Specifications

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Error Compensation

Agilent measurement instruments incorporate one of the following four types of error compensation functions to eliminate

residual impedance effects in test fixtures:

1. Open/short Compensation

For a simple measurement system, represented by the equivalent circuit model shown below, residual impedance val-

ues Rs and Ls and admittance values Co and Go can be corrected by:

(i) Measuring open condition for the test fixture’s admittance.

(ii) Measuring short condition for the test fixture’s impedance

(iii) Measuring the test sample, then subtracting the admittance

and impedance.

The above procedure is performed internally by the open/short

compensation. When the test fixture is directly connected to the

measurement instrument, the open/short compensation suffi-

ciently corrects the measurement error.

2. Open/short/load Compensation

When the measurement system is too complicated to be repre-

sented as the above equivalent circuit model, the open/short compensation cannot completely compensate for the

residual impedance. In this case, the open/short/load compensation is used rather than the open/short compensation.

The open/short/load compensation is particularly effective when, for example, the 16065A is used with the measure-

ment instrument.

The following table lists measurement instruments and available compensation functions.

–: N/A

●: Available

* denotestheinstrumentisobsolete.

Note: For more details of the compensation functions, refer to the instruction manuals supplied with

the measurement instrument.

Appendix Compensation

Test Fixture

Instrument

DUT

Model Open compensation Short compensation Load compensation Load's input parameters

4263B ● ● ● Z-Q, R-X, Cp-D, Cp-Q, Cp-G, Cp-Rp, Cs-D, Cs-Q,

Cs-Rs, Ls-D, Ls-Q, Ls-Rs

4268A* ● ● ● Cp-D, Cp-Q, Cp-G, Cp-Rp, Cs-D, Cs-Q, Cs-Rs

4279A* ● ● ● Cp-D, Cp-G

4284A* ● ● ● same as measurement parameters

4285A ● ● ● same as measurement parameters

4287A* ● ● – –

4288A* ● ● ● Cp-D, Cp-Q, Cp-G, Cp-Rp, Cs-Q, Cs-Rs

4291B* ● ● ● Rs-Ls

4294A ● ● ● Rs-Ls

4338B* – ● – –

4339B* ● – – –

4349B* ● – – –

E4980A ● ● ● same as measurement parameters

E4981A ● ● ● Cp-D, Cp-Q, Cp-G, Cp-Rp, Cs-D, Cs-Q, Cs-Rs

E4982A ● ● – –

E4991A ● ● – –