Starrett 2000-24 Altissimo Electronic Height Gage - Manual (Page 11)

Measuring - TIR
Starrett Altissimo Operation Manual Page 10 CAT 2000-24
TIR: The TIR mode can be used to measure TIR of either the upper or lower surface of a part. Press the TIR Key to
the right of the Display to enter this mode.
The Display will request Scan 1 (Scn 1). Using the Coarse Adjuster Knob, bring the Probe close to the Surface to be
measured. Pull out the Adjusting Knob to engage the Fine Adjust mechanism and move the probe onto the surface
until the tool beeps. Slide the probe across the High or Low point of the Hole. Press the Hot Key to end the scan.
The display will show the TIR of the measured Surface. Press the Hot Key on the Base or the F5 Key on the Display
to switch the measured value between TIR, MAX and MIN. (See Figure 22) MAX is the distance from the Active
Datum to the Point furthest away. Min is the Distance from the Active Datum to the point closest. When either the
MAX or MIN are selected using the Hot Key, the F1 Key will allow setting the Active Datum to either feature.
Tip: When Measuring Surfaces it is helpful to set the Belt Locking Knob to drag a little on the belt. This will
prevent the probe from moving while scanning and eliminate the need to engage the Fine Adjust Knob.
Note: Retracting the probe from the surface will terminate the Scan, however, the most accurate results will be
achieved when the Hot Key is used to terminate the scan.
Tip: The TIR mode can be used to measure the high or low
point of a Diameter or other surface. The Datum can then
be set to the Max or Min Value. (See Figure 21)
Note: If the tool beeps three times before you end the Scan
you have exceeded the High or Low Limit of the Scanning
Range. (See Figure 23) Remeasure the surface. You can
monitor your position within the Scanning Range by
observing the Scanning Meter on the Left Side of the
Display Screen.
Tip: For quick measurements, the probe can be brought into contact with the surface to be measured by using the
Coarse Adjuster Knob. Try not to move the Knob while scanning the surface. After scanning the surface use the
Knob to retract the probe. This will provide slightly reduced accuracy but greatly speed up measurements.