Starrett 2000-24 Altissimo Electronic Height Gage - Manual (Page 7)

Establishing a Datum
Starrett Altissimo Operation Manual Page 6 CAT 2000-24
Measure Datum – If the Datum Symbol is flashing in the upper left corner of the Display then a Datum will need to
be established. Using the Coarse Adjuster Knob bring the Probe in contact with the surface plate or other datum
surface until it Beeps. (See Figure 11) Move the Probe clear of the surface. Press the F1 key to set the Active Datum
to 0 at the last measured point. (See Figure 12)
Note: If the probe is not calibrated the Altissimo may be used in the Unidirectional Height mode. Simply take a
measurement in either direction, Press the F1 Key to set the Active Datum to 0. The tool will only measure in the
direction that the initial point is measured in. See Measuring Modes – Height Section.
If a Datum is already established, then select the appropriate Measurement Mode using the Keys to the right of the
Display. Any of the following measurements may be used to establish a Datum: Height, Center, Max or Min.
Measure the Datum and verify that the value in the Display is the value to be used for the Datum. If the Diameter or
TIR Measurement Mode is selected, it will be necessary to use the Hot Key on the Base or the F5 Key (

) on the
Display to change the Display Value to Center, Max or Min before a Datum can be stored.
Store Datum - Simply press the F1 Key while displaying any of the above measurements and the Active Datum will
be set to 0 at the Measured Feature.
Note: Two Datums (A and B) and a Preset (P) may be stored. The Active Datum appears as a letter (A, B or P) in
the Datum Symbol in the upper left corner of the display. The Active Datum may be changed at any time by
pressing the F2 Key (ABP).
Store Preset – If the Preset is active, a P will appear in the Datum Symbol in the upper left corner of the Display.
When the F1 Key is pressed the Preset Value will be displayed. The Preset Value may be changed at this time using
the F1 through F4 keys. After verifying that the preset value is correct press the F5 key and the Datum will be set to
the Preset Value at the Measured Feature.