Agilent Technologies DC110 Especificações descarregar pdf (Página 73)

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3.3 Test Fixture’s Adaptability for a Particular Measurement:

In order to make use of what has been discussed previously, the test fixture’s adaptability for a particular measurement

will be discussed. To see whether a test fixture is adaptable, it is important to think about the test fixture’s additional

error (proportional error, short repeatability, and open repeatability), measurement impedance, and the test frequency

range.

If the measurement impedance is in the 1 Ω to 10 kΩ range, use only proportional error to calculate the additional error

of the test fixture. It is fine to assume that this is a close approximation to the fixture’s additional error.

If the measurement impedance is not in this range, use proportional error, short repeatability, and open repeatability to

calculate the test fixture’s additional error. Recent test fixtures have all three terms specified in their operational manu-

al, so use these values for the calculation.

Some of the recent test fixtures (16044A), due to their structure, have different performance characteristics with differ-

ent measurement instruments. For these test fixtures, refer to their operational manual for more details about the spec-

ifications.

If the test fixture is not specified with short and open repeatability, how can the test fixture's adaptability be deter-

mined? To measure a test fixture’s short repeatability, measure the impedance of the short condition after performing

short compensation. Take the shorting plate out of the fixture and then replace it. Measure the short condition again.

By repeating this process at least 50 times, it will show the variations in the measured impedance of short condition

(See figure below). The final step to determine an approximation of short repeatability is to add a margin to the values

obtained. For open repeatability, measure the admittance of the test fixture’s open condition. In the same way, deter-

mine open repeatability by measuring at least 50 times.

Speciﬁcations of

Short Repeatability

Actual Measurement

of Short Repeatabilit

Measurement of short repeatability (16034G)

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Agilent Technologies DC110 Especificações Página 73