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

[Robert LaJeunesse]

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