Agilent Technologies 4275A User Manual

HEffective Impedance MeasurementUsing OPEN/SHORT/LOADCorrectionApplication Note 346-3This literature was published years prior to the establishment of

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10Model No. Correction Capability Cable Length CorrectionHP 4192A OPEN/SHORT Correction 0m/1m HP 4194A OPEN/SHORT Correction 0m/1m HP 4195A(*

HFor more information about Hewlett-Packard test & measurement products,applications, services, and for acurrent sales office listing, visitour we

1Figure 1. OPEN/SHORT Correction ModelSince Zs <<1/Yo, stray admittance Yo can be measured when the test termi-nals are open. Similarly residual

2 Zm-ZsZdut= ---------------------------------- l-(Zm-Zs)Yowhere,Zdut: True value of DUTZm: Measurement val

3Figure 2. OPEN/SHORT/LOAD Correction ModelWith the assumption that a DUT with an impedance of Z2 is connected to the front panel terminals, the instr

4Otherwise, when using other LCR meters or analyzers, a computer can be programmed to make the OPEN/SHORT/LOAD corrections through HP-IB.Consideration

5Figure 3. Cable Extension Using an HP 16048E (4m)impedance value. However, when the DUT's impedance value is very low or very high, it is recomm

6Figure 4. ComparisonBetween OPEN/SHORT Correction and OPEN/SHORT/LOAD CorrectionOPEN/SHORT/LOAD correction with an external controllerThe OPEN/SHORT/

7ConclusionThis application note shows the principle of the OPEN/SHORT/LOAD correction and some points to be considered in the execution. With the pro

8Figure 5. Sample Program for HP 4194A OPEN/SHORT/LOAD Correction