Velleman DVM8030 Bedienungsanleitung Seite 5

5. Preparation
 Prior to using the tachometer, a piece of reflecting marker (incl.) must
be attached to the rotating device. Make sure the rotating device has
come to a full stop before touching it.
 Make sure the measuring area is clean, free of oil and dust.
 Cut one piece of the reflective marker and attach it to the rotating
device. Measurement can be done on the side or at the top of a rotating
shaft. When measuring at the top, do not attach the marker to close to
the centre. The size of the marker depends largely on the size of the
rotating device, but it should never cover more than half of the
circumference.
Notes
 in case no reflective marker can be attached, check whether a
measurement can be performed without. If the rotating device consists
of multiple reflective surfaces (e.g. fan blades), enter the number (see
§6: Use).
 Do not attach more than one marker to the same surface.
6. Use
Refer to the illustrations on pages 2 and 3 of this manual.
 Remove the sensor cover [1] by releasing the screw at the back of the
device and sliding the cover upwards.
 Press the
automatically after ±2 minutes of inactivity.
 Press the Unit button to switch from rpm (rotations per minute) to rps
(rotations per second) and back.
 Press and hold the Unit button for ±2s to switch on the backlight. Press
and hold again for ±2s to switch it off.
 Press and hold the
beam. Switch on the rotating device and aim the beam at the reflective
marker. To avoid multiple reflections, do not aim the beam
perpendicular to the marker but under an angle of ±30°. Best
measuring distance is between 10 and 40cm (4" ~ 15").
Note: When the display shows OL, the measured value is outside of the
measuring range (see §10: technical specifications)
 Release the
 When the
 Press the Func. button to show the maximum measured value of the
previous session [B].
 Press the Func. button again to show the minimum measured value of
the previous session [C].
V. 02 – 27/06/2013
-button to switch the device on. The device will switch off
-button. The sensor [2] produces a red laser-
-button to end the measuring session.
-button is not pressed the device is in hold-mode [A].
DVM8030
5 ©Velleman nv