Simplified Calibration; Simplified Full 3/4-Port Calibration - Agilent Technologies ENA Series User Manual

Calibration

Simplified calibration

Simplified calibration
The simplified calibration calculates the calibration coefficients by skipping part of thru
measurement (and line measurement for TRL measurement) that is necessary for the full
3/4-port calibration and the 3/4-port TRL calibration.

Simplified full 3/4-port calibration

In the simplified full 3/4-port calibration, since the calibration coefficients are calculated
while omitting part of the thru measurement data, the effect of errors when acquiring
calibration data becomes larger than in the normal full 3/4-port calibration. Therefore, you
must pay special attention to the following points when measuring data for the simplified
full 3/4-port calibration.
o The standard used for measurement must match its definition value.
o Realize high reliability and repeatability for measurement.
The types of thru measurement you can omit are determined by the ports you select. Some
types of thru measurement cannot be omitted. The table below shows the types of thru
measurement that can be omitted.
Table 4-2 Types of thru measurement that can be omitted for simplified full 3-port
calibration
Ports used
Ports 1, 2, 3
Ports 1, 2, 4
Ports 1, 3, 4
Ports 2, 3, 4
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• Use a standard that provides good repeatability (stability).
• Do not omit the length of the thru when defining the standard.
• When using a user-created standard, verify the definition value.
• For the N connector, note the discrimination between male and female.
• Reduce the difference in external environment (such as temperature difference)
between conditions of measuring calibration data and conditions of measuring
actual data.
• Set the power level of the stimulus signal to a value that does not generate
compression.
• Narrow the IF bandwidth.
• Increase the averaging factor.
• Use a cable whose change in amplitude/phase characteristics when bent is small.
• Use high-precision connectors.
Types of thru measurement that can be
omitted
2-3
2-4
1-4
2-4
Chapter 4