Specifications

4. Cable Length Compensation

When the test sample is measured with an instrument having a Four-Terminal Pair configuration,

the additional length of the test-lead extension between the instrument and the test sample, in con-

junction with the measurement frequency, influences the amplitude and phase of the signal being

measured. This must be taken into account, particularly for measurements performed at frequencies

of 100 kHz or higher, since the modification of the amplitude and phase of the signal can cause the

internal measurement circuit to malfunction or create an unexpected measurement error. Such cir-

cuit malfunctions and measurement errors can be avoided with cable length compensation. Cable

length compensation should therefore be performed prior to the open/short compensation.

When the following measurement instruments and test leads are used in combination, the undesired

effects described above can be eliminated by performing the cable length compensation (the values in

the table represent cable length settings):

–: N/A

: Available for 4284A with Option 006.

*: denotes the instrument is obsolete

Measurement Repeatability

Dirty electrodes on the test fixture cause an increase in the contact resistance. This increase in resis-

tance can cause poor measurement repeatability. Therefore, the electrode of the test fixture must be

kept clean when measurements are performed.

Appendix Compensation

Model 16048A 16048D 16048E 16048-60030 16048G 16048H

4263B 1 m 2 m 4m 1 m – –

4268A 1 m 2 m – 1 m – –

4279A* 1 m 2 m – 1 m – –

4284A* 1 m 2 m

4 m

1 m – –

4285A 1 m 2 m ––––

4288A 1 m 2 m – 1 m – –

4294A ––––1 m2 m

E4980A 1 m 2 m 4 m 1 m – –

E4981A 1 m 2 m – 1 m – –