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Compatible Mode Calibrations
Because CAT, NA, and VVM modes are very similar, a 1-port or 2-port calibration
that is performed in one mode can automatically be applied in the other modes.
This occurs ONLY when modes have the same frequency data points as those
that were calibrated, and have the same Power (High or Low) and IF BW. CAT
and VVM mode IF BW is 30 kHz and is NOT selectable.
Compatible 1-port and 2-port Calibrations
Typically, a 1-port calibration and a 2-port normalization can NOT be maintained
at the same time. The most recently performed calibration will usually overwrite
the other.
In CAT mode, the 1-port measurement is Return Loss or DTF, and the 2-port
In NA mode, the 1-port measurement is S11, and the 2-port measurement is
However, a 1-port calibration CAN coexist with a 2-port normalization ONLY
when BOTH of the following conditions occur:
1. A 1-port Cal already exists, then a Normalization Cal is performed. They can
2. The Frequency Range, Resolution, Power (Hi/Low), and IF BW (in NA Mode)
When both conditions occur, you can switch between the 1-port and the 2-port
measurements, and both will remain fully calibrated.
In a DTF measurement, the frequency range over which the calibration is made
can be viewed using the calculated Start and Stop Frequency on the Settings
page. Learn how to see this on page 35.
Save the Calibration
After performing any type of calibration, you can save the FieldFox settings
along with the calibration into a STATE (*.sta) file. These settings and calibration
can then be recalled as necessary. To learn how, see Saving and Recalling Files
on page 134.
Verifying Calibration and Jumper Cable Integrity
After calibrating, it is important to verify that the calibration is good. When using
a jumper cable, also verify that the cable is of high quality.
Verify a Calibration
Connect a LOAD standard at the calibration reference plane (where calibration
In CAT Mode, select a Return Loss measurement.
In NA Mode, select a S11 Reflection with Log Mag format.
Observe the trace on the FieldFox screen:
Calibration for CAT, NA, and VVM Modes
measurement is Insertion Loss.
S21.
NOT be performed in the reverse order.
settings of the two calibrations are identical.
standards were connected). This may be at the end of the jumper cable or at
FieldFox RF OUT connector.
55
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