[time-nuts] Re: HP 5065A, no 2nd harmonic.

[Jared Cabot]

Well, I found it, the thermal fuse is open circuit.
If I briefly bypass it with a jumper wire, the oven pulls the expected current.

Looks like I need something that will trip at roughly around 115C, rated to 1.0A
(HP Part number 10811-80008)
Hopefully I can find something in Akihabara to make it easier to get my hands on ASAP...

Jared




‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐

On Wednesday, December 1st, 2021 at 00:41, Robert LaJeunesse <lajeunesse at mail.com> wrote:

> That film cap does look a little cooked. Since it is a 2uF 20% 50V part a more common 2.2uF 10% 63V part would likely be an acceptable substitute, and basically still within overall tolerance. Judging from the teflon solder cup used I suspect insulation resistance is a critical parameter. Be sure to clean away any flux remaining after soldering.
> 

> Bob L.
> 

> > Sent: Tuesday, November 30, 2021 at 9:36 AM
> > 

> > From: "Jared Cabot via time-nuts" time-nuts at lists.febo.com
> > 

> > To: "Discussion of precise time and frequency measurement" time-nuts at lists.febo.com
> > 

> > Cc: "Jared Cabot" jaredcabot at protonmail.com
> > 

> > Subject: [time-nuts] Re: HP 5065A, no 2nd harmonic.
> > 

> > ...
> > 

> > Also, I noticed that a 2.0uF, 20% film capacitor in there is looking like it's had a bit of heat-stroke.
> > 

> > It measures 2.119uF, 0.22ohm ESR, with a dissipation of 0.004 @ 40V, @ 1kHz, so it seems to test ok.
> > 

> > Does this look like it needs to be replaced (picture link below)? I can't find the same part on Digikey/Mouser, but it seems like Keysight have them as 'orderable' status.
> > 

> > Details are as follows: P/N: 0160-4947 Part Description: Capacitor-Fixed 2uF +-20PCT 50V polyester metallized THT
> > 

> > https://i.imgur.com/aZ0KUD8.jpg
> > 

> > Thanks!
> > 

> > Jared
> 

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