Keysight Truevolt Series Operating And Service Manual page 118

Features and Functions
Specifying the Digit Masking
The Digit Mask softkey specifies the number of digits shown.
For example, the following image shows 6½ digits.
In contrast, this image shows 4½ digits.
The Auto softkey specifies that the number of digits displayed is based on other function-specific settings,
such as the measurement aperture, set in NPLCs. Measurements are always rounded, never truncated.
Keysight True volt Series Operating and Service Guide 119