Unknown Thru Calibration; Procedure - Agilent Technologies ENA Series User Manual

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Unknown Thru Calibration

Unknown Thru Calibration is the preferred THRU methord of calibrating the

E5070B/E5071B to measure a non-insertable device. The major benefits of using a

unknown thru calibration are :

It is easy to perform.

Provides better accuracy than defined thru and is usually better than adapter removal.

Dose not relies on existing standard definitions that may no longer be accurate.

Causes minimal cable movement if the Thru standard has the same footprint as the

DUT. In fact, the DUT can often be treated as the Thru standard.

The thru must satisfy the following requirements:

1. Thru must be reciprocal (with S21 and S12 equal) in nature. It should have a consistent

behavior, independent of the direction from which it is used.

2. The electrical length of the thru should be known at an accuracy of ± 1/4 of

Unknown Thru is NOT supported during a TRL calibration.

The s-parameter of a thru can be determined when the following data is available:

1. Open, Short and Load measurement.

2. Actual, values derived from the calibration kit definitions.

To perform the Unknown Thru Calibration, follow the given procedure.

Procedure to select and define the name of the calibration kit

Step 1. Press

Step 2. Press

Step 3. Select desired calibration kit. (e.g. 85033D or user kit)

Step 4. Press

Step 5. Press

Step 6. Press

Step 7. Press

Step 8. Type a name for unknown thru calibration standard. (e.g. Unknown Thru)

By changing the label to a different name (e.g. Unknown Thru1), the "No Name" standard

will adopt the specified new name.

Modify CalKIt

Unknown Thru Calibration

E5070b E5071b