Velleman DVM8090 Bedienungsanleitung Seite 7

7. Bac ckground inf
Working principle
The Infra Red sensor of th
and trans mitted by a surfa
converts t this information i
used for a aiming purposes.
Emissivit ty
Emissivity y describes the e
organic or r oxidized surface
Measuring g shiny or polishe
tape or pa aint to compensa
reach the surface tempera
When me asuring targets w
than the a actual temperatu
Surface t temperature
When goi ng from low tem
vice versa a, the IR sensor o
Distance e and spot size
The distan nce-to-spot ratio
spot size (measured area)
sensor an nd the target, e.g
target, th e Ø of the measu
target mu ust be larger than
This mean ns that for smalle
the target t. For best accura
as the spo ot size.
8. Mai intenance
• Wipe th he device regular
or solv ents. DO NOT su
9. Bat tteries
• To repl lace the batteries
• Open t he battery cover
the sen nsor).
• Take o ut the old batter
AAA ba atteries following
compa rtment.
• Slide th he battery cover
Do not punc
batteries in
attempt to r
Keep batter
21.01.2010
DVM809
formation
he unit detects en
ace. This energy
into a temperatu
nergy-emitting c
es have an emiss
ed surfaces will b
ate, allow sufficie
ature.
with ε < 0.95, the
ure of the surface
perature to high
of the thermome
of this thermom
) is approximatel
g. when the mete
ured area (spot s
n the spot size to
er targets, the th
acy, make sure t
rly with a moist,
ubmerge the dev
s, make sure the
r at the back by s
ies and replace t
the polarity mar
back in place.
cture or throw b
accordance wit
recharge non-re
ies away from
7
90
nergy that is emi
is focussed onto
re reading. The l
characteristics of
sivity of ±0.95.
be inaccurate. Us
ent time for the ta
e display temper
e.
temperature me
eter needs a few
meter is 2:1. This
y half the distanc
er is held at 10 cm
size) will be ±5cm
o ensure correct m
hermometer must
he target is at le
lint-free cloth. D
vice in any liquid.
device is switch
sliding it downwa
hem with 3 new
rkings inside the
batteries in fire
th local regulat
echargeable ba
children.
Rev. 0
tted, reflected
a detector that
laser beam is onl
materials. Most
se some masking
ape or paint to
rature is lower
easurements or
minutes to adjus
means that the
ce between the
m (±4") from the
m (±2"). The
measurement.
t be held closer t
east twice as larg
Do not use alcoho
.
ed off.
ards (away from
and identical 1.5
battery
e. Dispose of
tions. Do not
atteries.
©Velleman
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5V
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