HP 5091-1596E free download

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Agilent High Accuracy and Fast RF Inductor Testing Application Note 369-10 Agilent 4285A Precision LCR Meters Introduction Problems and the solutions offered by the Agilent 4285A RF inductors are employed in electronic equipment such 1. Measurement accuracy and measurement speed as VCRs and intermediate frequency (IF) circuits for Stable inductance (L) and quality factor (Q) low AM/FM radios, mobile radios, pagers and code-less inductance measurements are difficult to make, because telephone, which require RF inductors to be smaller, measuring low inductance values means measuring low lower cost, and have higher reliability. This application impedance, values. If a higher measurement frequency note describes solutions offered by the Agilent 4285A (MHz) is issued to increase the measured impedance, precision LCR meter for realizing these requirements. the LCR meter's measurement accuracy is worse, Information for accurate and fast RF inductor testing, so accurate measurement data cannot be obtained. and for practical simple test systems are discussed. The 4285A can perform reliable and fast measurements with 0.5% inductance measurement accuracy even in the MHz frequency range, and with a 30 ms measurement speed. Formerly LCR meters could not measure accurately enough for testing high Q inductors, and Q meters required long measurement time and high operator skill. Table 1 lists the 4285A's key specifications. 2. Measurement condition setup There are many types of RF inductors, so the measurement frequency range for an inductor is selected from across a frequency range spanning kHz through MHz, depending on the inductance value to be measured and