Agilent Technologies 4294A Specifications download pdf (Page 55)

Figure 4-3. Open/short compensation

4-2-3. Precautions for open and short measurements

When an open measurement is made, it is important to accurately measure the stray capacitance.

To do this, keep the distance between the test fixture terminals the same as when they are holding

the DUT, set the integration time, averaging, and OSC level so that the instrument measures with

maximum accuracy. If an open measurement is performed under improper conditions, stray admit-

tance Yo is not correctly measured, resulting in measurement error.

Short measurement is performed by connecting the test fixture terminals directly together or by

connecting a shorting device to the terminals. The residual impedance contained in the shorting

device should be much lower than the DUT’s impedance, otherwise it will directly affect the mea-

surement results. Figure 4-4 shows an example of a shorting device that is applicable to the 16047A,

16047C and 16047D test fixtures. This shorting bar (Agilent PN: 5000-4226) typically has residuals

of 20 nH and 1 mΩ. Hence, the shorting bar is not suitable for low impedance measurement. For

very low impedance measurement, you should use a test fixture in which the fixture terminals can

be connected directly together.

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Agilent Technologies 4294A Specifications Page 55