ACU-RITE 300S READOUTS - Manual (Page 34)

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Set/Zero Soft Key Details
The SET/ZERO soft key is a key that determines the effect of pressing
an Axis key. This key is a toggle key, switching the functionality
between Set, and Zero. The current state is indicated in the Status Bar
shown as “SET” in this view.
When the state is Set, and the 300S is in Actual Value mode, selecting
an Axis key opens the Datum form for the selected axis. If the 300S
is in Distance-To-Go mode, a Preset form opens.
When the state is Zero, and the 300S is in Actual Value mode,
selecting an Axis key sets the current datum for that axis to zero, at
the current position. If it is in Distance-To-Go mode, the current
Distance-To-Go value is set to zero.
Calc Soft Key
300S’s calculator is capable of handling everything from simple
arithmetic to complex trigonometry and RPM calculations.
Press the CALC soft key to access the STANDARD/TRIG and RPM
soft keys. The CALC soft key is also available on input forms where
preforming calculations may be required while inputting data.
Trig functions contain all trig operators as well as, square and square
root. Whenever you're calculating the SIN, COS or TAN of an angle,
enter the angle first and then press the appropriate soft key.
If the 300S is in Actual Value mode and the state of
Set/Zero is zero, pressing any Axis key resets the current
datum to zero at the current location for that axis.
When you need to enter more than one calculation into a
numeric field, the calculator will perform multiplication and
division before it performs addition and subtraction. If you
were to enter 3 + 1 ÷ 8, 300S will divide one by eight, then
add three for an answer of 3.125.
Angle values use the current angle format selection of
decimal degrees, or radians.