Ripple Limit Test

Ripple limit test is an automatic pass/fail check of the measured trace data. The trace is checked against the maximum ripple value (ripple limit)defined by the user. The ripple value is the difference between the maximum and minimum response of the trace in the trace frequency band.

The ripple limit can include one or more segments (See Figure 83). Each segment provides the ripple limit for the specific frequency band. A segment is set by the frequency band and the ripple limit value.

Band 3

2 dB

Band 2

1 dB

Band 1

2 dB

Figure 83 Ripple limits

The ripple limit settings are performed in the ripple limit table. Each row of the table describes the frequency band the ripple limit value. The ripple 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 by the user.

The result of the ripple 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: Ripl1: Pass.

If the measurement result failed, the result will be indicated in the following ways (See Figure 84):

- - Ripl1: Fail will be displayed in upper right corner of the graph;
  - Fail sign will be displayed in red in the center of the window;
  - You will hear a beep.

Fail sign and the beep can be disabled by the user. For beep deactivation see section 8.5.

Figure 84 Test fail indication

The display of the ripple value can be enabled/disabled by the user in the ripple limit test status line in the upper right corner of the graph (See Figure 85). The ripple value is displayed for the band selected by the user. The ripple value can be represented as an absolute value or as a margin to the limit.

Figure 85 Ripple limit test status line

Ripple Limit Editing

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

In the editing mode the limit table will appear in the lower part of the screen (See Figure 86). The limit table will be hidden when you quit the submenu.

Figure 86 Ripple limit 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 Ripple Limit Table softkey.
		To save the table into .rlm file, use Save Ripple Limit Table* softkey.
		To open the table from a .rlm file, use Recall Ripple Limit Table* softkey.

Navigating in the table to enter the values of the following parameters of a ripple 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.
Ripple Limit		Ripple limit value.

Ripple Limit Enabling/Disabling

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

Ripple Limit Test Display Management

		To enable/disable display of the ripple limit line, use the following softkeys:
		To enable/disable display of the Fail sign in the center of the graph, use the following softkeys:
		To enable/disable display of the ripple value, use the following softkeys:
		To enter the number of the band, whose ripple value should be displayed, use the following softkeys: