Eberline ESP-1 - Page 37

PREFIX [value]
+ = USE/- = NO
The
"PREFIX"
is
the
value
by
which
the
base
unit
is
multiplied
to
provide
a
more
convenient
unit
of
actual
measurement.
Four
are
available:
(NONE) no prefix
u micro (x 105)
m milli (x 10?)
k kilo (x 10°)
If
the
prefix
displayed
is
not
the
desired
value,
then
press
"-"
to
reject
it
and
call
the
next
choice
to
be
displayed.
When
the
desired
prefix
is
displayed,
press
"+"
to
select
it.
The
setting
of
radiation
units
to
be
measured
would
now
be
complete.
An
example
of
this
would
be:
PREFIX
BASE
SUFFIX
m
R/
h
(milli)
(roentgen)
/
(hour)
The
units
may
be
selected
in
any
combination
of
prefix/base/suffix.
Press
the
"+"
switch
to
select
the
prefix
and
prepare
the
instrument
for
the
setting
of
parameters,
(i.e.
calibration).
Section
V,
"Maintenance,"
provides
nominal
values
of
the
following
parameters
as
they
apply
to
the
particular
detector
being
used.
The
display
will
read:
CC z [numerical value]
RATE METER READING
The
calibration
constant
(CC)
is
the
number
used
to
convert
the
detector
count
rate
to
the
displayed
base
unit
previously
selected.
Specifically,
the
displayed
rate
meter
reading
is
arrived
at
by
dividing
the
counts
per
second
(from
the
detector)
by
CC
and
then
scaling
the
result
based
on
the
selected
prefix
and
suffix.
To
increase
the
value
of
CC,
press
RESET
and
"+"
simultaneously.
To
decrease
the
value
of
CC
press
RESET
and
"-"
simultaneously.
Keep
in
mind
that
increasing
or
decreasing
CC
will
have
the
inverse
affect
on
the
rate
meter
reading.
With
the
rate
meter
reading
always
displayed
on
the
bottom
line,
the
changing
value
of
CC
and
its
effect
on
the
reading
is
immediately
noticeable.
When
the
desired
value
of
CC
is
displayed,
press
"+."
The
display
will
read:
DT
(SEC)
[numerical
value]
RATE
METER
READING
This
parameter
is
the
dead
time
(DT)
of
the
detector,
in
seconds.
It is
used
to
correct
for
coincidence
loss
from
the
detector,
yielding
a
more
linear
response
to
the
radiation
field
being
measured.
An
extra
decade
of
range
is
possible
from
most
detectors
due
to
the
DT
correction.
Typical
values
of
DT
are
in
microseconds
(x
10%).
To
increase
the
value
of
DT,
press
RESET
and
"«"
simultaneously.
To
decrease
the
value
of
DT,
press
RESET
and
"-"
simultaneously.
NOTE
For
a
more
detailed
explanation
on
setting
"CC"
and
"DT,"
as
well
as
nominal
values
for
various
detectors,
refer
to
section
V.A.
When
the
desired
value
of
DT
is
displayed,
press
"+."
The
display
will
read:
ESPI.MAN/February
1992