XIA provides all support equipment necessary
to operate DXP-2X and DGF4C
modules as well as the multi-element detectors and preamplifiers
from a single equipment crate. This solution eliminates ground
loops and unwanted electronic noise pickup. XIA also sells desktop
DXP and DGF
models that interface directly to a PC, and that provide preamplifier
power and bias voltage for single-element detectors.
The following CAMAC products are available
for purchase:
The CMC-L is an
11-slot mini CAMAC equipment crate.
The JSCC-73A-F
is a CAMAC SCSI controller.
The Power
Distribution Module (PDM) conditions and monitors CAMAC supply
voltages for use as preamplifier supplies.
The CHQxxx
is a CAMAC 0-2kV detector bias supply, manufactured by ISEG.
We're asked this question often enough. At
issue are the power supplies included with most equipment crates.
Other crate systems, eg. VME, tend to assume a digital environment,
and to a large extent enforce it by including inexpensive switching
power supplies that introduce high frequency electronic noise.
While it is true that some CAMAC crate supplies are equally noisy,
we have found several well-designed CAMAC brands and models that
work quite nicely.
A related issue is ground loops. Conventional
detector systems typically include a shaping amplifier, an MCA,
preamplifier and detector power supplies, and any number of gating
or timing modules. Unless carefully orchestrated, even a system
comprised of individually healthy components will display unwanted
pickup due to ground loops and stray coupling. Much of the problem
is taken care of in DXP and DGF systems inherently, as the shaping
amplifier, MCA and timing modules have already been reduced to a
single printed circuit card. Power supplies for the detector(s)
and preamplifiers must also be considered. Each additional connection
introduces a potential source of noise, particularly when long cables
are not carefully routed.
If possible, we strongly recommend limiting
all detector signal, communications and power connections to a single
instrumentation chassis. The total cost is very competitive, especially
for systems with many channels. Contact
XIA for pricing and other CAMAC information.
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