Eberline ESP-1 - Page 25

C. Selection of DT for Various Detectors:
(1)
1f
the
detector
was
not
purchased
with
the
ESP-1
and,
thus,
a
combined
calibration
data
sheet
is
not
available,
use
the
nominal
value
for
the
particular
detector
which
is
given in Section V, "Maintenance," 11292-A36.
(2)
To
increase
the
value
of
DT,
simultaneously
press
RESET
and
+.
To
decrease
the
value
of
DT,
simultaneously
press
RESET and
-.
(3)
For
a
detailed
discussion
of
DT
consult
section
V.A.,
"Calibration".
CAUTION
If you do change detectors, the calibration constant (CC)
and the dead time (DT) must be changed. Use the
procedures just described in section ILE., steps 3 and 4.
5. Setting the High Voltage for the Detector of Choice
CAUTION
Do not press any of the keys! The high voltage is not
changed from the top of the instrument. Proceed as
follows:
a.
Selection
of
High
Voltage
for
detectors
which
were
purchased
from
the
factory
with
the
instrument:
If
a
detector
was
purchased
from
the
factory
with
the
instrument,
the
operating
high
voltage
will
already
be
set
at
the
factory
for
this
detector,
and
the
following
section
may
be
bypassed
until
a
different
type
of
detector
is
to
be
used
with
the
instrument.
b. Selection of High Voltage of Various Detectors:
(1)
If
the
calibration
data
sheet
supplied
with
the
detector
is
available,
use
the
recommended
operating
high
voltage
which
is
given
there.
(2)
If
the
calibration
sheet
supplied
with
the
detector
is
not
available,
use
the
following
general
recommendations:
(a)
Geiger-type
detectors
(HP-190,
HP-260,
HP-270):
use
900
volts
(exception:
HP-
290
requires
550
volts).
(b)
Scintillation
and
proportional
detectors:
determine
the
plateau
response
of
the
detector
according
to
the
procedure
described
in
section
V.A.3.c.
and
figure
5-1,
and
select
an
operating
voltage
value
which
is
75
volts
above
the
beginning
of
the
plateau.
ESP1.MAN/February
1992
2-13