Groups > sci.electronics.design > #446777

Re: testing NTC caps

Path	csiph.com!eternal-september.org!feeder.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail
From	Clive Arthur <cliveta@nowaytoday.co.uk>
Newsgroups	sci.electronics.design
Subject	Re: testing NTC caps
Date	Wed, 8 Feb 2017 15:12:08 +0000
Organization	A noiseless patient Spider
Lines	37
Message-ID	<o7fccp$t70$1@dont-email.me> (permalink)
References	<iclk9cp9l3b7oidhpb2asjuaap7snjdhmj@4ax.com>
Reply-To	cliveta@nowaytoday.invalid
Mime-Version	1.0
Content-Type	text/plain; charset=windows-1252; format=flowed
Content-Transfer-Encoding	7bit
Injection-Date	Wed, 8 Feb 2017 15:10:17 -0000 (UTC)
Injection-Info	mx02.eternal-september.org; posting-host="a070c05c7e8eea278ec037c3b0adcecd"; logging-data="29920"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX1/BrPbibMC1hnOMpod4nRuD3DKIFL/MRqE="
User-Agent	Mozilla/5.0 (Windows NT 6.3; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.7.0
In-Reply-To	<iclk9cp9l3b7oidhpb2asjuaap7snjdhmj@4ax.com>
Cancel-Lock	sha1:ayvolDFa8KolwvpKU30Lk9TlslQ=
Xref	csiph.com sci.electronics.design:446777

Show key headers only | View raw

On 07/02/2017 23:36, John Larkin wrote:
>
>
> We special-ordered a reel (4000 pieces) of NTC caps from Capax. They
> are 0805, 3.3 pF, N4700. 23 cents each.
>
> I figured I should test them. I made an oven out of a roll of solder,
> with the cap and a thermocouple inside.
>
> https://dl.dropboxusercontent.com/u/53724080/Parts/Caps/NTC_Setup.JPG
>
> It has a nice long thermal time constant. I started with a heat gun to
> get it to 50C, covered it with a cloth, and took data slowly as it
> cooled. Near room temp, a spritz of freeze spray into the solder coil
> cooled it down, and then I took data as it slowly warmed up.
>
> https://dl.dropboxusercontent.com/u/53724080/Parts/Caps/NTC_Data.JPG
>
> The measured tempco is close to -7000, but that's OK. I'm going to
> compensate a 600 MHz coaxial ceramic resonator oscillator, with this
> cap and a series NPO padder, so too-high tempco is OK.
>
> It would be great to have a very small benchtop oven, peltier
> hot/cold, to test small parts or circuits.
>
>
I use a vacuum flask with wadding in the neck.  I use a small aquarium 
bubbler pump to pump air through silicone tubing via a power resistor 
(one with a cooling tube through the middle) through the wadding to the 
bottom of the flask.  A cheap Chinese PID controller and solid state 
switch to heat the resistor closes the loop.

It's nice and even, low power and can be left on for days.

Cheers
-- 
Clive

Thread

testing NTC caps John Larkin <jjlarkinxyxy@highlandtechnology.com> - 2017-02-07 15:36 -0800
  Re: testing NTC caps Lasse Langwadt Christensen <langwadt@fonz.dk> - 2017-02-07 15:41 -0800
  Re: testing NTC caps Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-02-07 19:40 -0500
    Re: testing NTC caps John Larkin <jjlarkinxyxy@highlandtechnology.com> - 2017-02-07 17:18 -0800
      Re: testing NTC caps "tom" <tmiller11147@verizon.net> - 2017-02-08 00:21 -0500
        Re: testing NTC caps John Larkin <jjlarkin@highlandtechnology.com> - 2017-02-08 08:41 -0800
      Re: testing NTC caps "Tom Del Rosso" <fizzbintuesday@that-google-mail-domain.com> - 2017-02-08 02:41 -0500
    Re: testing NTC caps bill.sloman@ieee.org - 2017-02-07 19:15 -0800
  Re: testing NTC caps Clive Arthur <cliveta@nowaytoday.co.uk> - 2017-02-08 15:12 +0000
    Re: testing NTC caps Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-02-08 11:47 -0500
      Re: testing NTC caps Clive Arthur <cliveta@nowaytoday.co.uk> - 2017-02-08 16:56 +0000
        Re: testing NTC caps Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-02-08 12:04 -0500
    Re: testing NTC caps John Larkin <jjlarkin@highlandtechnology.com> - 2017-02-08 08:49 -0800
      Re: testing NTC caps Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-02-08 11:57 -0500
        Re: testing NTC caps John S <Sophi.2@invalid.org> - 2017-02-08 13:02 -0600
          Re: testing NTC caps Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-02-08 16:14 -0500
            Re: testing NTC caps John Larkin <jjlarkinxyxy@highlandtechnology.com> - 2017-02-08 13:28 -0800
      Re: testing NTC caps Jeff Liebermann <jeffl@cruzio.com> - 2017-02-08 11:40 -0800
      Re: testing NTC caps Spehro Pefhany <speffSNIP@interlogDOTyou.knowwhat> - 2017-02-08 18:08 -0500
  Re: testing NTC caps Jeff Liebermann <jeffl@cruzio.com> - 2017-02-08 09:29 -0800
  Re: testing NTC caps Robert Baer <robertbaer@localnet.com> - 2017-02-08 21:45 -0800
    Re: testing NTC caps John Larkin <jjlarkinxyxy@highlandtechnology.com> - 2017-02-09 11:20 -0800
      Re: testing NTC caps Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-02-09 14:29 -0500
        Re: testing NTC caps Tom Gardner <spamjunk@blueyonder.co.uk> - 2017-02-09 22:52 +0000
          Re: testing NTC caps pcdhobbs@gmail.com - 2017-02-09 16:58 -0800
            Re: testing NTC caps Tom Gardner <spamjunk@blueyonder.co.uk> - 2017-02-10 09:01 +0000
            Re: testing NTC caps John Larkin <jjlarkinxyxy@highlandtechnology.com> - 2017-02-10 11:39 -0800
              Re: testing NTC caps Spehro Pefhany <speffSNIP@interlogDOTyou.knowwhat> - 2017-02-10 22:49 -0500
        Re: testing NTC caps krw@notreal.com - 2017-02-09 21:18 -0500
          Re: testing NTC caps pcdhobbs@gmail.com - 2017-02-09 18:54 -0800
            Re: testing NTC caps Clifford Heath <no.spam@please.net> - 2017-02-10 14:18 +1100

csiph-web