Agilent Technologies 4294A Specifications download pdf (Page 63)

k value is a decimal number mostly within the range of -1 to +1 and different for different instru-

ments. As the above equation shows, the error rapidly increases in proportion to square of mea-

surement frequency. Using open/short compensation will not reduce this error. Only

open/short/load compensation can minimize this error.

(2) Cable extension with termination

Extending the test cables from the instrument with cable termination will not produce a large error

for the magnitude of measured impedance, but cause a phase error in proportion to the extension

length and measurement frequency. (In practice, an error for the magnitude of impedance also

occurs because the actual cable termination is not ideal.) Performing the open/short/load compen-

sation at the end of the cable can eliminate this error.

4-5. Practical compensation examples

The error sources present in a practical measurement setup are different for the configuration of

test fixtures, test cables or circuits which may be connected between the instrument and the DUT.

Appropriate compensation methods need to be applied depending on the measurement configura-

tion used. The Figure 4-12 shows examples of the compensation methods that should be used for

typical measurement setups.

4-11

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Agilent Technologies 4294A Specifications Page 63