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 80). 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.

MAX

MIN

MAX

Figure 80 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 81):

- - 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.

Figure 81 Test fail indication

Limit Line Editing

		To access the limit line editing mode, use the following softkeys:

In the editing mode the limit table will appear in the lower part of the screen (See Figure 82). The limit table will be hidden when you quit the submenu.

Figure 82 Limit line table

		To add a new row in the table, click Add. The new row will appear below the highlighted one.
		To clear the entire table, use Clear Limit Table softkey.
		To save the table into .lim file, use Save Limit Table* softkey.
		To open the table from a .lim file, use Restore Limit Table* softkey.

Navigating in the table to enter the values of the following parameters of a limit test segment:

Type		Select the segment type among the following:
Begin Stimulus		Stimulus value in the beginning point of the segment.
End Stimulus		Stimulus value in the ending point of the segment.
Begin Response		Response value in the beginning point of the segment.
End Response		Response value in the ending point of the segment.

Limit Test Enabling/Disabling

		To enable/disable limit test function, use the following softkeys:

Limit Test Display Management

		To enable/disable display of a limit line, use the following softkeys:
		To enable/disable display of Fail sign in the center of the graph, use Fail Sign softkey.

Limit Line Offset

Limit line offset function allows the user to shift the segments of the limit line by the specified value along X and Y axes simultaneously.

		To define the limit line offset along X-axis, use the following softkeys:
		To define the limit line offset along Y-axis, use the following softkeys: