461995 Datasheet, PDF (6/6 Pages) Extech Instruments Corporation. – Laser Photo / Contact Tachometer

Contact Tachometer RPM Measurements
1. Move the Function switch to the CONTACT position.
2. Press the Measure button while lightly pressing the rotating ring against the center
opening of a rotating shaft.
3. Release the Measure button when the display stabilizes (approx. 2 seconds).
Linear Surface Speed (ft/min or m/min) Measurements
1. Slide the Function Switch to "SURFACE SPEED ft/min" or "m/min" position.
2. Install the surface speed attachment on the meter rotating ring.
3. Press the Measure button and hold the surface speed wheel against the device
being measured.
4. Release the Measure button when the display stabilizes (approx. 2 seconds).
MIN/MAX and Last Reading Memory Recall
The 461995 can record Maximum, Minimum, and Last Reading for the period of time the
Measure button is held. These stored values can then be read directly on the meter's
display. The memory will automatically clear after approximately 10 seconds of meter
inactivity. Access the memory data immediately after the measurements have been taken
as follows:
1. Press the Memory key once and hold it down: The Last Reading is displayed
followed by the "LA" icon.
2. Press again and hold: The Maximum value is displayed followed by the "UP" icon
3. Press again and hold: The Minimum value is displayed followed by the "dn" icon
Battery Replacement
The low battery indication appears as "LO" on the display. To replace the batteries, slide
the rear battery compartment cover off of the meter, replace the four 1.5V AA batteries,
and replace cover.
Calibration and Repair Services
Extech offers complete repair and calibration services for all of the products we sell.
For periodic calibration, NIST certification or repair of any Extech product, call customer
service for details on services available. Extech recommends that calibration be performed
on an annual basis to ensure calibration integrity.
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461995 V1.3 7/02