6 MEASUREMENT DATA ANALYSIS
207
6.7 Limit Test
The limit test is a function of automatic pass/fail judgment for the trace of the
measurement result. The judgment is based on the comparison of the trace to the limit
line set by the user.
The limit line can consist of one or several segments (See figure 6.15). Each segment
checks the measurement value for failing whether upper or lower limit. The limit line
segment is defined by specifying the coordinates of the beginning (X0, Y0) and the end
(X1, Y1) of the segment, and type of the limit. The MAX or MIN limit types check if the
trace falls outside of the upper or lower limit respectively.
Figure 6.15 Limit line
The limit line is set by the user in the limit table. Each row in the table describes one
segment of the line. Limit table editing is described below. The table can be saved into a
*.lim file.
The display of the limit lines on the screen can be turned on/off independently of the
status of the limit test function.
The result of the limit test is indicated in the upper right corner of the graph. If the
measurement result passed the limit test, you will see the trace number and the result:
Tr1: Pass.
If the measurement result failed, the result will be indicated in the following ways (See
figure 6.16):
§Tr1: Fail will be displayed in upper right corner of the graph;
§Fail sign will be displayed in red in the center of the window;
§The points of the trace, which failed the test will be highlighted in red;
§You will hear a beep.
Fail sign and the beep can be disabled by the user. For beep deactivation see section 8.5.
MIN
MAX
MAX
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