As with base axes, several items can be assigned to a value axis.

Miscellaneous, type

In the sections Miscellaneous and Type, you enter the name of the axis, define the type of display, visibility and notation (auto, standard or scientific).

If an item has not been assigned to a value axis, the axis will not be displayed.

Label indicates the label of the X-axis and will be shown as first value in square brackets. Here you can use the unit indicated in the I/O Manager of each signal or a customized text.

Since negative numbers are always preceded by the minus sign, you can use the Format positive numbers to determine whether positive numbers should also display the plus sign or a space for the same number of digits.

With Force precision you can specify the number of decimals for the display.

Scaling

The value axis offers several scaling possibilities as e.g. auto scale, auto scale only with enlarged ranges or manual scaling which range has to be defined here.

Unlike the base axis, the value axis can be enlarged and shifted. The value axis can be shifted upward or downward with the mouse button pressed; the scrolling of the mouse causes the zooming in/out of the value axis to the point where the marker is situated.

If you move the mouse over the upper range of the value axis, pop-up buttons will appear which can be used for scaling the value axis as well.

The two outer arrows bisect or duplicate the scale range, the two inner arrows zoom in and out with a smaller factor. The middle point causes auto-scaling of the axis.

If you remove a value axis via the context menu of the axis, all items assigned to this value axis will be assigned to the next available value axis.

Color

There are different possibilities to define the color of the value axis:

• The foreground color refers to the foreground color chosen in the dialog Visuals of the chart settings.

• The color of the item with the lowest draw order refers to the configured color of the item assigned to this value axis and placed on the lowest draw order.

• If you prefer other colors, you can choose another color from the list of customized colors.

Zero value

With the option Label of zero line, it is possible that the label of the zero line is defined by a signal. This is recommended when the deviation from a reference value shall be measured for example. Enable the option Label of zero line and enter a static value or choose a signal. Then the signal value will be displayed on the zero line. You can also select a color for the zero line.