6-65
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 ( s ee
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,
If you performed: You can view:
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
Cal
ECal MENU
CONFIGURE [ ]
MODULE A b
CONFIDENCE CHECK
PARAMETER [ ]
PARAMETER [ ]
S11 1-PORT
S22 1-PORT
REFLECTION 1-PORT
S22/S12 ENH. RESP.
TRANS/REFL ENH. RESP.
FULL 2-PORT