[time-nuts] Lab upgrade

[DaveH]

And I have seen them without scorch marks - the tatalums are especially
prone to failing with a dead short.

Use an ohmeter to confirm that the 10V is shorted to ground and then use a
soldering iron and lift one leg of the cap until you find it (them all).

20-30 years is about the magic number.  I am also into electronic music and
lots of people just go ahead and re-cap an instrument if it is that old -
cuts the hassle-factor by several orders of magnitude.

Dave 

> -----Original Message-----
> From: time-nuts [mailto:time-nuts-bounces at febo.com] On Behalf 
> Of Bob Camp
> Sent: Sunday, July 26, 2015 14:07
> To: jason at ball.net; Discussion of precise time and frequency 
> measurement
> Subject: Re: [time-nuts] Lab upgrade
> 
> Hi
> 
> Look for electrolytic / tantalum  capacitors on the 10V rail 
> with scorch marks..
> 
> Bob
> 
> > On Jul 26, 2015, at 12:59 AM, Jason Ball <jason at ball.net> wrote:
> > 
> > Ok - not so bad.
> > 
> > One of the 250v 5Amp inside the case blew on the 10v line.  
>  Now to work
> > out why...
> > 
> > J.
> > 
> > 
> > On Sun, Jul 26, 2015 at 1:05 PM, Jason Ball <jason at ball.net> wrote:
> > 
> >> 
> >> Recently I've been on the hunt for test gear so facilitate 
> moving up into
> >> the microwave bands (ham radio), accurate timing being one 
> of the basics to
> >> be sorted.   As part of this I've recently acquired a HP 
> 5335A with OCXO
> >> and HP5350B microwave frequency counter, both picked up today.
> >> 
> >> I've setup a test stack using a stanford research function 
> generator and
> >> my existing HP 5384A counter to compare all the kit, it 
> was nice to see
> >> everything lock in within +5Hz @ 10MHz using only the 
> internal reference.
> >> I'll have a GPSDO running in a couple of days to provide 
> an external
> >> reference as well.
> >> 
> >> Unfortunately after running for 15 minutes the HP 5335A 
> literally went
> >> 'clunk' and now has no display which is disappointing as I 
> wanted some of
> >> the measurement functions this unit provides.   There's no 
> odd small (for
> >> an old system) so I'm hoping its a reasonably simple 
> problem, I'll open the
> >> case tonight.
> >> 
> >> Does anybody have any experience with issues on the HP 5335A's ?
> >> 
> >> Cheers
> >> j.
> >> 
> >> 
> >> --
> >> --
> >> Teach your kids Science, or somebody else will :/
> >> 
> >> jason at ball.net
> >> vk2vjb at google.com <vk2flnx at google.com>
> >> callsign: vk2vjb
> >> 
> >> 
> > 
> > 
> > -- 
> > --
> > Teach your kids Science, or somebody else will :/
> > 
> > jason at ball.net
> > vk2vjb at google.com <vk2flnx at google.com>
> > callsign: vk2vjb
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