HP 4277A Operation And Service Manual page 133

Model 4277A
SECTION IV
3) Inductance Accuracy Test
The 4277A inductance accuracy is theoretically certified if the capacitance accuracy
meets the specifications. Generally, inductors have unwanted parasitic impedances
such as coil resistance and distributed capacitance. As these residuals significantly
affect the inductance values at high frequencies, inductance standards useable in the
RF region above lOOkHz are substantially unavailable. Inductors with higher
inductance values have lower frequency limits.
GENERAL
The standards should be of four terminal pair configuration design to provide
compatibility with the instrument. This minimizes reduction in reliability of the
values due to the effects of the residuals associated with cabling and connections.
4-5