HP HP 8753E, User Manual, Page: 355 / 699

Electrical Offset
Some standards have reference planes that are electrically offset from the mating plane of the
test port. These devices will show a phase shift with respect to frequency. 6-4 shows
which reference devices exhibit an electrical offset phase shift. The amount of phase shift can
be calculated with the formula:
(360
x f x where:
f = frequency
1 = electrical length of the offset
c speed of light (3 x meters/second)
Fringe Capacitance
All open circuit terminations exhibit a phase shift over frequency due to fringe capacitance.
Offset open circuits have increased phase shift because the offset acts as a small length of
transmission line. Refer to 6-4.
6-4. Calibration Standard Types and Expected Phase Shift
Port
Connector Type
Type-N male
male
female
male
female
Type-N female
Type-N female
N-male
male
Type
short
Offset Open
Expected
+
+
+
+
female
male
female
Type N-female
+ +
(360 x x I)
763 Type-N female
Application and Operation Concepts