R3765/67G Series Network Analyzer Operation Manual
7.5 Calibration
7-32
(2) For measuring reflection
An open standard or a short standard can be selected for the calibration standard. The fre-
quency characteristics is calibrated in the reflection measurement by connecting the cali-
bration standard.
Both the open standard and short standard are full reflection and the phase for the short
standard is shifted by 180 °.
For the open standard, make sure that the reflection measurement port is actually made
open.
For example, the calibration can be made when the measurement port is open (unloading
condition) without the open standard for a calibrated N type connector.
However, if the open capacity is uncertain or if the open condition cannot be obtained be-
cause the measurement port is the line on the base board, the short standard should be
used or the calibration should be made with the line made short.
7.5.2 Normalize & Isolation Calibration
In the measurement of the transmission characteristic, calibrate the frequency characteristics
and the isolation.
The crosstalk from the signal source of the R3765/67G series to the receiver section and the
change for the worse of isolation caused by the jig connected between the test ports can be cal-
ibrated easily to enlarge the dynamic range.
• The frequency characteristic containing the cable and the connecter is calibrated by
connecting the through standards.
• The crosstalk characteristic is calibrated by connecting the load standard to the test port for
the isolation characteristic.
Also the isolation of the jig for measurement can be calibrated as well.
7.5.3 1-Port Full Calibration
Calibrates the directivity, source match, and frequency tracking in the reflection measurement.
This method highly accurately measures the reflection of a one port device or a two port device
whose one end is terminated.
(1) Three kinds of calibration standards are required as follows:
• Open standard
• Short standard
• Load standard
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