[time-nuts] Question about 5065A 2nd Harmonic Problem

Robert Darlington rdarlington at gmail.com
Mon Aug 31 00:26:05 UTC 2009


A time-nuts wiki page would be pretty cool.   Topics on all sorts of nuttery
with links to manuals and such.

-Bob

On Sun, Aug 30, 2009 at 6:20 PM, Steve Rooke <sar10538 at gmail.com> wrote:

> 2009/8/30 Chuck Harris <cfharris at erols.com>:
> > Hi Stan,
> >
> > It gets like a broken record, but the first place I always go when a
> > formerly working piece of test equipment stops working is the power
> > supply.
> >
> > Check the power supply voltages for both value, and ripple.
> >
> > Then check all of the electrolytic capacitors for ESR.  It only takes
> > one, in a loop somewhere, that has opened up to completely hose the
> > operation.
> >
> > Tantalums are notorious for becoming short circuit... Fortunately, HP
> never
> > really endorsed the epoxy dipped tantalums, like Tektronix did.  However,
> > the
> > milspec axial leaded caps they did use sometimes open circuit.
> >
> > The 5065 is loaded with carbon composition resistors (IIRC).  They are
> noted
> > for drifting out of range... particularly the high value resistors.
> >
> > The very last place to go is any adjustments!
>
> Is there some way we could make up a FAQ and have it available
> somewhere to save having to dig through reams of old group postings?
> This is the area where a web based forum would score or even like the
> monthly usenet postings.
>
> Cheers,
> Steve
>
> > -Chuck Harris
>
> --
> Steve Rooke - ZL3TUV & G8KVD
> A man with one clock knows what time it is;
> A man with two clocks is never quite sure.
>
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