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Calibrating for Increased Measurement Accuracy
Calibrating Using Electronic Calibration (ECal)
Investigating the Calibration Results Using the ECal Service Menu
CAUTION The confidence check described in the previous section displays the ECal data
of a single state. This confidence state is a calibrated standard not used
during ECal. It is provided to give an independent assessment of the quality
of a calibration. In the Ecal Service menu, you may also display each of the
calibration standards which are used during an ECal calibration, along with
the analyzer’s measurement of those standards.
You may notice a difference in measurement results when comparing ECal
confidence state data and ECal standard state data. This result may be
related to certain measurement errors with the network analyzer system,
which add uncertainty to measurement results. More detailed information
regarding measurement uncertainty is documented in the “Determining
System Measurement Uncertainties” chapter of the network analyzer's
reference guide. Additional information on improving your measurements
can be found in Chapter 5, “Optimizing Measurement Results.”
Using the ECal Service menu is not a standard part of the ECal procedure. It is a tool to
allow you to identify problems in the calibration equipment, cables, connectors, or
procedures.
The Confidence Check menu supports the comparison of the measured data versus the
module's premeasured calibration data for the confidence state. The ECal Service menu
supports the comparison of the measured data versus the module's premeasured
calibration data for the remainder of the module states, in addition to the confidence state.
Access the ECal Service menu by pressing from the Confidence Check
menu.
The ECal Service menu softkeys are:
Toggles the analyzer to show the data for the following calibration
states:
•CONF (Confidence)
•THRU
•ISOL (Isolation)
•S11 REFL (S11 Reflection)
•S22 REFL (S22 Reflection)
Toggles between the available S11 and S22 reflection states listed in
the softkey described above.
•S11 REFL allows up to 13 reflection states.
•S22 REFL allows up to 13 reflection states.
ECal SERVICE
ECal STD [ ]
REFL STD [ ]
ECal STD [ ]