R3765/67G Series Network Analyzer Operation Manual
7.5 Calibration
7-47
7.5.9
Extending Measurement Reference Plane
Is the function which moves the calibration plane to the end of the cable when the extension ca-
ble is connected to the test port after calibration. The function calibrates the addition of the elec-
trical length, assuming that the cable having no loss completely has been added. That is, it
obtains the phase characteristics only for a sample by calibrating the phase shift for the addition.
•
Electrical length correction
Corrects the electrical length which has been set to the measurement data. The
measurement port type is not identified. It can be used not only for correction but also
measuring the electrical length of the cable. Also, it can be used to measure flatness of the
phase by removing phase change due to the electrical length of the actual sample.
•
Port extension
Measurement is made, assuming that the extension cable with the electrical length already
set is connected to the measurement port. That is, the electrical length already set is
automatically corrected according to the change of the measurement port. For example, if a
correction value 10ns is set to the port 1 and a value 20ns is set to the port 2 when S
parameter test-set is used, the correction is automatically made as follows:
For S
11
measurement: (PORT 1)
2=20ns
For S
21
measurement: (PORT 1)+(PORT 2)=30ns
•
Phase offset
This function does not correct the electrical length. It adds a constant phase value as an
offset regardless of the frequency.
•
Phase slope
This function corrects and displays slope of the data measured by phase measurement.
The phase of the stop frequency is corrected by an input value with reference to the phase
of the start frequency.
•
Velocity factor (V
f
)
Sets the transfer constant value to be used to calculate the electrical length. The initial
setting is V
f
=1.
V
f
:
Velocity factor
L
:
Electrical length (distance)
c
:
Light speed
S
:
Electrical length (time)
f
:
Frequency
ε
R
:
Relative permittivity
V
f
=
(
ε
R
)
1/2
1
•
Phase offset value/correction value
Φ
(deg) =
L
c
1
V
f
f
= S
360
f
360
