CAA-100 Series User’s manual
Shineway Technologies, Inc.
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35-
The user can modify the pre-defined cable parameters through PC software .
4.2.1 Set Distance parameter
Distance parameters need to satisfy the testing needs, but also associated with the following parameters
The operating frequency range (F1, F2)
The number of measured points (N)
Cable propagation velocity (Vp)
Once the user set the operating frequency, the number of measured points, cable propagation velocity, the
maximum allowed cable length (D
max
) has be decided.
1
2
1
*
*
8
^
10
*
150
*
max
F
F
Vp
N
D
For the convenience of users, the system will automatically display the relevant information (the maximum
allowed cable length: Dmax; resolution Δ D) in the upper right corner.
For example: N=551; Vp=0.85; F1=25MHz, F2=4000MHz. The corresponding Dmax is 17.64 meters, Δ D is
0.03 meters;
Do not change the frequency, if users want to increase the allowed cable length , can increase the number of
measuring points, the corresponding test time can also be longer
Due to the calculation of DTF, the minimum frequency interval is (N-1) *100kHz. If the measurement points is
551, corresponding minimum frequency interval is 55MHz.
The minimum distance interval is 1 meters (inch) or 1 feet (inch)
Start distance range is : 0~Max-1;stop distance range is 1~Dmax
4.2.2 Set Cable parameter
Users can manually input cable parameters (velocity; cable loss) or select the type of cable known.
the propagation velocity of electromagnetic wave in the cable is less than the vacuum speed (300M meters
/second). Propagation constant is 0.85, meaning that the actual propagation velocity of the electromagnetic wave
in the cable is the 0.85*300M meters / second.
When the user in the fault distance analysis, often want to know the return loss or VSWR of one exact
connector . At that position, the cable loss and connector return loss will be mixed together, systems need to
