Specifications
Step 3. Press the Cal (top left) then the following soft keys in
sequence:
PERFORM 3 PORT CAL
CHANGE CAL METHOD
TRX
NEXT CAL STEP
NEXT CAL STEP
CHANGE PARAMETERS
NEXT CAL STEP
Step 4. Specify offset length for the reflective device, press
OFFSET LENGTH.
Step 5. Enter 5 mm, using the Data Entry keypad and
k/ms/mm key.
Step 6.
Press NEXT CAL STEP/START CAL.
Step 7. Continue the calibration sequence by following the
prompts as they appear.
Step 8. Press Save/Recall (bottom left.)
Step 9. Press the following soft keys in sequence:
SAVE
FRONT PANEL SETUP AND CAL DATA ON
HARD DISK
CREATE NEW FILE
Step 10. Specify a name using the front panel knob. When
complete, select DONE.
3-Port Calibration Method Details
The basic error model for two port calibrations consists of 12 error
coefficients that correct for non-idealities in the VNA test set. Both of
the three port calibrations discussed expand this set of coefficients to
24, which can be grouped as follows:
Basic two port cal 12 terms
Port 3 directivity and matches 3 terms
Port 3 tracking 5 terms
(to and from the other ports + reflection tracking)
Additional isolation terms 4 terms
The model illustrated in Figure 7-7 shows the error boxes that embody
the error terms. The isolation and transmission tracking terms (12 out
of the 24) involve paths between ports and are not shown directly in
the figure. The 12 other terms (source and load match, directivity, and
reflection tracking) are associated with each individual error box.
3-PORT TRANSMISSION MEASUREMENT
AND REFLECTION CALIBRATION CALIBRATION
7-24 MS462XX OM
Data Entry
Power
Keyboard
Port 3
Channels
Enhancement
Stimulus
System
Port 1
Port 2
Probe Power
1
8
5
2
9
6
3
-
.
G/ns/m
M/ s/cm
k/ms/mm
X1
Enter
Local
Appl
Meas
Marker
Hold
Ch 1
Ch 2
Ch 4
Ch 3
Freq
Sweep
Power
Config
Seq
Cal
Avg
Utility
Hard
Copy
Default
Save /
Recall
0
7
4
Display
Clr
Print
Soft
Keys
Save/
Recall
Data Entry
Power
Keyboard
Port 3
Channels
Enhancement
Stimulus
System
Port 1
Port 2
Probe Power
1
8
5
2
9
6
3
-
.
G/ns/m
M/ s/cm
k/ms/mm
X1
Enter
Local
Appl
Meas
Marker
Hold
Ch 1
Ch 2
Ch 4
Ch 3
Freq
Sweep
Power
Config
Seq
Cal
Avg
Utility
Hard
Copy
Default
Save /
Recall
0
7
4
Display
Clr
Print
Soft
Keys
Cal