DRAWING No. SE300 01-1408 2040 6006
[1] SAFETY PRECAUTIONS
Before use, read the following safety precautions.
Thank you for purchasing Digital Tachometer Model SE300.
Before use, please read this manual thoroughly. After reading it,
keep it together with the product for reference to it when necessary.
The instructions given under symbols “
WARNING” and
“ CAUTION” must be followed to prevent incidents such as an injury.
1-1
Explanation of Warning Symbols
The meaning of the symbols used in this manual is as follows.
: Very important instructions for safe use.
• The warning messages are intended to prevent accidents to
operating personnel such as an injury.
• The caution messages are intended to prevent damage or
malfunction to the instrument.
1-2 Warning Instructions for Safe Use
To prevent human incidents such as an injury, be sure to
observe the following instructions when using the instrument.
1. Before proceeding to measurement, wear optimum working
cap and wear so that your hair and clothes are not entangled
by the rotating object. Be also sure to wear protective eyeglasses.
2. Never touch the rotating object during measurement.
3. Do not use the instrument if the rotating object to be
measured presents any irregularity.
4. If there is any risk of endangerment of the measurement
personnel by a part of the rotating object, secure the safety
of that part by installing an enclosure, etc.
5. Do not service or modify the instrument unless when
replacing the batteries.
6. The instrument should be inspected in the start-up inspection
of every day as well as more than once a year.
WARNING
1. Take care not to drop the instrument from a high altitude
when handling it.
2. Take care not to apply a strong impact to the lens section of
the instrument.
3. Do not open the case of the instrument, touch the internal
circuit boards or parts or modify it in any manner.
CAUTION
[2] APPLICATIONS AND FEATURES
2-1 Applications
This instrument is a noncontact, handheld type digital tachometer
designed for measuring the rotation speeds of rotating objects such
as motors. The instrument can also be used as a contact type tachometer
by connecting the optional ENC-3 Contact Measurement Attachment.
2-2 Features
• Designed in pursuit of the ease of holding to enable stable
measurement.
• Abundant measurement modes.
• Long detection distance in noncontact measurement (max. approx.
50 cm) enabling measurement from a distance from the rotating object.
• Contact measurement capability using the optional ENC-3
Contact Measurement Attachment.
• MAX/MIN display function.
• Auto power OFF function (approx. 2 min., cancellation possible).
• Bright backlight.
• Fixed installation possible using a commercially available camera tripod.
[3] NAME OF COMPONENT UNITS
3-1 Main Instrument and Accessories
Irradiation/detection lens
Power button
Rotation detection
indicator LED
Front
Back
Contact adapter fixing hole
Tripod hole
Battery cover
Function buttons
See section [4]
3-2 Display
Numeric value display
Units
: Maximum value
: Auto power OFF
: Minimum value
: Contact measurement mode
: Data Hold
: Low battery alarm
For the units and their combinations, see “5-3 Noncontact
Measurement” and “5-4 Contact Measurement”.
[4] DESCRIPTION OF FUNCTIONS
4-1 Power button:
Press and hold the button for more than one second to turn the
instrument ON.
All of the display and indicators light up and then the instrument
gets ready for measurement.
* If there is a reflective object in front of the lens when the instrument
is turned ON, a numeric value may be displayed. In such a case,
wait for about 2 seconds until the numeric value becomes [0].
(Ready for measurement)
Press the same button for more than one second to turn the
instrument OFF.
The measurement mode setting is saved in memory even after the
instrument has been turned OFF.
4-2 Auto power OFF
When the instrument has not detected reflected light for about 2
minutes after the last operation performed, the instrument turns
OFF automatically. To recover from the auto power OFF status,
turn the instrument ON with the usual procedure.
To cancel the auto power OFF function, press and hold the
button and then hold the Power button for more than one second
to turn the instrument ON. The
indicator will not be displayed in
the measurement display.
4-3 Measurement mode selection:
button
Each press of the
button switches the measurement mode.
Press and hold the
button for more than one second. The
indicator appears indicating that the instrument is in the noncontact
measurement mode. To return to the contact measurement mode,
press and hold the
button for more than one second again.
* For details on the measurement mode switching of the noncontact
and contact measurement modes, see “5-3 Noncontact
Measurement” and “5-4 Contact Measurement”.
4-4 Backlight switching:
button
Press the
button to switch ON the backlight of the display
panel. Press the button again to switch the backlight OFF.
4-5 Data hold:
button
When the
button is pressed, the
indicator appears on
the display and the numeric value being displayed is held. The
displayed value will not change even when the measurement input
varies. When the button is pressed again, the
indicator
disappears and the data hold function is canceled.
* The data hold function is also canceled when the
button is
pressed.
4-6 Maximum and minimum value display:
button
Press the
button to enter the
mode in which the
instrument saves and stores the maximum and minimum measurement
values from the moment the button is pressed. Each press of the
button switches the displayed values in the following cycle:
• Maximum value display: The instrument displays the maximum
value since the press of the
button.
• Minimum value display: The instrument displays the minimum
value since the press of the
button.
• Current value display: The instrument displays the current
measurement value while saving the maximum and minimum
values since the press of the
button. To view the
maximum or minimum value, it is required to press the
button to the maximum or minimum value display.
To cancel the maximum and minimum value display, press and
hold the
button for more than one second.
* The maximum/minimum value display function is also canceled
when the
button is pressed.
* The
button is disabled during data hold (
). The
maximum and minimum values are not updated during it.
* Maximum and minimum value display function is disabled in the
count measurement mode.
4-7 Count clear:
button
Press the
button during count measurement (unit: count)
clears the counted value.
4-8 Low battery alarm
When the battery power is consumed and the voltage drops below
about 2.3 V, the
indicator appears on the display panel to
solicit early replacement of the batteries.
4-9 Tripod hole
The instrument can be installed on a
commercially available tripod for fixed
use. Screw in the tripod into the
threaded tripod hole on the rear of the
instrument.
• Thread size: 1/4-20 UNC (ISO 1222)
* Use a commercially available tripod.
[5] MEASURING PROCEDURE
5-1 Start-up inspection
Inspect the following points before starting the work of every day.
• Appearance: Check that the appearance of the instrument is not
damaged by falling, etc.
If any irregularity is found, do not use the instrument.
• Scratches and dirt on the lens: Check that the lens is not
clouded.
Accurate measurement is impossible if the lens is dirty or clouded.
Dirt or cloud should be removed by gently wiping with a soft, dry cloth.
• Check that the low battery alarm indicator
is not displayed
when the instrument is turned ON. If it is displayed, replace the
batteries with new ones.
* If nothing is displayed on the display panel, the batteries could be
exhausted completely.
5-2 Warning for measurement
1. Do not measure a rotating object from a close distance at
which the instrument could contact the rotating object.
2. Do not attempt to measure an object rotating at a speed
exceeding the measuring range of the instrument.
WARNING
5-3 Noncontact measurement
Be sure to stop the rotating object to be measured before
attaching the reflective sticker on it.
WARNING
1. Before attaching the reflective sticker on the rotating object,
remove the moisture, oil and dust on the sticker attaching
surface completely.
2. If the sticker is to be attached on a shiny plated surface,
accurate measurement would be impossible due to diffuse
reflections. In this case, paint the sticker attaching surface
black or attach a piece of black tape on the surface.
3. Protect the reflective sticker on the rotating object against
penetration of intermittent light such as the light from a
fluorescent lamp. If an effect of extraneous light is expected,
adjust the positioning of the instrument so that it displays [0]
when the rotating object is not rotating before measurement.
4. Accurate measurement may sometimes be impossible under
direct sunlight.
5. Measurement of high-speed rotation may be impossible of
the time the irradiated light passes on the reflective sticker is
short (less than about 0.2 second). In this case, increase the
area of the reflective sticker.
CAUTION
To perform noncontact measurement, attach the reflective sticker
(provided with the instrument) on the rotating object to be
measured as shown below.
Rotating object
Reflective sticker
Irradiation light
1) Turn the instrument ON and set the desired measurement mode.
Each press of the
button switches the measurement
mode in the following cycle:
Rotation speed measurement Rotation speed measurement
(revolutions per minute)
(revolutions per second)
Rotation count measurement
Interval measurement
(counts)
(milliseconds)
2) Apply the irradiation light perpendicularly on the reflection
marking on the rotating object so that the rotation detection
indicator LED lights steadily. The distance between the tip of the
detection section of the instrument and the reflective surface on
the rotating object should be between 50 and 500 mm.
3) The instrument displays the measurement result.
SE300
DIGITAL TACHOMETER
01-1408 2040 6006
INSTRUCTION MANUAL
Dempa Bldg, 4-4 Sotokanda 2-Chome
Chiyoda-ku, Tokyo, Japan
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