Electronics > Beginners
Check integrity of the coils in transformer
Jasonbit:
hello folks,
I have a simple transformer 230VAC to 12VAC (5VA). I want to test if the coil is in good condition. I take my multimeter, set it up as continuity check and put the probe in terminals primary and after I repeat the steps in secondary coil.
Primary: I took this value (806) without sound;
Secondary: I took this value (004) with sound;
Would not I be expected to get the continuity signal on both coils? Because the transformer is working properly. I have another transformer (200VA) where I get a beep on both coils.
Thanks
mvs:
Smaller transformer has higher primary coil resistance, so its ok that you do not get a beep.
Jasonbit:
--- Quote from: mvs on January 25, 2019, 09:54:08 am ---Smaller transformer has higher primary coil resistance, so its ok that you do not get a beep.
--- End quote ---
This means which the coil is good, because the multimeter can induces a current in the coil but it is not enough to get a beep, right? But how can I check the integrity of the coil?
Thanks
joseph nicholas:
Most DMM's (digital multimeters) will beep around 50 ohms or less in continuity mode. Your multimeter is working correctly and you have continuity in both winding.
Jasonbit:
This means if I get in my multimeter value infinity (like this image: https://d32c3oe4bky4k6.cloudfront.net/articles-videos/-/media/uscamediasite/images/story-images/2017/6/resistance_1803_cropped.ashx?la=en&modified=20170726020407&hash=710E29302E7B433AAC96832A89E6E401F8884D34) The coil it is spoiled. If I get a beep with value or a value without beep my coil it is good! Right?
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