O
PERATION
M
ANUAL
P
ROMO
®
2000
P
ALAS
®
G
MB
H,
M
ARCH
2010,
V
ERSION
V001032010
18
Each
measurement
range
of
each
sensor
has
to
be
calibrated
by
its
own.
A
calibration
is
done
by
changing
the
photomultiplier
voltage
(DAC)
and
the
particle
velocity.
For
this
purpose,
two
dia
‐
grams
are
shown:
the
raw
data
distribution
(amplitudes
of
the
signals
in
256
raw
data
channels)
and
the
time
distribution
(length
of
the
signals).
With
the
raw
data
distribution
the
amplification
of
the
photomultiplier
can
be
checked,
with
the
time
distribution
the
velocity.
The
automatically
measured
channel
of
the
maxi
‐
mum
of
the
raw
data
distribution.
By
pressing
this
button,
the
voltage
for
the
pho
‐
tomultiplier
amplification
is
changed.
Here
you
can
change
the
position
of
the
red
cross
within
the
time
distribution.
The
maximum
is
not
found
automatically.
You
have
to
move
the
red
cross
into
the
right
maximum.
The
position
is
calculated
into
the
velocity
(measured
velocity)
by
using
the
geometric
proportions
of
the
measuring
volume.
By
pressing
this
button
you
change
the
velocity
calibration
for
the
current
sensor
and
measurement
range.
This
box
shows
you
the
material
to
be
used
for
cali
‐
bration
(here:
CalDust
1100).
Behind
the
dust
mate
‐
rial
a
number
(here:
130)
gives
you
the
so
‐
called
target
channel
for
the
raw
data
distribution.
You
can
also
see
the
value
for
the
measured
velocity
(related
to
the
position
of
the
red
cross
within
the
time
distribution)
and
the
present
velocity
(cali
‐
brated
velocity)
that
is
currently
used.
4.1
How
to
calibrate
your
sensor
for
the
selected
measurement
range
with
CalDust1100?
To
run
the
calibration
procedure,
connect
a
flexible
tube
to
the
aerosol
inlet
of
the
sensor.
Hold
the
free
end
of
the
flexible
tube
into
the
opening
of
the
supplied
CalDust
1100
container
after
shaking
the
container
to
loosen
the
particles
and
make
them
air
‐
borne
inside
the
container.
By
doing
so
you
provide
that
the
air
which
is
sucked
into
the
sensor
is
primarily
filled
with
particles
of
a
diameter
of
0.85
µm.
You
must
not
shake
too
strongly
as
you
must
not
have
more
than
10
%
coincident
signals
during
the
calibration
procedure.
Calibration
of
the
photomultiplier
(PM)
amplification:
The
objective
that
has
to
be
achieved
hereby
is
to
adjust
the
PM
‐
amplification
(DAC)
so
that
the
target
channel
of
calibration
matches
the
measured
maximum
of
the
raw
data
distribution.
In
‐
creasing/decreasing
the
PM
‐
amplification
by
increasing/decreasing
the
voltage
will
move
the
measured
maximum
(channel
of
calibration)
upward/downward.