Omron NT31 NT31C manual System Menu shown below, Select Maintenance Mode

Memory Initialization		Section 6-4
	Initialize the display history record data by following the menu operation from the
	System Menu shown below.
	Ver 3.10	Select Maintenance Mode.

Select Memory Init..

Select Display History.

Select Yes.

The display history record data is initialized. During initialization, the message Initializing is displayed.

If No is selected, the NT31/NT31C returns to the MEMORY INIT. MENU screen without initializing the display history record data.

On completion of display history record data initialization, the message Finished is displayed and the NT31/NT31C returns to the MEMORY INIT. MENU screen.

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