Manual
M7LL
/
M70LL
Laser
‐
Sensors
HB
‐
M7LL
‐
M70LL
‐
E.doc
page
7
of
23
V20130301
MEL
Mikroelektronik
GmbH,
Breslauer
Str.
2,
85386
Eching
/
Germany
www.MELSensor.com
A
A
m
m
b
b
i
i
e
e
n
n
t
t
l
l
i
i
g
g
h
h
t
t
Ambient
light
up
to
5.000
LUX
does
not
cause
errors,
up
to
20.000
LUX
small
measurement
error
may
occur.
This
corresponds
to
average
sunlight
on
a
white
surface.
N
N
o
o
i
i
s
s
e
e
Noise
is
limiting
the
resolution
of
the
sensor.
It
is
depending
from
the
reflectivity
of
the
surface.
With
good
diffuse
reflection,
the
value
with
fastest
filter
settings
is
measured
as
follows:
M7LL
(10
kHz):
approx.
15…20
mV
M70LL
(100kHz):
approx.
30...40
mV
Measurement accuracy and adjustments
S
S
e
e
n
n
s
s
o
o
r
r
T
T
e
e
s
s
t
t
R
R
e
e
p
p
o
o
r
r
t
t
With
each
sensor,
a
detailled
test
report
is
delivered.
The
report
sheet
shows
the
relative
sensor
output
error
to
the
calculated
distance.
The
relative
error
is
the
deviation
from
the
straight
line
which
is
made
by
two
points
at
±
40%
of
the
range.
For
better
visualisation,
the
measurement
error
is
magnified
40
times.
The
absolute
error
is
the
deviation
from
the
calculated
distance.
It
is
shown
in
a
table
on
the
right
side
of
the
report.
L
L
i
i
n
n
e
e
a
a
r
r
i
i
s
s
a
a
t
t
i
i
o
o
n
n
The
sensing
element
(PSD)
does
not
give
results
which
are
in
a
linear
relation
to
the
distance.
Therefore
the
electronic
system
linearises
the
output
signal.
The
linearization
compensates
different
surface
reflectivity
and
creates
a
output
voltage
proportional
to
the
distance.
R
R
e
e
a
a
c
c
t
t
i
i
o
o
n
n
t
t
i
i
m
m
e
e
a
a
n
n
d
d
f
f
r
r
e
e
q
q
u
u
e
e
n
n
c
c
y
y
r
r
e
e
s
s
p
p
o
o
n
n
s
s
e
e
Reaction
time
at
analog
outputs
is
extremely
fast
with
laser
sensors.
It
is
specified
to
be
less
than
50
μ
sec
for
the
M7LL
or
5
μ
sec
for
the
M70LL
(rise
from
0
to
90%
of
final
value).
With
DIP
‐
switches
in
the
electronic
unit
the
integration
time
can
be
set
higher.
This
reduces
noise
and
improves
accuracy.
Please
find
details
on
page
Fehler!
Textmarke
nicht
definiert.
.
A
A
d
d
j
j
u
u
s
s
t
t
a
a
b
b
l
l
e
e
t
t
h
h
r
r
e
e
s
s
h
h
o
o
l
l
d
d
s
s
f
f
o
o
r
r
t
t
h
h
e
e
M
M
i
i
n
n
a
a
n
n
d
d
M
M
a
a
x
x
O
O
u
u
t
t
p
p
u
u
t
t
s
s
The
electronic
unit
has
two
ouputs
with
adjustable
thresholds
for
minimum
and
maximum.
The
thresholds
can
be
set
with
the
MEL
demo
software
for
M7LL
over
the
whole
range
of
the
sensor.
In
order
to
avoid
oscillations,
the
thresholds
have
a
small
hysteresis.
When
the
Min
threshold
is
hit,
the
Min
output
goes
high.
When
Min
or
Max
outputs
are
activated,
OK
signal
goes
off
(low).
When
OK
is
active,
neither
Min
nor
Max
could
be
active.
The
thresholds
are
only
active
when
the
object
is
inside
range.
For
easy
of
first
use,
the
thresholds
are
factory
default
set
to
the
range
limits.
The
thresholds
are
sampled
with
the
internal
CPU
processing
clock
rate
of
30
kHz;
this
is
equal
to
a
reaction
time
of
0.03
msec.
R
R
e
e
p
p
e
e
a
a
t
t
a
a
b
b
i
i
l
l
i
i
t
t
y
y
Other
than
mechanical
systems
the
optical
sensors
do
not
have
a
hysteresis
or
problems
with
repeatability.
Accuracy
is
limited
by
surface
condition
and
system
noise.
