Appendix compensation, Error compensation, Open/short compensation – Atec Agilent-16047A User Manual
Page 99: Open/short/load compensation
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, resid-
ual impedance values 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 mea-
surement instrument, the open/short compensation suf-
ficiently corrects the measurement error.
2. Open/short/load Compensation
When the measurement system is too complicated to be represented 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 measurement instrument.
The following table lists measurement instruments and available compensation functions.
–: N/A
●: Available
* For more details of the compensation functions, refer to the instruction manuals supplied with the
measurement instrument or Application Note 346-3 (P/N 5091-6553E)
94
Appendix
Compensation
Test Fixture
Instrument
DUT
Model
Open Short Load
Load’s input parameters
compensation
compensation
compensation
4192A
●
●
–
–
4194A
●
●
–
–
4263A
●
●
●
R-X (GPIB only)
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
4278A
●
●
●
Cp-D, Cp-G
4279A
●
●
●
Cp-D, Cp-G
4284A
●
●
●
same as measurement parameters
4285A
●
●
●
same as measurement parameters
4286A
●
●
●
Rs-Ls
4287A
●
●
–
–
4288A
●
●
●
Cp-D, Cp-Q, Cp-G, Cp-Rp, Cs-Q,
Cs-Rs
4291A/B
●
●
●
Rs-Ls
4294A
●
●
●
Rs-Ls
4338B
–
●
–
–
4339A/B
●
–
–
–
E4991A
●
●
–
–