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A little tester to determine transformer PhaseDots with no scope or signal generator
A little tester to determine transformer PhaseDots with no scope or signal generator
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Old 9th June 2015, 08:49 PM   #11
Kiriakos is offline Kiriakos  Greece
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Step back all of you, a real electrician came in the village.
The all conversation is about a simple phase rotation verification.
Get this tool and enjoy.
UT15C Voltstick by UNI-T, product pictures by Kiriakos - ITTSB
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Old 9th June 2015, 09:27 PM   #12
Mark Johnson is offline Mark Johnson  United States
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A little tester to determine transformer PhaseDots with no scope or signal generator
The user manual for the VoltStick is online. I screen-captured the pages that discuss its Phase Rotation Test feature. When you connect VoltStick to a three phase power distribution cable (AC mains), VoltStick tells you whether Phase1, Phase2, and Phase3 are labelled correctly.

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File Type: png part2.png (72.6 KB, 422 views)
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Old 9th June 2015, 10:45 PM   #13
Kiriakos is offline Kiriakos  Greece
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Well, boys in electronics use breadboard to play with components I did my own experiment with regular transformer by feeding it with signal generator and by using my oscilloscope too.
The Oscilloscope was used with both channels mostly for voltage confirmation.

UT-15C when used between L1 and neutral works as single phase detector.
I can tell neutral from live.

In my experiment I did feed 2V at the side of 12V transformer and from the 220V side I got about 80V as output.
By having active the test bed, I did connected UT-15C at the input of signal generator (positive) side.
By touching the other end of this tester at the output of the transformer the Green arrows was changing direction according to polarity change.

I did read and find info of your circuitry that is about measuring phase shift, at no powered transformer.
Well in my experiment I used the power it self so to show me the way.

Now my opinion is that this PhaseDots / phase shift detection, does no seems crucial.
Especially when the output gets converted to DC.
Personally I can not imagine anything using plain AC other than tubes so to warm up.
Additionally any reverse placement of the power cord, it will destroy the perfect balance (if there is such a thing).

Bellow is a picture from the crime scene.
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Old 9th June 2015, 11:02 PM   #14
Mark Johnson is offline Mark Johnson  United States
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A little tester to determine transformer PhaseDots with no scope or signal generator
It turns out that I will have a few unused PCBs made from red laminate. While supplies last you can choose either red or green, whichever you prefer. When I run out of one or the other color, I'll post a message here and I'll stop accepting orders for that color.

The PCB shopper dot com website lets you specify the color of the boards when you ask for a price quote, and when you order boards. Red, white, green, blue, black, yellow, and purple are available from PCB fabs.

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Old 12th June 2015, 01:43 PM   #15
Mark Johnson is offline Mark Johnson  United States
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A little tester to determine transformer PhaseDots with no scope or signal generator
I've heard from early kit builders that the orientation of the LEDs might be a little confusing, so here is some additional information to help clarify the situation.

First of all, I apologize. The Kingbright LEDs I bought and shipped in the kits, really are confusing. Their datasheet mechanical drawing is attached below; notice that there isn't any "notch" or "flat spot" or mechanical key to help you visually determine which terminal is the anode and which terminal is the cathode (!!) The only difference you can see with the naked eye is: the cathode lead is shorter.

Fortunately we are resourceful people here at diyAudio, and so we realize that "visually" is not the only way to examine an LED. We've also got digital multimeters! If you get confused, or if you just want the extra reassurance of a double-confirmation, you can use the Diode Test feature of your DMM to tell you which end of an LED is the cathode and which end is the anode. Here are some internet resources to guide youI've also attached a couple images of the PhaseDots PCB (front side), showing how to install the LEDs. I hope these make it clear, how to orient the light emitting diodes when stuffing and soldering.

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File Type: png Stupid_Kingbright_Package.png (42.1 KB, 386 views)
File Type: png LEDs_on_PCB1.png (27.4 KB, 198 views)
File Type: png LEDs_on_PCB2.png (31.9 KB, 136 views)

Last edited by Mark Johnson; 12th June 2015 at 01:50 PM. Reason: replace redundant wording with clumsy wording instead
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Old 12th June 2015, 11:07 PM   #16
Kiriakos is offline Kiriakos  Greece
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You have to pay me 200$ for the tip that I gave ya which sends your circuitry to it grave.

If you plan to empty the pockets of lightweight thinking kids, by the excuse of selling them PCB, I am going to blow you out of the water.
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Old 12th June 2015, 11:20 PM   #17
kasey197 is offline kasey197
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A little tester to determine transformer PhaseDots with no scope or signal generator
Hey this is very useful - I have long forgotten custom toroids with multiple secondaries that I can never remember how to wire up for series/parallel as the wires are all the same color!

A whole lot bigger than your snubber rig though )
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Old 13th June 2015, 01:55 AM   #18
Mark Johnson is offline Mark Johnson  United States
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A little tester to determine transformer PhaseDots with no scope or signal generator
Kiriakos, thank you very much for posting your insight and wisdom here. I'm sure other members are grateful too.

Last edited by Mark Johnson; 13th June 2015 at 01:58 AM.
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Old 13th June 2015, 08:53 AM   #19
jitter is offline jitter  Netherlands
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Quote:
Originally Posted by Mark Johnson View Post
I've heard from early kit builders that the orientation of the LEDs might be a little confusing, so here is some additional information to help clarify the situation.

First of all, I apologize. The Kingbright LEDs I bought and shipped in the kits, really are confusing. Their datasheet mechanical drawing is attached below; notice that there isn't any "notch" or "flat spot" or mechanical key to help you visually determine which terminal is the anode and which terminal is the cathode (!!) The only difference you can see with the naked eye is: the cathode lead is shorter.
Well, there is another way if the LED is clear or semi-clear. There's a cup-like structure inside the LED. I guess it's what holds the junction as the light is emitted from it.
With normal LEDs, I have always seen that this structure is connected to the kathode and it clearly takes up more space inside the LED than the anode.

Click the image to open in full size.Click the image to open in full size.

Last edited by jitter; 13th June 2015 at 08:55 AM.
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Old 13th June 2015, 12:45 PM   #20
Ghianni is offline Ghianni  Greece
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Why you are searching for a tree and lose the forest?

Just use your digital multimeter at diode function and done. See the attached pic.

I do not agree that the gadget is useless. You can help you fast to verify primary/secondary/secondaries winding phasing which is important to Audio and RF signal transformers. I don't know if the frequency is suitable for RF transformers, though.
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Last edited by Ghianni; 13th June 2015 at 12:49 PM.
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