HP 8712C User Manual

Compensating for Phase Shift in Measurement
Setups
Port Extensions
The port extension feature is used to compensate for the phase shift caused
by the insertion of cables, adapters, and lktures into the measurement path.
Port extension is particularly useful if you are unable to perform a calibration
directly at your DUT. See Figure 5-2 for this discussion. For example, you
might have a test fixture with type-N connectors, where you can easily
perform an accurate calibration. However, calibrating at this connector does
not remove the electrical length within the fixture. The desired calibration
reference plane is on the other side of the test fixture where you may have
device specik connectors. Port extension lets you compensate for this delay
within your fixture, thereby removing the phase shift that it causes.
NETWORK ANALYZER
WJ
REFLECTION
I I
TRI
RF OUT
RF
\NSM I
IN
SSION
po675b
Figure 5-2. Compensating for Test Fixture Delay
5-19

HP 8712C Specifications

General

Brand	HP
Model	8712C
Category	Measuring Instruments
Language	English