I would like to drive a 12V DC hydraulic valve coil using a high side driver (VN7140AJ). The driver datasheet specifies the maximum demagnetization energy (page 24), and I would like to make sure that I can drive the coil without damaging the driver.

The datasheet for the valve does not specify its inductance and the manufacturer doesn't seem to know what I am talking about, so I decided to measure the coil inductance myself. I have a DE-5000 LCR meter, but depending on the frequency I select, the measured inductance changes:

• 100 kHz → 4.681 mH
• 10 kHz → 7.578 mH
• 1 kHz → 21.79 mH
• 120 Hz → 52.44 mH
• 100 Hz → 55.71 mH

What frequency setting should I choose on the LCR meter, to obtain a value that can be checked against the demagnetization graph in the driver datasheet?