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Re: testing NTC caps

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From	"Tom Del Rosso" <fizzbintuesday@that-google-mail-domain.com>
Newsgroups	sci.electronics.design
Subject	Re: testing NTC caps
Date	Wed, 8 Feb 2017 02:41:55 -0500
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John Larkin wrote:
> On Tue, 7 Feb 2017 19:40:06 -0500, Phil Hobbs
> <pcdhSpamMeSenseless@electrooptical.net> wrote:
>
>> On 02/07/2017 06:36 PM, 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.
>>
>> There are small beer fridges that have heating capability too, for
>> some reason, e.g.
>> https://www.amazon.com/Desktop-Fridge-Cooler-Personal-Black/dp/B005JAVC94
>
> Warm beer? Yuk.
>
> That might work, maybe connected to a DC power supply to adjust the
> temp. For $29, it's no big risk to try.

For $2 more this gets to 300 F.

https://www.amazon.com/dp/B00030DLEE

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

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