Background Information - Velleman DVM8861 Mode D'emploi

4 Set value upper limit
5 Enable alarm lower limit
6 Set value lower limit
 To switch between measurements in °C and °F, open the battery cover (7). Just
below the measurement trigger (6), a small switch is located. Move this switch
gently to the left (for °F reading) or right (for °C reading) without touching any
other internal parts of the thermometer. Close the battery cover (7). The setting is
shown in the display (F).
 Hold the meter by the handle grip (8) and point the IR sensor (1) towards the
surface of which the temperature needs to be measured.
 Pull and hold the measurement trigger (6). The display (2) lights up and shows
the current temperature (I) and the maximum temperature (H).
 During measurement, the word 'SCAN' is visible in the LED display. When the
measurement stops, the word 'HOLD' is shown. The last measured value will
remain on the display until the measurement trigger (6) is pulled again, or when
the thermometer powers-off automatically (after ± 7 seconds).
 The maximum measured value of the current measurement is always shown in
the display (H).
 When a preset alarm limit is exceeded, an audible alarm signal will be produced,
and the according alarm icon in the display (D) will flash.
 When the lock mode is enabled a small icon is shown in the display (C). The
thermometer will continuously measure the temperature until the measurement
trigger (6) is pulled a second time.
 During lock measurement, the emissivity can be changed with the up (3) and
down (4) button.
 Push the down button (4) once to switch on the backlight. Push again to switch it
off.
 Push the up button (3) once to switch on the laser beam. Push again to switch it
off. The laser beam is only an aiming aid, be careful when using it. Refer to the
safety instructions.
Notes:
 The unit will not measure correctly through transparent surfaces (e.g. glass), as it
will measure the surface temperature of the transparent surface.
 Steam, dust, smoke etc. will have a negative impact on the measurements
accuracy.
 Measurements on shiny and/or polished surfaces will be inaccurate.
7.

Background information

Working principle
The Infra Red sensor of the unit detects energy that is emitted, reflected and
transmitted by a surface. This energy is focussed onto a detector that converts this
information into a temperature reading. The laser beam is only used for aiming
purposes.
Ambient temperature
The thermometer automatically compensates ambient temperature conditions.
Allow the thermometer to stabilise to ambient temperature for at least 30 minutes
for accurate measurements.
V. 04 – 08/07/2014
DVM8861
-50~+550°C (-58~+1022°F)
on / off
-50~+550°C (-58~+1022°F)
6 ©Velleman nv