Surface Speed Measurement; Memory Recall - Extech Instruments RPM40 User Manual

Contact RPM Measurement
1. Install a rotating attachment (cone or funnel) to the meter
2. Select Contact RPM measurement mode as described in the 'Selecting a function' section.
3. Press and hold the MEASURE button while simultaneously placing the RPM adapter (1)
against the center of the rotating axis to be measured.
4. Release the MEASURE button when the reading stabilizes (approximately 2 seconds).
Reversible LCD Display
The LCD display indicates Photo Tachometer measurements in one direction and Contact
measurements in the opposite direction. This permits the user to easily read the measurement
digits in both measurement modes.
Surface Speed Measurement
1. Select the Surface Speed (m/min, ft/min, or in/min) mode as described above in the
'Selecting a function' section.
2. Attach the Surface Speed wheel (2) to the meter.
3. Press the MEASURE button and place the surface speed wheel against the object under test.
4. Release the MEASURE button when the reading stabilizes (approximately 2 seconds).
Memory Recall
The minimum (dn), maximum (UP), and last (LA) reading values are stored in memory after each
measurement (after the MEASURE button is released). To view these values:
1. Press and hold the MEMORY button (9), the display will toggle between the stored reading
and its identification label (dn for lowest reading), UP for highest reading, or LA for last
reading).
2. Release the MEMORY button and then press and hold it again to view the next stored
reading.
3. Release the MEMORY button and then press and hold it again to view the next stored
reading.
4. Repeat these steps as desired.
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