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

[Tom Miller]

Bert, the normal oscillator is just a crystal. Option 001 is a TCXO, no 
oven. If you do not have opt 001, I would look for the second adjustment 
internally. Two are shown on the schematic.

----- Original Message ----- 
From: "Burt I. Weiner" <b...@att.net>
To: <time-nuts@febo.com>
Sent: Saturday, November 01, 2014 8:39 PM
Subject: [time-nuts] UPDATE: HP 5300B - HP 5308A Counter Time Base...


The closest it will adjust is -2.5 Hz of 10.0000 MHz.  This unit differs 
from the one in the manual in that it has a Microsonics OCXO with the 
adjustment on the side of the module.  The oven does not feel warm but is 
written on the side is: "Adjust at 25 Deg C", which is about 77 degrees F. 
The schematic associated with the oven is missing from the schematic.  I 
suspect that the oven is either shot or not getting power.  The unit will 
not power up with the boards separated so I'm going to have to spend some 
time hanging wires out the side to make measurements.  Does anyone know of 
a schematic showing the Microsonics module and the associated circuitry 
for oven control?  Not sure if it's worth the effort, but it would be a 
shame to toss it - that's against my nature.

Burt, K6OQK



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" <tmiller11...@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.
>
>http://www.keysight.com/main/techSupport.jspx?s
earchT=5300B&id=5300B:epsg:pro&pageMode=OV&pid=5300B:epsg:pro&cc=US&lc=eng
>
>Do you have a frequency reference (house standard) that you can use to
>adjust the reference in the counter? See the manual.
>
>Regards,
>Tom
>
>From: "Burt I. Weiner" <b...@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 <kb...@n1k.org>
>
>Hi
>
>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.
>
>Bob

Burt I. Weiner Associates
Broadcast Technical Services
Glendale, California  U.S.A.
b...@att.net
www.biwa.cc
K6OQK
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