I have a dead Ac/Dc adaptor. I'm busted it just to learns stuff.
Im trying to learn how to test Transformers. This transformer says on
it AMS10405 RG 1320F. I provide this to give all information, however
Im not sure it matters much to my question.
I have so far removed from what I can gather are the Primary wires
from the board. I assume they are because they are white and black and
are literal wires going into transformer, as oppose to all the other connections which appear to be pins in the circuit board. I believe
to properly test transformer you need to remove it fully eventually.
Here are my results with digital tester, When set to continuity, which appears to be (2) ohms setting. I get Beep and .002 Ohms.
This seems to be very low ohms.
On 2023-02-22, StevWolf wrote:
I have a dead Ac/Dc adaptor. I'm busted it just to learns stuff.Can't find the part with a quick google. I'm going to assume it's not generally for sale (e.g. only sold in the Chinese market for making
Im trying to learn how to test Transformers. This transformer says on
it AMS10405 RG 1320F. I provide this to give all information, however
Im not sure it matters much to my question.
other stuff with; or old).
I have so far removed from what I can gather are the Primary wires
from the board. I assume they are because they are white and black and
are literal wires going into transformer, as oppose to all the other connections which appear to be pins in the circuit board. I believe
to properly test transformer you need to remove it fully eventually.
Here are my results with digital tester, When set to continuity, which appears to be (2) ohms setting. I get Beep and .002 Ohms.Might be that you're misinterpreting the meter. Mine here _always_
This seems to be very low ohms.
shows the decimal point when in continuity mode. If yours is like mine
in that regard, it's not supposed to be read as "2 milliohms", but
rather "2 ohms" (which might be a concerningly high value, depending on
how large this transformer happens to be).
Quick sanity check for yourself -- grab something you know the
resistance of (or can check easily), such as a 100 ohm resistor. You'll probably see it displayed in the range of " .105" to " .095" (under the assumption of a standard 5% tolerance resistor).
My meter here does have some error between resistance and continuity, generally with continuity mode showing an ohm or two less than
resistance mode; at least across the 10 resistors I tested with just
now.
HTH :)
[on 2023-02-22, I wrote]
[...]
Quick sanity check for yourself -- grab something you know the
resistance of (or can check easily), such as a 100 ohm resistor. You'll
probably see it displayed in the range of " .105" to " .095" (under the
assumption of a standard 5% tolerance resistor).
My meter here does have some error between resistance and continuity,
generally with continuity mode showing an ohm or two less than
resistance mode; at least across the 10 resistors I tested with just
now.
HTH :)
Well thanks for your comments. You have encouraged me to dig into my
meter a bit.
Here are some results of my meter using some resistors I have.
100R set to 200 is 107 Ohms - Ok I guess
1 R set to Continuity says .974 Ohms - Yes seems OK.
.39 R set to Continuity says .002 - thats close
.39 set to 200 says 3.6 (which seems odd to me
Importantly The manual for the for the meter seems to say that it will
show continuity for anything less than 50ohms.
Also while the meter has no information about the following, in the
manual, when I set it to Continuity there is a little 2 under the
decimal point, in the same way that it shows up when set to 200 for
example with the respective 200 under the decimal. I asume that means
2 Ohms,
Sooo Im still trying to figure out if this transformer primary is bad?
Maybe transformers which are basically two sets of winding in simple transformers dont have much resistance.
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On 2023-02-22, StevWolf wrote:
[on 2023-02-22, I wrote]
[...]
Quick sanity check for yourself -- grab something you know the
resistance of (or can check easily), such as a 100 ohm resistor. You'll >> probably see it displayed in the range of " .105" to " .095" (under the >> assumption of a standard 5% tolerance resistor).
My meter here does have some error between resistance and continuity,
generally with continuity mode showing an ohm or two less than
resistance mode; at least across the 10 resistors I tested with just
now.
HTH :)
Well thanks for your comments. You have encouraged me to dig into my
meter a bit.
Here are some results of my meter using some resistors I have.
100R set to 200 is 107 Ohms - Ok I guess107 ohms is within 10% tolerance; so it's fine assuming it's got a
silver (or no) tolerance band. What did this show in continuity mode?
The range doesn't "really" come into play here (it just means you can accurately measure from 0 Ohms to 199 Ohms; usually to the nearest
tenth)
1 R set to Continuity says .974 Ohms - Yes seems OK.What did this resistor show in Resistance mode? I mean if your display
works the same as mine, it's showing just shy of 1k ohms.
.39 R set to Continuity says .002 - thats closeWith the assumption your display operates the same as mine, 2 ohms is nowhere near 0.39 Ohms. Likewise if it really is showing milliohms; 2 milliohms is nowhere near 390 milliohms.
.39 set to 200 says 3.6 (which seems odd to me
3.6 ohms reading on a 3.9 ohm resistor is within 10% tolerance. Color marking would be Orange, White, Gold; with a Silver (or no) tolerance
band.
(0.39 ohms would be Orange|White|Silver).
Importantly The manual for the for the meter seems to say that it will show continuity for anything less than 50ohms.Means it'll beep if the circuit total resistance is 50 Ohm or less -- so
a 100 Ohm resistor will never beep, but a 47 Ohm resistor most likely
will (noting, of course that 10% tolerance can get you as high as 51
Ohms).
Also while the meter has no information about the following, in the manual, when I set it to Continuity there is a little 2 under theWhat's the meter make/model?
decimal point, in the same way that it shows up when set to 200 for example with the respective 200 under the decimal. I asume that means
2 Ohms,
Sooo Im still trying to figure out if this transformer primary is bad?You get continuity, chances are "no", unless it's supposed to have more resistance than it does. But we'd need a datasheet or technical manual
to know for sure (I mean I have a couple of old rail locomotive
maintenance manuals that're like "if you need to rewrap the solenoid,
use 28AWG magnet wire until you get 75 ohms in the coil")
Maybe transformers which are basically two sets of winding in simple transformers dont have much resistance.Depends on the wire gauge. For example, 30 AWG magnet wire is something
like 100 Ohms / 1000 feet.
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|_|_|O| Github: https://github.com/dpurgert
|O|O|O| PGP: DDAB 23FB 19FA 7D85 1CC1 E067 6D65 70E5 4CE7 2860
On Thursday, February 23, 2023 at 6:43:16 AM UTC-5, Dan Purgert wrote:
100R set to 200 is 107 Ohms - Ok I guess107 ohms is within 10% tolerance; so it's fine assuming it's got a
silver (or no) tolerance band. What did this show in continuity mode?
The range doesn't "really" come into play here (it just means you can
accurately measure from 0 Ohms to 199 Ohms; usually to the nearest
tenth)
[...]
Well to try to answer questions,
100 ohm Resistor on continuity is .145 oddly
.39 ohm Resistor on 200 scale is 7.6 again oddly
Model of meter is MTP model 2322
The thing is its dashes ones Hope's when every website on testing says
check data sheet, when they are so scarce if at all. And the numbers
on the transformer so cryptic. I get that you need it but, they seem
hard to come by so i assume you there must be charts to guestemate .
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On 2023-02-23, StevWolf wrote:
On Thursday, February 23, 2023 at 6:43:16 AM UTC-5, Dan Purgert wrote:
100R set to 200 is 107 Ohms - Ok I guess107 ohms is within 10% tolerance; so it's fine assuming it's got a
silver (or no) tolerance band. What did this show in continuity mode?
The range doesn't "really" come into play here (it just means you can
accurately measure from 0 Ohms to 199 Ohms; usually to the nearest
tenth)
[...]
Well to try to answer questions,Okay, and it shows 100 (+/- 10%) on the Resistance scale?
100 ohm Resistor on continuity is .145 oddly
.39 ohm Resistor on 200 scale is 7.6 again oddlyWhat's the banding on this resistor? Also; have you checked the leads themselves?
Model of meter is MTP model 2322I can't find a single thing about this online. Must be old?
The thing is its dashes ones Hope's when every website on testing says check data sheet, when they are so scarce if at all. And the numbersNo, there are datasheets... but old stuff might not have them (or
on the transformer so cryptic. I get that you need it but, they seem
hard to come by so i assume you there must be charts to guestemate .
they're limited to china markets )
On Thursday, February 23, 2023 at 6:26:45 PM UTC-5, Dan Purgert wrote:
On 2023-02-23, StevWolf wrote:
[...]Okay, and it shows 100 (+/- 10%) on the Resistance scale?
100 ohm Resistor on continuity is .145 oddly
.39 ohm Resistor on 200 scale is 7.6 again oddlyWhat's the banding on this resistor? Also; have you checked the leads
themselves?
Model of meter is MTP model 2322I 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.
The .39 ohm resistor is a 2 watt orange, white, silver, gold.
The leads are in good condition.
Actually I have found several links for this meter. Here is one.
https://www.directindustry.com/prod/mtp-instruments-inc/product-131921-1932654.html
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.
On Thursday, February 23, 2023 at 6:26:45 PM UTC-5, Dan Purgert wrote:less available. And if Chinese transformers are less likely then we are really out of luck as almost everything is made there.
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On 2023-02-23, StevWolf wrote:
On Thursday, February 23, 2023 at 6:43:16 AM UTC-5, Dan Purgert wrote:
100R set to 200 is 107 Ohms - Ok I guess107 ohms is within 10% tolerance; so it's fine assuming it's got a
silver (or no) tolerance band. What did this show in continuity mode? >>
The range doesn't "really" come into play here (it just means you can >> accurately measure from 0 Ohms to 199 Ohms; usually to the nearest
tenth)
[...]
Well to try to answer questions,Okay, and it shows 100 (+/- 10%) on the Resistance scale?
100 ohm Resistor on continuity is .145 oddly
.39 ohm Resistor on 200 scale is 7.6 again oddlyWhat's the banding on this resistor? Also; have you checked the leads themselves?
Model of meter is MTP model 2322I can't find a single thing about this online. Must be old?
Yes the 100 ohm resistor shows 100 ohms on the 200 scale.The thing is its dashes ones Hope's when every website on testing says check data sheet, when they are so scarce if at all. And the numbersNo, there are datasheets... but old stuff might not have them (or
on the transformer so cryptic. I get that you need it but, they seem hard to come by so i assume you there must be charts to guestemate .
they're limited to china markets )
The .39 ohm resistor is a 2 watt orange, white, silver, gold.
The leads are in good condition.
Actually I have found several links for this meter. Here is one.
https://www.directindustry.com/prod/mtp-instruments-inc/product-131921-1932654.html
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
Regards.Put that 100Ω resistor in series with the transformer primary and measure the resistance of both of them together.
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