Products > Test Equipment
Does anyone here use the Peak Lcr45? Max Inductance?
<< < (3/5) > >>
rwgast_lowlevellogicdesin:
I had no idea the voltage effected inductance that much! If your just measuring windings to get there to calculate there ratio yo each other i wouldnt think the absolute measurements would matter?
Martin72:
You would have to try it out, I can do it tomorrow, then also with an Atlas LCR, but also div others at work.
The ratio between primary and secondary windings is best measured with a voltage supply.
For example, you feed in 50Vac primary, if you then measure 5Vac secondary, you know the ratio (1:10).
If you want to know the number of windings, you have to determine at least one side, the other results from the ratio(or measure it too).
Only works with non-potted transformers:
-Loop a wire around the core (equal to one turn).
-Apply voltage to the winding of which you want to know the number of turns.
-Measure the voltage on the one wire.
-Example: Supply 20Vac to the winding, measure 100mV on the one wire = 200 turns.
-Polarity test:
Measure voltages with an oscilloscope, 1 channel primary, 1 channel secondary, view phase relationship.
And so on...
Grandchuck:

--- Quote from: rwgast_lowlevellogicdesin on August 11, 2024, 06:20:25 pm ---I had no idea the voltage effected inductance that much! If your just measuring windings to get there to calculate there ratio yo each other i wouldnt think the absolute measurements would matter?

--- End quote ---
Shown below is another example at 0.1V, 0.5V, and 1V at a frequency of 100 Hz.  At 10 kHz, there is much less variation due to excitation voltage and the readings are all around 8 H.
rwgast_lowlevellogicdesin:
When you buy a standard inductor, and it is idk 10microHenerys lets say, how do they get that number. I know that there usually tested at 100khz or whatever but what is the standard voltage used?

I really wish there was something like the Bode frequency analyzer at a reasonable price. Once you get to RF and everything is 50ohm and you can use a VNA measuring this stuff is so much easier. I will probably never need to wrap or use an inductor in a circut using 2v or less.

Lets say im working on a 50v 500khz boost converter and i need to wrap a 10microHenery as part of the circuit, is there any way to test my inductor without breaking the bank. At this point i feel like there are a lot of situations where you just pick a core material use a winding calculator and call it a day!
Martin72:

--- Quote from: rwgast_lowlevellogicdesin on August 11, 2024, 10:19:11 pm ---When you buy a standard inductor, and it is idk 10microHenerys lets say, how do they get that number. I know that there usually tested at 100khz or whatever but what is the standard voltage used?

--- End quote ---

It is usually stated in the data sheet how the measurements were taken.
So with chokes, transformers have to be assessed differently again.
With normal mains transformers, inductance is more of a nice to know.
With high-frequency switching power supply transformers, the situation is different, depending on the topology used.

Navigation
Message Index
Next page
Previous page
There was an error while thanking
Thanking...

Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod