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Re: Testing small Transformer questions

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On 2023-02-25, StevWolf wrote:
> On Thursday, February 23, 2023 at 6:26:45 PM UTC-5, Dan Purgert wrote:
>> On 2023-02-23, StevWolf wrote: 
>>> [...]
>> > 100 ohm Resistor on continuity is .145 oddly
>> Okay, and it shows 100 (+/- 10%) on the Resistance scale?
>> > .39 ohm Resistor on 200 scale is 7.6 again oddly
>> What's the banding on this resistor? Also; have you checked the leads 
>> themselves?
>> > Model of meter is MTP model 2322
>> I can't find a single thing about this online. Must be old?
>> [...]
>> No, there are datasheets... but old stuff might not have them (or 
>> they're limited to china markets ) 
>
> Yes the 100 ohm resistor  shows 100 ohms on the 200 scale.

Perfect.  Sounds like the continuity scale is off by a considerable
amount then.

>
> The .39 ohm resistor is a 2 watt  orange, white, silver, gold.

Perfect.  That might simply be too low if the LOWEST range your meter
does is 200 ohms. You'd likely want a 20 or 2 ohm range.

>
> The leads are in good condition. 

More that they can impart resistance / capacitance / etc into a circuit;
also selection of the terminals on the meter can matter.

>
> Actually I have found several links for this meter. Here is one.
>
> https://www.directindustry.com/prod/mtp-instruments-inc/product-131921-1932654.html

Yeah, I found that too; but no real information to be had.  They only
have a defunct link to the manufacturer's website for more details.

>
> Well as far as data sheets for transformers I find for me anyway,  I
> do not find them as easy to find as common as other small parts, I
> mean you can find a data sheet on almost any old transistor, triac
> diac or component etc. But l find transformers less available. And if
> Chinese transformers are less likely then we are really out of luck as
> almost everything is made there. 

There's a difference between "made for chinese markets" (such as what
one finds inside a cheapo USB hub / power supply / etc), and "made for
export markets" (such as what one finds everywhere).


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|_|_|O| Github: https://github.com/dpurgert
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Thread

Testing small Transformer questions StevWolf <colinmarr0@gmail.com> - 2023-02-22 05:52 -0800
  Re: Testing small Transformer questions Dan Purgert <dan@djph.net> - 2023-02-22 15:32 +0000
    Re: Testing small Transformer questions StevWolf <colinmarr0@gmail.com> - 2023-02-22 09:42 -0800
      Re: Testing small Transformer questions Dan Purgert <dan@djph.net> - 2023-02-23 11:43 +0000
        Re: Testing small Transformer questions StevWolf <colinmarr0@gmail.com> - 2023-02-23 10:00 -0800
          Re: Testing small Transformer questions Dan Purgert <dan@djph.net> - 2023-02-23 23:24 +0000
            Re: Testing small Transformer questions StevWolf <colinmarr0@gmail.com> - 2023-02-24 18:11 -0800
              Re: Testing small Transformer questions Dan Purgert <dan@djph.net> - 2023-02-25 14:00 +0000
              Re: Testing small Transformer questions Lamont Cranston <amdx62@gmail.com> - 2023-04-29 18:00 -0700

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