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Yokogawa-Hewlett-Packard (YHP) Model SI-100 Standard Inductor, nominal 100 mH.

BOTTOM LINE UP FRONT (BLUF)

I measured a variety of parameters using a BK Precision 879B LCR meter and a Fluke DMM. All measurements are internally consistent and indicate a healthy, functional standard inductor very close to its nominal 100 mH value.

The measured inductance was 99.47 mH at 120 Hz and 99.52 mH at 1 kHz, both within approximately 0.5% of the nominal value shown on the nameplate. In fact, the standard may be closer to exactly 100 mH than the accuracy of my test equipment can verify.

In short: this standard appears to be good, accurate, and trustworthy.

Measured Data and Consistency Checks

Parameter	Measured Value	Reference / Basis	Difference
L @ 120 Hz	99.47 mH	100.00 mH (nameplate value)	-0.53 mH (-0.53%)
L @ 1 kHz	99.52 mH	100.00 mH (nameplate value)	-0.48 mH (-0.48%)
DC Resistance	65.0 Ω	Fundamental measurement (Fluke DMM)	N/A
Impedance @ 1 kHz	628.7 Ω	Predicted from measured L and DCR = 628.68 Ω	+0.02 Ω (+0.003%)
Parallel Resistance (Rp) @ 1 kHz	6.062 kΩ	Fundamental measurement (BK 879B)	N/A
L @ 10 kHz	105.02 mH	100.00 mH (nameplate value)	+5.02 mH (+5.02%)
Q @ 2 kHz	9.583	Predicted from XL / ESR = 9.582	ΔQ ≈ 0.001 (<0.01%)
XL @ 2 kHz	—	Calculated from measured inductance: XL = 2πfL = 1250.6 Ω	N/A

Internal Consistency Check

Using the measured inductance of 99.52 mH at 1 kHz:

XL = 2πfL = 625.3 Ω

Combining this with the measured 65.0 Ω DC winding resistance predicts

Note to me: Garage, right side, in blue & white PowerPak box with blue gaffer's tape on it marked ?!

I normally ship within 24 hours of your order, but the post office does not always initiate tracking when I put the packages in the drop off box.

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Brand	Yokogawa
MPN	SI-10
Country of Origin	United States

Yokogawa Hewlett-Packard SI-100 Standard Inductor 100mH Tested 99.62mH 65Ω YHP

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