Instructions

82 T3VNA User Manual
Table 4-4 Velocity Factor
Parameter Explanation
Default 0.66
Range 0.1 - 1
Unit N/A
Knob Step 0.01
Direction Key Step In 1-2-5 sequence
4.1.6 Cable Atten
Set the attenuation factor of the cable-under-test. It is used to compensate the amplitude of peaks in
dierent positions. The DTF calculates the peaks by the final receiving data which has been attenuated
by the cable, thus the amplitude of peaks cannot show exactly where the mismatch position is. So the
cable atten is used to compensate by length.
Table 4-5 Cable Atten
Parameter Explanation
Default 0.00 dB/m
Range 0.00 dB/m - 5.00 dB/m
Unit dB/m
4.1.7 Window
Set the window function used in DTF.
The use of a non-rectangular window function can improve the side lobe effect of the analysis. The
vertical axis is more accurate, but the horizontal axis resolution is reduced.
In the sub-menu, the following three settings can be selected.
 O
 Rectangular
 Hamming
The default state is "Off"; this value is also displayed in the status bar on the left side of the screen.
Table 4-6 Window function properties
Win-type Expression Main lobe width
Rectangular
Hamming
4.1.8 Calibration
Set calibration related items. The calibration status is displayed in the upper left corner of the screen.
The calibration status and display are as follows: