Fieldpiece Fieldpiece SRMP2 Manual

Fieldpiece

Laser Digital
Tachometer
Model: SRPM2

OPERATOR’S MANUAL

Description

SRPM2 is a portable standalone digital, laser
tachometer. Point the laser at a fan blade or motor
shaft and the RPM shows up immediately on the
LCD.

Operation

SRPM2 works by reading reflected light from the
laser. Each time the reflection is interrupted, a count
is taken. Place a small piece of the supplied reflec­tive strips on the target to make sure the laser is
being reflected directly back to the instrument.

1. Press and hold ON for 1 second to turn on

SRPM2.

2. Press Mode to toggle between RPM (revolu-

tions per minute) and total count (total amount

of revolutions).

3. Press TEST once to turn on laser and start

testing. Steadily aim meter so that laser hits the

reflective strip.

4. Press TEST again to turn off laser and stop test-

ing.

5. Press Mem after taking RPM readings to cycle

through that set of reading’s Max, Min, and Last.

A new set begins each time you press TEST.

6. Quickly tap ON once to power down, or wait 25

seconds for auto-off.

Reflective strips

SRPM2 requires a reflection of it’s laser to work.
Proper use of reflective strips is critical to get accu­rate readings. To sense the reflected light, the
reflective strip must be big enough, you must aim
the laser accurately enough, and you must be close
enough. Typically a reflective square 0.5” on a side
read at under 4 feet works well. Care must be taken
so that light doesn’t reflect from either the surface of
the target (other than the reflective strip) or from the
background or foreground. For example, the fan
blades of a fan running in front of a reflective back­ground could cause multiple counts per revolution,
multiplying the actual RPM.

If you find your measurement unstable or a mul­tiple of what you think it should be, you may be
“seeing” extra reflections of the laser.

The reflector strip is designed to reflect the laser
light back to the instrument, irrespective of the inci­dent angle of the light. Therefore, to minimize extra
reflections from the target or fan blades, don’t point
the laser perpendicular to the reflective strip. This
will help deflect unwanted reflections from fan
blades or shaft away from the SRPM2 sensor (see
diagram).

A screen in front of the target can cause prob­lems by reflecting the laser light directly back to the
laser, thus interfering with the laser light reflected
from the reflector.

Additional reflective strips (3pcs, 6” x 0.6”) are

available, model RREF16.

Only apply one small piece of a strip and don’t
place one on each blade of the fan. If you do, and
there are three blades, you’re readings will be three
times the correct reading. When working with a very
reflective surface, try to find a place that isn’t reflec­tive (e.g. the shaft) and place the strip there. You
may need to wrap unglossy tape around the shaft
and place the reflective strip on the tape to elimi­nate unwanted reflections .

Specifications

Autorange: 1.5 rpm to 99999 rpm,

0 to 99999 counts

Resolution: (at 75ºF ambient) 0.1rpm, 1count
Accuracy: ±(0.03%+3digit)
Laser power: less than or equal to 2mW
Battery: 1.5V(AAA) x 3 (installed)
Battery life: 35 hours (operating), 1 year (off)
Auto-off: 25 seconds without use.
Operating temp: -0.4ºF to 104ºF
Base time: 12MHz
Display: 13mm 5digits LCD
Suggested distance from target: less than 40

inches when using 0.5” x 0.5” strip

Accessories: 2 reflective strips, batteries

(installed), ANC2 carrying case, operator’s
manual.

E.E.E.E.E displayed

If “E.E.E.E.E” is shown on the display, the meas­urement is invalid. You will need to restart the
SRPM2 and retest.

Warranty

The product is warranted to the original purchas­er against defects in material or workmanship for a
period of one (1) year from the date of purchase.
During the warranty period, Fieldpiece Instruments
will, at its option, replace or repair the defective unit.

This warranty does not apply to defects resulting
from abuse, neglect, accident, unauthorized repair,
alteration, or unreasonable use of the instrument.
Any implied warranty arising out of the sale of
Fieldpiece's products including but not limited to
implied warranties of merchantability , and fitness for
purpose, are limited to the above. Fieldpiece shall
not be liable for incidental or consequential dam­ages.

Service

Return any defective SRPM2 to Fieldpiece for
warranty service along with proof of purchase.
Contact Fieldpiece for out of warranty repair
charges.

WARNINGS

Never shine the laser at your eye.

Significant eye damage may occur.

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Strip

Shaft

Visit us at www.TestEquipmentDepot.com

99 Washington Street
Melrose, MA 02176

Phone [phone]
Toll Free 1-800-517-8431

Laser Digital Tachometer

Mode MemON

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SRPM2

Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176

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