Hi,
Today i measured the single coil inductance of a common mode choke (PE-53914NL) with the Tenma
72-960 LCR meter.
The coil read 30mH on the 120Hz setting
It measured 40mH on the 1kHz setting.
The datasheet says its 13.2mH.
The leakage inductance, with this LCR meter, was 70uH on 1kHz setting
..and 100uH on 120Hz setting.
A nominal 1mH inductor measured 1.1mH , so sometimes it can be quite accurate.
When i press to calibrate it it only asks me to short the terminals, -unfortunately does not ask me to open them.
Anyway, LCR meters , wherever you go, are invariably poor. They are often damaged since people measure capacitors with a few 100V's on them, and that breaks
the LCR meter for good. But it often seems to work, so you persevere with it, and waste your time.
Do you agree, the attached, (LTspice and jpeg) simple, home-brew 555 timer based device is by far the best way to measure inductances?...it simply allows you to put it into a resonant circuit with a
known capacitor, and then you read off the resonant frequency on a scope.
Its cheap, so if you break it, just make another one.
Why is it not more used?
PE-53914NL common mode choke
https://www.mouser.co.uk/datasheet/2/447/SPM2007_62-2904079.pdfTenma 72-960 LCR meter
https://manualzz.com/doc/6845245/72-960-tenma-vom-meter