Agilent Technologies 8753ET User Manual page 388

Operating Concepts
Measurement Calibration
Isolation, E , represents the part of the incident signal that appears at the receiver
XF
without actually passing through the test device. See
with the test set in the transmission configuration and with terminations installed at the
points where the test device will be connected. Since isolation can be lower than the noise
floor, it is best to increase averaging by at least a factor of four during the isolation portion
of the calibration. The
calibration sequence to resume after a change to the averaging factor.
If the leakage falls below the noise floor, it is best to increase averaging before calibration.
In this case, omitting isolation is better than measuring the isolation standards without
increasing the averaging factor.
Figure 7-37 Isolation E
Thus there are two sets of error terms, forward and reverse, with each set consisting of six
error terms, as follows:
• Directivity, E (forward) and E
DF
• Isolation, E and E
XF
• Source Match, E
SF
• Load Match, E
LF
• Transmission Tracking, E
• Reflection Tracking, E
The analyzer's test set can measure both the forward and reverse characteristics of the
test device without you having to manually remove and physically reverse the device. A
full two-port error model illustrated in
analyzer effectively removes both the forward and reverse error terms for transmission
and reflection measurements.
7-50
RESUME CAL SEQUENCE
XF
(reverse)
DR
XR
and E
SR
and E
LR
and E
TF TR
and E
RF RR
Figure
Figure 7-37. Isolation is measured
softkey under the
7-38. This illustration depicts how the
menu allows a
Cal