GBS Elektronik MCA-527 - Manual (Page 44)

MCA527
3.2.17 MCA527 Setup Examples for Use With Different Detectors
This table shall just give an overview of possible settings useful with the MCA527. It is far
from being complete. For actual settings with your detector, see the detectors manual.
Table 12: Parameters for different detectors
Ty
p
e
M
o
d
e
l
M
a
n
u
fa
c
tu
re
r
H
V
[
V
]
12
V
-1
2
V
2
4V
-2
4
V
In
p
u
t
P
o
la
ri
ty
C
h
a
n
n
e
ls
S
h
a
p
in
g
T
im
e
[
µ
s
]
F
la
tt
o
p
T
im
e
[
µ
s
]
CdZnTe SDP/Z/60 Ritec +300 x x - - neg 1024 0.8 0.7
CdZnTe SDP/Z/20 Ritec +500 x x - - neg 1024 0.8 0.7
CdZnTe CZT500 Ritec +600 x x - - pos 1024 0.8 0.7
NaI Scintiblock Crismatec +500 pos 512 0.2 1.6
NaI 25825 Scionix +550 x x - - pos 512 0.2 1.6
NaI 40*40 Amcrys-h -800 x x pos 512 0.2 1.6
CsI Sc1010 Eurorad - x x - - neg 256 1
HPGe GMX-20190-S Ortec -3000 x x x x neg 4096 4 0.8
HPGe GEM 15-190 Ortec +3000 x x x x pos 4096 4
HPGe GR 2018 Canberra -3000 neg 4096 4
HPGe GL 0310 Canberra -2000 x x x - neg 4096 2
Si planar 7865S Ortec -1000 neg 4096
HPGe EGC 30-190R Eurisys -3000 pos 4096 4
HPGe EGPC 25-185 Eurisys +2000 neg 4096 4
Table 13: Further settings, optimized for different count rates,as example a coaxial HPGe
shaping
time
flat
top
trigger
filter
Base line
restorer
gain PZC
low count rate (<4kcps),
optimization for best resolution and
dynamic range. 4µs 0.9µs -101 16 high coarse gain,
small fine gain
(0.5...1)
general purpose, medium count
rates 4-20kcps 2µs 0.8µs 10-201 8
high count rate and throughput,
input >20kcps, 1µs 0.7µs 1-21 4 lower coarse gain
to avoid overrange adjustment
critical!
•
Pile up rejection should be always on, except there is a preamplifier signal with
overshoot and the pile up rejector rejects everything.
•
Jitter correction should be always off, its an experimental feature to improve
resolution.
•
LF rejection should be used if there is a problem with low frequency noise (e. g.
50Hz) microphonics (machinery nearby running) or similar. If using this, increase
shaping time by factor 3 at the same time.
•
Input polarity setting depends on detector; if no spectrum can be seen change this;
check with oscilloscope mode.
•
PZC should be always adjusted
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