RPM33-EU-EN V1.3 4/13
6
Taking
Measurements
Non
‐
Contact
(Photo)
Tachometer
Measurements
1.
Prepare
for
the
Non
‐
Contact
measurement
as
described
in
the
Measurement
Preparation
section
above.
2.
Use
the
MODE
button
(momentarily
presses)
to
select
RPM
(rotations
per
minute)
or
Hz
(Hertz:
rotations
per
second)
as
the
unit
of
measure.
3.
Press
and
hold
the
MEASURE
button
to
begin
a
measurement
session.
Hold
the
MEASURE
button
down
for
the
duration
of
the
test
and
release
it
to
end
the
session.
4.
Point
the
meter
toward
the
device
under
test
at
a
distance
of
2"
to
20"
(50
to
500mm).
Be
sure
to
align
the
laser
light
beam
with
the
reflective
tape
(see
diagram
above
in
previous
section).
5.
Verify
that
the
(
((
))
)
monitor
indicator
appears
on
the
LCD
when
the
reflective
tape
passes
through
the
light
beam.
6.
Read
the
measurement
result
from
the
LCD
display.
7.
When
the
MEASURE
button
is
released
the
last
reading
will
remain
on
the
display
for
5
to
10
seconds
before
the
‘Auto
Power
OFF’
feature
switches
the
meter
OFF.
The
HOLD
display
icon
will
switch
ON.
Non
‐
Contact
(Photo
tachometer)
Measurement
Considerations
Bright
ambient
light
may
interfere
with
the
reflected
light
beam.
Shading
the
target
area
may
be
necessary
in
some
cases.
The
non
‐
reflective
area
must
always
be
larger
than
the
reflective
area.
If
the
shaft
or
rotating
object
is
normally
reflective,
it
must
be
covered
with
black
tape
or
paint
before
the
reflective
tape
is
applied.
To
improve
repeatability
of
low
RPM
measurements,
apply
additional
squares
of
reflective
tape.
Divide
the
reading
shown
on
the
display
by
the
number
of
pieces
of
reflective
tape
squares
to
calculate
the
actual
RPM.
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