <kb8tq at n1k.org>
>4.5 Hz at 1 MHz is 4.5 ppm. That’s not out of 
>the likely adjustment range on the basic crystal 
>reference on a 5308. It’s probably a simple 
>tweak to get it back into calibration.

Burt I. Weiner Associates
Broadcast Technical Services
Glendale, California  U.S.A.
biwa at att.net

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