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5.6.
Limit
Limit function is available only for the measurement formats of return loss, DTF, cable loss and phase, and the sweep mode of linear
sweep.
Limit test function can visually show whether the measured data exceeds the amplitude range represented by limit lines. Joined by
multi-segments, limit line is edited via editing the limit value. If there is no data point exceeding the position limit value, then the limit test
passes and the limit line is in green; as long as there is a data point exceeding the value, then the test fails and the limit line is in red.
Turn the alarm function on to make beeps to warn the operators when the limit test fails.
5.6.1.
Limit line
Editing of limit line is achieved by increasing the limit point, and adjusting the frequency and amplitude of limit point. The limit point can
only be edited under activated state, and the current activated limit points are shown as open circles in the limit line, while inactivated
ones as solid circles. Specific editing may follow the steps as follows:
1) Press
【
Limit
】
key to enter limit menu bar;
2) Click the touch screen [Mode Up Low] menu to select the type of edited limit line upper or lower limit line;
3) Click the touch screen [Edit] menu to enter Limit Line Edit menu bar. If there is no limit point at the present, add a limit point with
value of 0 respectively to the start and stop frequencies, and the limit switch is automatically open;
4) Click the touch screen [Add Point] menu to add the limit point, which is the midpoint between the current activated point and
adjacent limit point at right side;
5) Click the touch screen [Freq] menu to adjust the frequency of the current activated point;
6) Click the touch screen [Value] menu to adjust the amplitude of the current activated point;
7) Click the touch screen [Sel Point] menu, the activated limit point is represented by a hollow circle; it may also input the serial
number before press
【
Enter
】
to activate the corresponding limit point; and also click again on [Limit Point] to switch to the next
limit point at the right side of the limit point;
8) Repeat the above steps to edit and complete editing the limit line, as shown in the below figure:
Figure 5-10 Edit Limit Line
5.6.2.
Turn on limit test
Press
【
Limit
】
key and click the touch screen [Alarm Off On] menu to open or close the alarm function.
