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Calibrating for Increased Measurement Accuracy
Calibrating Using Electronic Calibration (ECal)
Perform the Confidence Check
The confidence check is a means of visually checking the quality of the calibration. The confidence check
displays the currently measured data (DATA trace) and the factory-premeasured data (MEM trace) for the
module’s confidence state. The confidence state, an independent reference standard, was not used for the
calibration. For a good calibration measurement, there should be no significant difference between the
traces (see
Figure 6-24).
To Perform the Confidence Check
NOTE A confidence check is only valid after an ECal has been performed.
1. Press .
2. Press until the correct module (A or B) is selected.
3. Select to display the confidence check and the ECal Confidence Menu.
4. Press until the S-parameter that you want to view is displayed.
Pressing the softkey toggles between the S11, S21, S12, and S22 (or for the ET
models, TRANS (transmission) and REFL (reflection)) calibration traces. The confidence check will only
display the S-parameter calibration data for which you calibrated. Uncalibrated S-parameter data traces
are invalid. The memory trace still displays the module’s factory-premeasured trace.
For example,
5. Press until the calibration confidence check trace that you want to view is
displayed.
Pressing the softkey toggles between the five trace-type display options. The
confidence check can display the measured ECal results (DATA) and the premeasured calibration data
(MEM) in following five ways.
If you performed: You c an vi ew :
A 1-port calibration
• (ES models)
• (ES models)
• (ET models)
Only one calibrated S-parameter
An enhanced response calibration
• (ES models)
• (ES models)
• (ET models)
Only two calibrated S-parameters, one at a
time
A full 2-port calibration
• (ES models)
All four calibrated S-parameters, one at a time
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