Testing Unknown Transformers with Function Generator

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In this video, I showed how to test and characterize unknown signal/pulse transformers with a function generator and a multimeter.

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When testing these transformers, if you don't know what type of transformer you have and you don't know which side is the primary and which is the secondary, could it happen for example that you connect the test signal to the output of a step-down transformer and you actually measure a stepped-up voltage at it's input?(which in this case where connected backwards has become an output) mistaking that transformer for a step-up one.

voltlog
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It's been over 40 years since I studied this stuff in tech school, and as usual I got into a niche where I never used 90% of what I was taught. Now I'm retired and getting back into electronics and reviewing topic by topic, component type by component type applicatiopn by application.

maxpolaris
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Interesting - how would one set up a sort of 'Bode' plot arrangement with a sweep generator / DSO to get an overall plot of response?

gervaiscurrie
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I use a fine-tip marker to mark *winding segments* along with *dot polarity markings* on typical pulse transformers.

CliveChamberlain
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Very useful tip! You can also use an oscilloscope if you don't have capable multimeter, some scopes even can calculate the ratio between channels.

ketturi
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At 3:18
What do you mean by saying that the output of the function generator is terminated at 50 Ohms ?

suhailasaba
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This technique will provide a rough start. Determining actual primary, current capability, insulation resistance, actual turns ratio, and other parameters will require more digging.

kmgy
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nice video, could you also explain best practice for identifying and separating the primary/secondary windings on devices with more than 4 pins?

DextersTechLab
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Did you offset the sig Gen so sine wave was ac?

michaeld
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Great channel! and thank you for sharing and thanks youtube for suggesting! 👍👌

hadireg
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How pulse transformer behaves with pulse input i tried to check but i don't know end result. My input waveform is getting squeezed as i connect to transformer.

akshaymath
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I dont understand. Does that mean that the transformer can only operate at a given frequency (i.e. at resonance?)

coucouj
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I like this video and I'd like to know more about how other parameters of the transformers can be characterized with non expensive tools. For example you show at which frequency the transformed voltage is at maximum but that may not be the best operating point for maximizing power transfer (which also depends, i guess, on the characteristics of the load)

marcocosentino
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is there transformer can be connected to function generator and step up the voltage to 1 kv at frequency 1khz??

hassaneinshaban
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Hi Kerry, I am trying to learn about these transformer. I really like the way you explain it. Thank you. However, I do not have a function Generator but I have a signal generator from 0.1 to990 MHz will that work?

ElectrolabAg
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Hell yeah I'm going to subscribe. Thank you so much. I think I just learned more than a semester of college here.
Could you please tell me how you know which side of the Transformer is the output and which side is input? because I don't think you clear that up in the video. And I desperately need to know

AB-yutj
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Ok, this video is actually OK after watching several that wasted my time :D. You've mentioned smaller transformers, what about those with 380V on the primary like Hlaft Bridge ones yet still HFs? Can you measure them the same way? If not, what way?

screen-protector
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i think you have to saturate the transformer to find out its best frequency, not that it is designed like that but for this example results are not correct, if i am correct .

dedskin
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Rather too much emphasis on frequency. Many people just want o confidently ID the primary & secondary terminals & what happens if accidentally thedeiign with say mains voltage?

peterowens
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5:30 Sadly very unclear...."If I change it to 1.5 1.6 what?? hz Khz Mhz?? Volts? Amps?

muppetpaster